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Page Last Modified: September 19, 2000
| I- | IC | ID | IG | IL | IM | IN | IO | IR | IS | IT | IV |
| Index entry | NAICS Code | U.S. NAICS Title |
|---|---|---|
| In-built thermostats, filled system and bimetal types, manufacturing | 334512 | Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use |
| In-home sales of merchandise, direct selling | 454390 | Other Direct Selling Establishments |
| In-vitro diagnostic substances manufacturing | 325413 | In-Vitro Diagnostic Substance Manufacturing |
| In-vivo diagnostic substances manufacturing | 325412 | Pharmaceutical Preparation Manufacturing |
| Incandescent filament lamp bulbs, complete, manufacturing | 335110 | Electric Lamp Bulb and Part Manufacturing |
| Incense manufacturing | 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing |
| Incinerator control systems, residential and commercial-type, manufacturing | 334512 | Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use |
| Incinerators (except precast concrete) manufacturing | 333994 | Industrial Process Furnace and Oven Manufacturing |
| Incinerators, hazardous waste, operating | 562211 | Hazardous Waste Treatment and Disposal |
| Incinerators, nonhazardous solid waste | 562213 | Solid Waste Combustors and Incinerators |
| Incinerators, precast concrete, manufacturing | 327390 | Other Concrete Product Manufacturing |
| Incinerators, small, construction contractors | 235950 | Building Equipment and Other Machinery Installation Contractors |
| Income tax compilation services | 541213 | Tax Preparation Services |
| Income tax return preparation services | 541213 | Tax Preparation Services |
| Incoming mail handling equipment (e.g., opening, scanning, sorting) manufacturing | 333313 | Office Machinery Manufacturing |
| Incubators, infant, manufacturing | 339113 | Surgical Appliance and Supplies Manufacturing |
| Incubators, laboratory-type, manufacturing | 339111 | Laboratory Apparatus and Furniture Manufacturing |
| Incubators, poultry, manufacturing | 333111 | Farm Machinery and Equipment Manufacturing |
| Indelible inks manufacturing | 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing |
| Independent Artists, Writers, and Performers | 7115 | Independent Artists, Writers, and Performers |
| Independent pilot, air (except owner-operators) | 488190 | Other Support Activities for Air Transportation |
| Independent truck driver (except owner-operators) | 488490 | Other Support Activities for Road Transportation |
| Indexing, rotary tables (i.e., a machine tool accessory) manufacturing | 333515 | Cutting Tool and Machine Tool Accessory Manufacturing |
| India inks manufacturing | 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing |
| Indian affairs programs, government | 921190 | Other General Government Support |
| Indicating instruments, electric, manufacturing | 334515 | Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals |
| Indicator testers, turntable, manufacturing | 334519 | Other Measuring and Controlling Device Manufacturing |
| Indicators, industrial process control-type, manufacturing | 334513 | Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variable |
| Indium chloride manufacturing | 325188 | All Other Basic Inorganic Chemical Manufacturing |
| Individual and Family Services | 6241 | Individual and Family Services |
| Individual and family social services, multi-purpose | 624190 | Other Individual and Family Services |
| Individuals investing in financial contracts on own account | 523910 | Miscellaneous Intermediation |
| Indoor display advertising services | 541850 | Display Advertising |
| Indoor play areas | 713120 | Amusement Arcades |
| Induction heating equipment, industrial process-type, manufacturing | 333994 | Industrial Process Furnace and Oven Manufacturing |
| Inductors, electronic component-type (e.g., chokes, coils, transformers), manufacturing | 334416 | Electronic Coil, Transformer, and Other Inductor Manufacturing |
| Industrial and manufacturing building construction contractors | 233310 | Manufacturing and Industrial Building Construction |
| Industrial and manufacturing building construction management firms | 233310 | Manufacturing and Industrial Building Construction |
| Industrial associations | 813910 | Business Associations |
| Industrial banks (i.e., known as), depository | 522190 | Other Depository Credit Intermediation |
| Industrial banks (i.e., known as), nondepository | 522298 | All Other Nondepository Credit Intermediation |
| Industrial belting reinforcement, cord and fabric, manufacturing | 314992 | Tire Cord and Tire Fabric Mills |
| Industrial building construction, general construction contractors | 233310 | Manufacturing and Industrial Building Construction |
| Industrial building rental or leasing | 531120 | Lessors of Nonresidential Buildings (except Miniwarehouses) |
| Industrial caters (i.e., providing food services on a contractural arrangement (except single event base)) | 722310 | Food Service Contractors |
| Industrial chemicals wholesaling | 422690 | Other Chemical and Allied Products Wholesalers |
| Industrial containers wholesaling | 421840 | Industrial Supplies Wholesalers |
| Industrial controls (e.g., push button, selector, and pilot switches, manufacturing | 335314 | Relay and Industrial Control Manufacturing |
| Industrial controls, electrical, wholesaling | 421610 | Electrical Apparatus and Equipment, Wiring Supplies, and Construction Material Wholesalers |
| Industrial design consulting services | 541420 | Industrial Design Services |
| Industrial design licensing | 533110 | Lessors of Nonfinancial Intangible Assets (except Copyrighted Works) |
| Industrial design services | 541420 | Industrial Design Services |
| Industrial development program administration | 926110 | Administration of General Economic Programs |
| Industrial engineering services | 541330 | Engineering Services |
| Industrial equipment and machinery repair and maintenance services | 811310 | Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance |
| Industrial garments, men's and boys', cut and sew apparel contractors | 315211 | Men's and Boys' Cut and Sew Apparel Contractors |
| Industrial garments, men's and boys', cut and sewn from purchased fabric (except apparel contractors) | 315225 | Men's and Boys' Cut and Sew Work Clothing Manufacturing |
| Industrial garments, women's and girls', cut and sew apparel contractors | 315212 | Women's, Girls', and Infants' Cut and Sew Apparel Contractors |
| Industrial garments, women's, misses', and girls', cut and sewn from purchased fabric (except apparel contractors) | 315239 | Women's and Girls' Cut and Sew Other Outerwear Manufacturing |
| Industrial gases manufacturing | 325120 | Industrial Gas Manufacturing |
| Industrial gases wholesaling | 422690 | Other Chemical and Allied Products Wholesalers |
| Industrial glassware and glass products, pressed or blown, made in glass making plants | 327212 | Other Pressed and Blown Glass and Glassware Manufacturing |
| Industrial glassware made from purchased glass | 327215 | Glass Product Manufacturing Made of Purchased Glass |
| Industrial incinerator construction contractors | 234930 | Industrial Nonbuilding Structure Construction |
| Industrial labor unions | 813930 | Labor Unions and Similar Labor Organizations |
| Industrial land use planning services | 541320 | Landscape Architectural Services |
| Industrial launderers | 812332 | Industrial Launderers |
| Industrial lighting fixtures, electric, manufacturing | 335122 | Commercial, Industrial, and Institutional Electric Lighting Fixture Manufacturing |
| Industrial loan companies, nondepository | 522298 | All Other Nondepository Credit Intermediation |
| Industrial locomotives and parts manufacturing | 336510 | Railroad Rolling Stock Manufacturing |
| Industrial machinery and equipment (except electrical) wholesaling | 421830 | Industrial Machinery and Equipment Wholesalers |
| Industrial Machinery Manufacturing | 3332 | Industrial Machinery Manufacturing |
| Industrial mercury lighting fixtures, electric, manufacturing | 335122 | Commercial, Industrial, and Institutional Electric Lighting Fixture Manufacturing |
| Industrial molds (except steel ingot) manufacturing | 333511 | Industrial Mold Manufacturing |
| Industrial molds, steel ingot, manufacturing | 331511 | Iron Foundries |
| Industrial nonbuilding construction management firms | 234930 | Industrial Nonbuilding Structure Construction |
| Industrial pattern manufacturing | 332997 | Industrial Pattern Manufacturing |
| Industrial plant appurtenance construction | 234930 | Industrial Nonbuilding Structure Construction |
| Industrial plant construction, general construction contractors | 233310 | Manufacturing and Industrial Building Construction |
| Industrial process control instruments manufacturing | 334513 | Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variable |
| Industrial product finishes and coatings (i.e., paint) manufacturing | 325510 | Paint and Coating Manufacturing |
| Industrial research and development laboratories or services | 541710 | Research and Development in the Physical, Engineering, and Life Sciences |
| Industrial safety devices (e.g., eye shields, face shields, first-aid kits) wholesaling | 421450 | Medical, Dental, and Hospital Equipment and Supplies Wholesalers |
| Industrial salt manufacturing | 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing |
| Industrial salt wholesaling | 422690 | Other Chemical and Allied Products Wholesalers |
| Industrial sand beneficiating (e.g., screening, washing) | 212322 | Industrial Sand Mining |
| Industrial sand sandpits and dredging | 212322 | Industrial Sand Mining |
| Industrial scales manufacturing | 333997 | Scale and Balance (except Laboratory) Manufacturing |
| Industrial structures, construction (except building) | 234930 | Industrial Nonbuilding Structure Construction |
| Industrial supplies (except disposable plastics, paper) wholesaling | 421840 | Industrial Supplies Wholesalers |
| Industrial supplies, disposable plastics, paper, wholesaling | 422130 | Industrial and Personal Service Paper Wholesalers |
| Industrial testing laboratories or services | 541380 | Testing Laboratories |
| Industrial therapists' offices (e.g., centers, clinics) | 621340 | Offices of Physical, Occupational and Speech Therapists, and Audiologists |
| Industrial truck (e.g., forklifts) repair and maintenance services | 811310 | Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance |
| Industrial truck rental or leasing | 532490 | Other Commercial and Industrial Machinery and Equipment Rental and Leasing |
| Industrial trucks and tractors manufacturing | 333924 | Industrial Truck, Tractor, Trailer, and Stacker Machinery Manufacturing |
| Industrial trucks, tractors, or trailers wholesaling | 421830 | Industrial Machinery and Equipment Wholesalers |
| Industrial uniform supply services | 812332 | Industrial Launderers |
| Industrial wastes to be reclaimed wholesaling | 421930 | Recyclable Material Wholesalers |
| Inedible products (e.g., hides, skins, pulled wool, wool grease) produced in slaughtering plants | 311611 | Animal (except Poultry) Slaughtering |
| Inertial navigation systems, aeronautical, manufacturing | 334511 | Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing |
| Infant and junior food canning | 311422 | Specialty Canning |
| Infant cereals, dry, manufacturing | 311230 | Breakfast Cereal Manufacturing |
| Infant day care centers | 624410 | Child Day Care Services |
| Infant day care services | 624410 | Child Day Care Services |
| Infant incubators manufacturing | 339113 | Surgical Appliance and Supplies Manufacturing |
| Infant's formulas manufacturing | 311514 | Dry, Condensed, and Evaporated Dairy Product Manufacturing |
| Infant's shoes (except plastics, rubber), manufacturing | 316219 | Other Footwear Manufacturing |
| Infants water resistant outerwear cut and sewn from purchased fabric (except apparel contractors) | 315291 | Infants' Cut and Sew Apparel Manufacturing |
| Infants' apparel cut and sewn from purchased fabric (except apparel contractors) | 315291 | Infants' Cut and Sew Apparel Manufacturing |
| Infants' clothing wholesaling | 422330 | Women's, Children's, and Infants' Clothing and Accessories Wholesalers |
| Infants' cut and sew apparel contractors | 315212 | Women's, Girls', and Infants' Cut and Sew Apparel Contractors |
| Information | 51 | Information |
| Information access services, on-line | 514191 | On-Line Information Services |
| Information management computer systems integration design services | 541512 | Computer Systems Design Services |
| Information search services, on a contract or fee basis | 514199 | All Other Information Services |
| Information Services | 5141 | Information Services |
| Information Services and Data Processing Services | 514 | Information Services and Data Processing Services |
| Infrared analytical instruments, laboratory-type, manufacturing | 334516 | Analytical Laboratory Instrument Manufacturing |
| Infrared homing systems, aeronautical, manufacturing | 334511 | Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing |
| Infrared instruments, industrial process-type, manufacturing | 334513 | Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variable |
| Infrared lamp bulbs manufacturing | 335110 | Electric Lamp Bulb and Part Manufacturing |
| Infrared lamp fixtures manufacturing | 335129 | Other Lighting Equipment Manufacturing |
| Infrared ovens, industrial, manufacturing | 333994 | Industrial Process Furnace and Oven Manufacturing |
| Infrared sensors, solid-state, manufacturing | 334413 | Semiconductor and Related Device Manufacturing |
| Infusion therapy centers and clinics, outpatient | 621498 | All Other Outpatient Care Centers |
| Ingot made by rolling purchased aluminum | 331319 | Other Aluminum Rolling and Drawing |
| Ingot made in steel mills | 331111 | Iron and Steel Mills |
| Ingot, aluminum, made in integrated secondary smelting and rolling mills | 331319 | Other Aluminum Rolling and Drawing |
| Ingot, nonferrous metals (except aluminum, copper), secondary smelting and refining | 331492 | Secondary Smelting, Refining, and Alloying of Nonferrous Metal (except Copper and Aluminum) |
| Ingot, primary aluminium, manufacturing | 331312 | Primary Aluminum Production |
| Ingot, primary, nonferrous metals (except aluminum, copper), manufacturing | 331419 | Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum) |
| Ingots (except precious) wholesaling | 421510 | Metal Service Centers and Offices |
| Ingots, precious, wholesaling | 421940 | Jewelry, Watch, Precious Stone, and Precious Metal Wholesalers |
| Inhalation therapists' offices (e.g., centers, clinics) | 621399 | Offices of All Other Miscellaneous Health Practitioners |
| Inhalation therapy equipment manufacturing | 339112 | Surgical and Medical Instrument Manufacturing |
| Inhalators, surgical and medical, manufacturing | 339112 | Surgical and Medical Instrument Manufacturing |
| Inhibitors (e.g., corrosion, oxidation, polymerization) manufacturing | 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing |
| Injection molding machinery for plastics manufacturing | 333220 | Plastics and Rubber Industry Machinery Manufacturing |
| Ink eradicators manufacturing | 325612 | Polish and Other Sanitation Good Manufacturing |
| Ink, writing, wholesaling | 422120 | Stationery and Office Supplies Wholesalers |
| Inked ribbons manufacturing | 339944 | Carbon Paper and Inked Ribbon Manufacturing |
| Inked ribbons wholesaling | 422120 | Stationery and Office Supplies Wholesalers |
| Inkjet cartridges manufacturing | 325910 | Printing Ink Manufacturing |
| Inkjet inks manufacturing | 325910 | Printing Ink Manufacturing |
| Inks, printing, manufacturing | 325910 | Printing Ink Manufacturing |
| Inks, printing, wholesaling | 421840 | Industrial Supplies Wholesalers |
| Inks, writing, manufacturing | 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing |
| Inland Water Transportation | 4832 | Inland Water Transportation |
| Inner soles, leather, manufacturing | 316999 | All Other Leather Good Manufacturing |
| Inner tubes manufacturing | 326211 | Tire Manufacturing (except Retreading) |
| Innerspring cushions manufacturing | 337910 | Mattress Manufacturing |
| Inns, bed and breakfast | 721191 | Bed-and-Breakfast Inns |
| Inorganic chemicals wholesaling | 422690 | Other Chemical and Allied Products Wholesalers |
| Inorganic pigments (except bone black, carbon black, lamp black) manufacturing | 325131 | Inorganic Dye and Pigment Manufacturing |
| Input/output equipment, computer (except terminals), manufacturing | 334119 | Other Computer Peripheral Equipment Manufacturing |
| Insect control for crops | 115112 | Soil Preparation, Planting, and Cultivating |
| Insect lamps, electric, manufacturing | 335129 | Other Lighting Equipment Manufacturing |
| Insect screening made from purchased wire | 332618 | Other Fabricated Wire Product Manufacturing |
| Insecticides manufacturing | 325320 | Pesticide and Other Agricultural Chemical Manufacturing |
| Inserts, cutting tool, manufacturing | 333515 | Cutting Tool and Machine Tool Accessory Manufacturing |
| Inspection bureaus, building | 541350 | Building Inspection Services |
| Inspection for labor standards | 926150 | Regulation, Licensing, and Inspection of Miscellaneous Commercial Sectors |
| Inspection or weighing services, truck transportation | 488490 | Other Support Activities for Road Transportation |
| Inspection services, aircraft | 488190 | Other Support Activities for Air Transportation |
| Inspection services, building or home | 541350 | Building Inspection Services |
| Installation of machinery and other industrial equipment construction contractors | 235950 | Building Equipment and Other Machinery Installation Contractors |
| Installing production equipment at the oil or gas field on a contract basis | 213112 | Support Activities for Oil and Gas Operations |
| Installment sales financing | 522220 | Sales Financing |
| Instant coffee manufacturing | 311920 | Coffee and Tea Manufacturing |
| Instant hot cereals manufacturing | 311230 | Breakfast Cereal Manufacturing |
| Instant printing (i.e., quick printing) | 323114 | Quick Printing |
| Instant tea manufacturing | 311920 | Coffee and Tea Manufacturing |
| Institutional and commercial building construction management firms | 233320 | Commercial and Institutional Building Construction |
| Institutional building construction | 233320 | Commercial and Institutional Building Construction |
| Institutional furniture manufacturing | 337127 | Institutional Furniture Manufacturing |
| Institutional lighting fixtures, electric, manufacturing | 335122 | Commercial, Industrial, and Institutional Electric Lighting Fixture Manufacturing |
| Instruction -- see type of training | ****** | |
| Instructional video production | 512110 | Motion Picture and Video Production |
| Instrument control panels (i.e., assembling purchased gauges), automotive, truck, and bus, manufacturing | 336322 | Other Motor Vehicle Electrical and Electronic Equipment Manufacturing |
| Instrument landing system instrumentation, airborne or airport, manufacturing | 334511 | Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing |
| Instrument lenses manufacturing | 333314 | Optical Instrument and Lens Manufacturing |
| Instrument panels, assembling gauges made in the same establishment | 334514 | Totalizing Fluid Meter and Counting Device Manufacturing |
| Instrument shunts manufacturing | 334515 | Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals |
| Instrument springs, precision (except clock, watch), manufacturing | 332612 | Spring (Light Gauge) Manufacturing |
| Instrument transformers (except complete instruments) for metering or protective relaying use manufacturing | 335311 | Power, Distribution, and Specialty Transformer Manufacturing |
| Instrumentation for reactor controls, auxiliary, manufacturing | 334519 | Other Measuring and Controlling Device Manufacturing |
| Instruments (except electrical) (e.g., controlling, indicating, recording) wholesaling | 421830 | Industrial Machinery and Equipment Wholesalers |
| Instruments for industrial process control manufacturing | 334513 | Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variable |
| Instruments for measuring electrical quantities manufacturing | 334515 | Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals |
| Instruments, aeronautical, manufacturing | 334511 | Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing |
| Instruments, electric (i.e., testing electrical characteristics), manufacturing | 334515 | Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals |
| Instruments, mechanical microsurgical, manufacturing | 339112 | Surgical and Medical Instrument Manufacturing |
| Instruments, musical, manufacturing | 339992 | Musical Instrument Manufacturing |
| Instruments, musical, wholesaling | 421990 | Other Miscellaneous Durable Goods Wholesalers |
| Instruments, professional and scientific, wholesaling | 421490 | Other Professional Equipment and Supplies Wholesalers |
| Insulated wire or cable made from purchased copper in wire drawing plants | 331422 | Copper Wire (except Mechanical) Drawing |
| Insulated wire or cable made in aluminum wire drawing plants | 331319 | Other Aluminum Rolling and Drawing |
| Insulated wire or cable wholesaling | 421610 | Electrical Apparatus and Equipment, Wiring Supplies, and Construction Material Wholesalers |
| Insulated wire or cable, copper, made in integrated secondary smelting and drawing plants | 331422 | Copper Wire (except Mechanical) Drawing |
| Insulating batts, fills, or blankets made from purchased paper | 322299 | All Other Converted Paper Product Manufacturing |
| Insulating batts, fills, or blankets, fiberglass, manufacturing | 327993 | Mineral Wool Manufacturing |
| Insulating firebrick and shapes, clay, manufacturing | 327124 | Clay Refractory Manufacturing |
| Insulating glass, sealed units, made from purchased glass | 327215 | Glass Product Manufacturing Made of Purchased Glass |
| Insulating glass, sealed units, made in glass making plants | 327211 | Flat Glass Manufacturing |
| Insulating materials, cork, manufacturing | 321999 | All Other Miscellaneous Wood Product Manufacturing |
| Insulating oils manufacturing | 325998 | All Other Miscellaneous Chemical Product and Preparation Manufacturing |
| Insulating pipes and boilers construction contractors | 235990 | All Other Special Trade Contractors |
| Insulating purchased wire | 335929 | Other Communication and Energy Wire Manufacturing |
| Insulation and cushioning, foam plastics (except polystrene), manufacturing | 326150 | Urethane and Other Foam Product (except Polystyrene) Manufacturing |
| Insulation and cushioning, polystyrene foam plastics, manufacturing | 326140 | Polystyrene Foam Product Manufacturing |
| Insulation board, cellular fiber or hard pressed wood, manufacturing | 321219 | Reconstituted Wood Product Manufacturing |
| Insulation construction contractors | 235420 | Drywall, Plastering, Acoustical, and Insulation Contractors |
| Insulation materials wholesaling | 421330 | Roofing, Siding, and Insulation Material Wholesalers |
| Insulation of pipes and boilers construction contractors | 235990 | All Other Special Trade Contractors |
| Insulators, electrical (except glass, porcelain), manufacturing | 335932 | Noncurrent-Carrying Wiring Device Manufacturing |
| Insulators, electrical porcelain, manufacturing | 327113 | Porcelain Electrical Supply Manufacturing |
| Insulators, electrical, glass, made from purchased glass | 327215 | Glass Product Manufacturing Made of Purchased Glass |
| Insulators, electrical, glass, made in glass making plants | 327212 | Other Pressed and Blown Glass and Glassware Manufacturing |
| Insulators, electrical, wholesaling | 421610 | Electrical Apparatus and Equipment, Wiring Supplies, and Construction Material Wholesalers |
| Insulin preparations manufacturing | 325412 | Pharmaceutical Preparation Manufacturing |
| Insulin, uncompounded, manufacturing | 325411 | Medicinal and Botanical Manufacturing |
| Insurance advisory services | 524298 | All Other Insurance Related Activities |
| Insurance agencies | 524210 | Insurance Agencies and Brokerages |
| Insurance and Employee Benefit Funds | 5251 | Insurance and Employee Benefit Funds |
| Insurance brokerages | 524210 | Insurance Agencies and Brokerages |
| Insurance building rental or leasing | 531120 | Lessors of Nonresidential Buildings (except Miniwarehouses) |
| Insurance Carriers | 5241 | Insurance Carriers |
| Insurance Carriers and Related Activities | 524 | Insurance Carriers and Related Activities |
| Insurance carriers, disability, direct | 524113 | Direct Life Insurance Carriers |
| Insurance carriers, fidelity, direct | 524126 | Direct Property and Casualty Insurance Carriers |
| Insurance carriers, health, direct | 524114 | Direct Health and Medical Insurance Carriers |
| Insurance carriers, life, direct | 524113 | Direct Life Insurance Carriers |
| Insurance carriers, property and casualty, direct | 524126 | Direct Property and Casualty Insurance Carriers |
| Insurance carriers, surety, direct | 524126 | Direct Property and Casualty Insurance Carriers |
| Insurance carriers, title, direct | 524127 | Direct Title Insurance Carriers |
| Insurance claims adjusting | 524291 | Claims Adjusting |
| Insurance claims investigation services | 524291 | Claims Adjusting |
| Insurance claims processing services, third party | 524292 | Third Party Administration of Insurance and Pension Funds |
| Insurance commissions, government | 926150 | Regulation, Licensing, and Inspection of Miscellaneous Commercial Sectors |
| Insurance coverage consulting services | 524298 | All Other Insurance Related Activities |
| Insurance fund, third party administrative services (except claims adjusting only) | 524292 | Third Party Administration of Insurance and Pension Funds |
| Insurance investigation services (except claims investigation) | 524298 | All Other Insurance Related Activities |
| Insurance loss prevention services | 524298 | All Other Insurance Related Activities |
| Insurance plan administrative services (except claims adjusting only), third-party | 524292 | Third Party Administration of Insurance and Pension Funds |
| Insurance rate making services | 524298 | All Other Insurance Related Activities |
| Insurance reporting services | 524298 | All Other Insurance Related Activities |
| Insurance settlement offices | 524291 | Claims Adjusting |
| Insurance underwriters laboratories and standards services | 524298 | All Other Insurance Related Activities |
| Insurance underwriting, disability, direct | 524113 | Direct Life Insurance Carriers |
| Insurance underwriting, health and medical, direct | 524114 | Direct Health and Medical Insurance Carriers |
| Insurance underwriting, life, direct | 524113 | Direct Life Insurance Carriers |
| Insurance underwriting, property and casualty, direct | 524126 | Direct Property and Casualty Insurance Carriers |
| Insurance underwriting, title, direct | 524127 | Direct Title Insurance Carriers |
| Insurers' associations | 813910 | Business Associations |
| Intaglio printing | 323111 | Commercial Gravure Printing |
| Integral horsepower electric motors manufacturing | 335312 | Motor and Generator Manufacturing |
| Integrated circuits wholesaling | 421690 | Other Electronic Parts and Equipment Wholesalers |
| Integrated microcircuits manufacturing | 334413 | Semiconductor and Related Device Manufacturing |
| Integrated record companies (i.e., releasing, promoting, distributing) | 512220 | Integrated Record Production/Distribution |
| Integrated record production and distribution | 512220 | Integrated Record Production/Distribution |
| Integrated-circuit testers manufacturing | 334515 | Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals |
| Integrating electricity meters manufacturing | 334515 | Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals |
| Integrating meters, nonelectric, manufacturing | 334514 | Totalizing Fluid Meter and Counting Device Manufacturing |
| Interactive museums | 712110 | Museums |
| Interceptor construction | 234910 | Water, Sewer, and Pipeline Construction |
| Intercity bus line operation | 485210 | Interurban and Rural Bus Transportation |
| Intercoastal freight transportation to and from domestic ports | 483113 | Coastal and Great Lakes Freight Transportation |
| Intercom systems and equipment manufacturing | 334290 | Other Communications Equipment Manufacturing |
| Intercooler shells manufacturing | 332410 | Power Boiler and Heat Exchanger Manufacturing |
| Intercostal transportation of passengers to and from domestic ports | 483114 | Coastal and Great Lakes Passenger Transportation |
| Interferometers manufacturing | 333314 | Optical Instrument and Lens Manufacturing |
| Interior decorating consultant services | 541410 | Interior Design Services |
| Interior decorating consulting services | 541410 | Interior Design Services |
| Interior design consulting services | 541410 | Interior Design Services |
| Interior design services | 541410 | Interior Design Services |
| Interior designer services | 541410 | Interior Design Services |
| Interlinings (e.g., belt loops, pockets) for suits, coats, and trousers, men's and boys', cut and sew apparel contracto | 315211 | Men's and Boys' Cut and Sew Apparel Contractors |
| Interlinings (e.g., belt loops, pockets) for suits, coats, skirts, and dresses, women's, girls' and infants', cut and s | 315212 | Women's, Girls', and Infants' Cut and Sew Apparel Contractors |
| Intermediate care facilities, mental retardation | 623210 | Residential Mental Retardation Facilities |
| Internal combustion engine analyzers (i.e., testing electrical characteristics) manufacturing | 334515 | Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals |
| Internal combustion engines (except aircraft, nondiesel automotive, nondiesel truck) manufacturing | 333618 | Other Engine Equipment Manufacturing |
| Internal combustion engines (except aircraft, nondiesel automotive, nondiesel truck) wholesaling | 421830 | Industrial Machinery and Equipment Wholesalers |
| Internal combustion engines, aircraft, manufacturing | 336412 | Aircraft Engine and Engine Parts Manufacturing |
| Internal combustion engines, automotive and truck gasoline, manufacturing | 336312 | Gasoline Engine and Engine Parts Manufacturing |
| Internal Revenue Service | 921130 | Public Finance Activities |
| International Monetary Fund | 928120 | International Affairs |
| International trade financing | 522293 | International Trade Financing |
| Internet access providers | 514191 | On-Line Information Services |
| Internet service providers (ISP) | 514191 | On-Line Information Services |
| Internists' offices (e.g., centers, clinics) | 621111 | Offices of Physicians (except Mental Health Specialists) |
| Internists' offices, veterinary | 541940 | Veterinary Services |
| Interpretation services, language | 541930 | Translation and Interpretation Services |
| Interpretive centers, nature | 712190 | Nature Parks and Other Similar Institutions |
| Interpretive dance companies | 711120 | Dance Companies |
| Interpretive dancers, independent | 711510 | Independent Artists, Writers, and Performers |
| Interstate bus line operation | 485210 | Interurban and Rural Bus Transportation |
| Interurban and Rural Bus Transportation | 4852 | Interurban and Rural Bus Transportation |
| Interurban bus line operation | 485210 | Interurban and Rural Bus Transportation |
| Intra ocular lenses manufacturing | 339113 | Surgical Appliance and Supplies Manufacturing |
| Intracoastal transportation of freight | 483211 | Inland Water Freight Transportation |
| Intracoastal transportation of passengers | 483212 | Inland Water Passenger Transportation |
| Intrauterine devices manufacturing | 339113 | Surgical Appliance and Supplies Manufacturing |
| Intravenous (IV) solution preparations manufacturing | 325412 | Pharmaceutical Preparation Manufacturing |
| Introduction services, social | 812990 | All Other Personal Services |
| Invalid equipment rental (i.e. home use) | 532291 | Home Health Equipment Rental |
| Inventory computing services | 561990 | All Other Support Services |
| Inventory planning and control management consulting services | 541614 | Process, Physical Distribution, and Logistics Consulting Services |
| Inventory taking services | 561990 | All Other Support Services |
| Invert sugar made from purchased raw cane sugar | 311312 | Cane Sugar Refining |
| Inverters, rotating electrical, manufacturing | 335312 | Motor and Generator Manufacturing |
| Inverters, solid-state, manufacturing | 335999 | All Other Miscellaneous Electrical Equipment and Component Manufacturing |
| Investigation and Security Services | 5616 | Investigation and Security Services |
| Investigation services (except credit), private | 561611 | Investigation Services |
| Investigation services, credit | 561450 | Credit Bureaus |
| Investigators, private | 561611 | Investigation Services |
| Investment advice consulting services, customized, fees paid by client | 523930 | Investment Advice |
| Investment advice counseling services, customized, fees paid by client | 523930 | Investment Advice |
| Investment advisory services, customized, fees paid by client | 523930 | Investment Advice |
| Investment banking | 523110 | Investment Banking and Securities Dealing |
| Investment castings, aluminum, unfinished, manufacturing | 331524 | Aluminum Foundries (except Die-Casting) |
| Investment castings, copper (except die-castings), unfinished manufacturing | 331525 | Copper Foundries (except Die-Casting) |
| Investment castings, nonferrous metal (except alumninum, copper), unfinished, manufacturing | 331528 | Other Nonferrous Foundries (except Die-Casting) |
| Investment castings, steel, unfinished, manufacturing | 331512 | Steel Investment Foundries |
| Investment clubs | 523910 | Miscellaneous Intermediation |
| Investment funds, closed-end | 525990 | Other Financial Vehicles |
| Investment funds, open-ended | 525910 | Open-End Investment Funds |
| I- | IC | ID | IG | IL | IM | IN | IO | IR | IS | IT | IV |