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| 7220 | Operating systems software, computer, publishing (including designing and developing), packaged | |
| 7414 | Operations research consulting services | |
| 4520 | Operative builders on own account | |
| 4520 | Operative builders on own account (except single residential) | |
| 7010 | Operators of "permanent" trailer sites | |
| 7010 | Operators of apartment buildings | |
| 7010 | Operators of apartment buildings (five or more housing units) | |
| 7010 | Operators of apartment hotels | |
| 7010 | Operators of commercial and industrial buildings | |
| 7010 | Operators of dwellings (four or fewer housing units) | |
| 7010 | Operators of non-residential buildings | |
| 7010 | Operators of residential buildings (four or fewer housing units) | |
| 7010 | Operators of residential hotels | |
| 7010 | Operators of retirement hotels | |
| 3311 | Ophthalmic (optical) examining and diagnostic equipment, manufacturing | |
| 2423 | Ophthalmic agents, uncompounded, manufacturing | |
| 5139 | Ophthalmic goods (except cameras), wholesale | |
| 3320 | Ophthalmic goods, manufacturing | |
| 5239 | Ophthalmic goods, retail and repair | |
| 3311 | Ophthalmic instruments and apparatus (except laser surgery), manufacturing | |
| 3320 | Ophthalmic lens grinding (except prescription), manufacturing | |
| 3320 | Ophthalmic lenses, manufacturing | |
| 8512 | Ophthalmologists' offices | |
| 3311 | Ophthalmometers and ophthalmoscopes, manufacturing | |
| 3311 | Ophthalmometers, manufacturing | |
| 3311 | Ophthalmoscopes, manufacturing | |
| 7413 | Opinion research services | |
| 2423 | Opium and opium derivatives (i.e., basic chemicals), manufacturing | |
| 3312 | Optical alignment and display instruments (except photographic), manufacturing | |
| 5110 | Optical and ophthalmic goods, wholesale agent | |
| 3000 | Optical disk drives, manufacturing | |
| 3320 | Optical fibres, strands, bundles and cables, unsheathed, made from purchased glass | |
| 2610 | Optical fibres, strands, bundles and cables, unsheathed, made in glass making plants | |
| 5139 | Optical goods (except cameras), wholesale | |
| 5239 | Optical goods stores, retail | |
| 3320 | Optical grinding service for the trade, manufacturing | |
| 3320 | Optical gun sighting and fire control equipment and instruments, manufacturing | |
| 2929 | Optical lens making and grinding machinery, manufacturing | |
| 3000 | Optical readers and scanners, manufacturing | |
| 2429 | Optical recording media, blank, manufacturing | |
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