|
| 3511 | Oak extract manufacturing | |
| 3219 | Oakum picking | |
| 3219 | Oakum willowing | |
| 3319 | Oar, wooden, manufacturing | |
| 3116 | Oat groating | |
| 1110 | Oat growing | |
| 3620 | Obscured glass manufacturing | |
| 9331 | Obstetrician, private practice | |
| 9331 | Occupational therapeutist, own account | |
| 7121 | Ocean borne transport | |
| 1301 | Ocean fishing | |
| 3841 | Ocean liner, passenger, construction | |
| 7121 | Ocean liver, passenger | |
| 3511 | Ochre manufacturing | |
| 9331 | Oculist, private practice | |
| 8310 | Office building operation | |
| 3320 | Office cabinet, except primarily of metal, manufacturing | |
| 3812 | Office cabinet, primarily of metal, manufacturing | |
| 8330 | Office duplicating machinery rental | |
| 3320 | Office fixture, except primarily of metal, manufacturing | |
| 3812 | Office fixture, primarily of metal, manufacturing | |
| 8330 | Office furniture rental, not to households | |
| 3320 | Office furniture, except primarily of metal, manufacturing | |
| 3812 | Office furniture, primarily of metal, manufacturing | |
| 3812 | Office lamp manufacturing | |
| 3320 | Office table, except primarily of metal, manufacturing | |
| 3812 | Office table, primarily of metal, manufacturing | |
| 3411 | Offset paper manufacturing | |
| 3420 | Offset printing | |
| 6200 | Oil and gas filling station | |
| 2200 | Oil and gas well, cutting casings, tubes and rods, except contract services | |
| 2200 | Oil and gas well, pulling casings, tubes and rods, except contract services | |
| 8330 | Oil and natural gas rigs and dredges rental | |
| 3819 | Oil burner manufacturing | |
| 2200 | Oil extracting from shale or sand, operations not including refining | |
| 5000 | Oil field diamond drilling, contract services | |
| 8330 | Oil field equipment rental service | |
| 3824 | Oil field machinery manufacturing | |
| 3843 | Oil filter, motor vehicle, manufacturing | |
| 1110 | Oil kernel growing | |
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