| ODC | | Miscellaneous Manufacturing Industries | 74046 |
| ODD | | Perfumes, Cosmetics & Other Toilet Preparations | 1907085 |
| ODFL | | Trucking (No Local) | 878927 |
| ODOT | | - | 1857629 |
| ODP | | Retail-Miscellaneous Shopping Goods Stores | 800240 |
| ODRS | | Sporting & Athletic Goods, NEC | 1610718 |
| ODV | | Gold and Silver Ores | 1431852 |
| ODYS | | Services-Computer Integrated Systems Design | 1577445 |
| ODYY | | Surgical & Medical Instruments & Apparatus | 1626644 |
| OEC | | Miscellaneous Chemical Products | 1609804 |
| OESX | | Electric Lighting & Wiring Equipment | 1409375 |
| OFAL | | Services-Engineering Services | 2036307 |
| OFG | | State Commercial Banks | 1030469 |
| OFIX | | Surgical & Medical Instruments & Apparatus | 884624 |
| OFLX | | Heating Equip, Except Elec & Warm Air; & Plumbing Fixtures | 1317945 |
| OFRM | | Food and Kindred Products | 1696556 |
| OFS | | - | 1487918 |
| OGE | | Electric Services | 1021635 |
| OGEN | | Pharmaceutical Preparations | 1174940 |
| OGI | | Pharmaceutical Preparations | 1620737 |
| OGN | | Pharmaceutical Preparations | 1821825 |
| OGS | | Natural Gas Distribution | 1587732 |
| OHCFF | | - | 1735514 |
| OHI | | Real Estate Investment Trusts | 888491 |
| OI | | Glass Containers | 812074 |
| OIA | | - | 835333 |
| OII | | Oil & Gas Field Services, NEC | 73756 |
| OILCF | | Drilling Oil & Gas Wells | 1922639 |
| OIS | | Oil & Gas Field Machinery & Equipment | 1121484 |
| OKE | | Natural Gas Transmisison & Distribution | 1039684 |
| OKLO | | Electric Services | 1849056 |
| OKMN | | Crude Petroleum & Natural Gas | 1848334 |
| OKTA | | Services-Prepackaged Software | 1660134 |
| OKUR | | Pharmaceutical Preparations | 1637715 |
| OKYO | | Biological Products, (No Diagnostic Substances) | 1849296 |
| OLB | | Services-Business Services, NEC | 1314196 |
| OLED | | Electronic Components & Accessories | 1005284 |
| OLLI | | Retail-Variety Stores | 1639300 |
| OLMA | | Pharmaceutical Preparations | 1750284 |
| OLN | | Chemicals & Allied Products | 74303 |
| OLP | | Real Estate Investment Trusts | 712770 |
| OLPX | | Perfumes, Cosmetics & Other Toilet Preparations | 1868726 |
| OM | | Electromedical & Electrotherapeutic Apparatus | 1484612 |
| OMAB | | Airports, Flying Fields & Airport Terminal Services | 1378239 |
| OMC | | Services-Advertising Agencies | 29989 |
| OMCC | | Short-Term Business Credit Institutions | 1000045 |
| OMCL | | Electronic Computers | 926326 |
| OMDA | | Services-Health Services | 1611115 |
| OMER | | Pharmaceutical Preparations | 1285819 |
| OMEX | | Water Transportation | 798528 |
