| 5150 | Oil well supply houses, wholesale | |
| 1120 | Oil well surveying, contract services (except seismographic) | |
| 1110 | Oil well, crude, conventional | |
| 5139 | Oil, bath, wholesale | |
| 1532 | Oil, corn, crude and refined, made by wet-milling corn | |
| 1514 | Oil, fish and marine animal, manufacturing | |
| 5141 | Oil, fuel, wholesale | |
| 5141 | Oil, furnace, wholesale | |
| 5141 | Oil, lubricating, wholesale | |
| 1514 | Oil, olive, made from purchased oils | |
| 1514 | Oil, vegetable stearin, made from purchased oils | |
| 1514 | Oil, vegetable, made in oilseed crushing mills | |
| 5149 | Oil, waste, wholesale | |
| 2320 | Oil-based additives, made from refined petroleum | |
| 2422 | Oil-based paints, manufacturing | |
| 2422 | Oil-based stains, manufacturing | |
| 1729 | Oilcloth, manufacturing | |
| 7414 | Oilfield crew supervisor | |
| 3312 | Oilfield instrumentation repair service | |
| 2924 | Oilfield machinery (drilling and pumping), maintenance | |
| 1120 | Oilfield services | |
| 1810 | Oiling (i.e., waterproofing) purchased clothing | |
| 1729 | Oiling (i.e., waterproofing) purchased textile fabrics | |
| 9000 | Oiling and salting roads for dust control | |
| 2429 | Oils (e.g., cutting, lubricating), synthetic, manufacturing | |
| 2320 | Oils (e.g., fuel, lubricating and illuminating), made in petroleum refineries | |
| 5149 | Oils (except cooking), animal and vegetable, wholesale | |
| 5149 | Oils and greases, animal or vegetable, wholesale | |
| 5141 | Oils and greases, lubricating, wholesale | |
| 5122 | Oils, cooking and salad, wholesale | |
| 1514 | Oils, cooking, made from purchased fats and oils | |
| 2429 | Oils, essential, manufacturing | |
| 2411 | Oils, made by distillation of coal tar | |
| 2320 | Oils, petroleum lubricating, made from refined petroleum | |
| 2320 | Oils, petroleum lubricating, re-refining used | |
| 2429 | Oils, soluble (i.e., textile finishing assistants), manufacturing | |
| 2423 | Oils, vegetable and animal, medicinal, uncompounded, manufacturing | |
| 2411 | Oils, wood, made by distillation of wood | |
| 5121 | Oilseed cake and meal, wholesale | |
| 2925 | Oilseed crushing and extracting machinery, manufacturing | |