The following data are from the Economic Census. All of these reports classify industries by the percent of output accounted for by the largest 4, 8, 20 and 50 companies. Only the manufacturing reports include the Herfindahl-Hirschman Index. Data for 2007, 2002 and 1997 are organized and classified by the North American Industry Classification System (NAICS). Data for 1992 and prior years are organized and classified by the Standard Industry Classification (SIC) system.
|NAICS||Sector title||2007 Economic Census||2002 Economic Census||1997 Economic Census|
|Link to FactFinder||Link to PDF||Link to FactFinder||Link to PDF|
|21||Mining||No concentration data available|
|23||Construction (none available)||No concentration data available|
|31-33||Manufacturing||Choose Value of Shipments or |
|Choose Value of Shipments or |
|48-49||Transportation and Warehousing|
|52||Finance and Insurance|
|53||Real Estate and Rental and Leasing|
|54||Professional, Scientific, and Technical Services|
|55||Management of Companies and Enterprises (none available)||No concentration data available|
|56||Administrative and Support and Waste Management and Remediation Services|
|62||Health Care and Social Assistance|
|71||Arts, Entertainment and Recreation|
|72||Accommodation and Foodservices|
|81||Other Services (except Public Administration)|
|Report #||Sector title||Link to PDF or text|
Concentration Ratios in Manufacturing
The following are extracted from "1992 Economic Census Establishment and Firm Size" reports.
1992 Census of Financial, Insurance and Real Estate Industries (1 Mb)
1992 Census of Retail Trade(.9 Mb)
1992 Census of Service Industries (4 Mb)
1992 Census of Transportation, Communications, and Utilities (2 Mb)
1992 Census of Wholesale Trade (4 Mb)
Concentration data are not available for mining and construction.
Manufacturing. This spreadsheet [xls], adapted from a file originally published on the 1992 Economic Census CD-ROM, contains data for Concentration Ratios in Manufacturing for each particular SIC-based industry back as far as the time series is unaffected by definitional changes, in some cases to 1947. Data for 1982 and earlier years for those SICs that changed in 1987 are available only in Concentration Ratios reports that may still be retained at major libraries.
Retail Trade, Wholesale Trade, and Service Industries. The 1987 Economic Census CD-ROM 1E includes a file for each of these three sectors with concentration data for 1987 only. The same data files are available for downloading (see ?C87/US/?C87S1.DBF). Data for earlier years are available only in printed reports that may still be retained at major libraries.
To order CD-ROMs, see http://www.census.gov/mp/www/cat/business_and_industry.