| I- | IC | ID | IG | IL | IM | IN | IO | IR | IS | IT | IV |
| Index entry | NAICS Code | U.S. NAICS Title |
|---|---|---|
| Illuminated indoor lighting fixtures (e.g., directional, exit) manufacturing | 335122 | Commercial, Industrial, and Institutional Electric Lighting Fixture Manufacturing |
| Illustrators, independent commercial | 541430 | Graphic Design Services |
| Ilmenite ores mining and/or beneficiating | 212299 | All Other Metal Ore Mining |
| I- | IC | ID | IG | IL | IM | IN | IO | IR | IS | IT | IV |