| SIC | Category | Count |
| 0181-01 | ORCHID GROWERS | 6649
|
| 1311-05 | OIL OPERATORS | 1317
|
| 1382-03 | OIL & GAS EXPLORATION & DEVELOPMENT | 5467
|
| 1389-03 | OIL FIELD SPECIALTIES | 416
|
| 1389-08 | OIL WELL DRILLING MUD & ADDITIVES | 407
|
| 1389-12 | OIL WELL SERVICES | 1738
|
| 2522-98 | OFFICE FURNITURE-EXCEPT WOOD (MFRS) | 394
|
| 2542-01 | OFFICE & STORE FIXTURES-EX WOOD (MFRS) | 795
|
| 2911-01 | OIL REFINERS (MANUFACTURERS) | 414
|
| 3446-04 | ORNAMENTAL METAL WORK (MANUFACTURERS) | 3066
|
| 3533-98 | OIL & GAS-FIELD MACHINERY/EQUIP (MFRS) | 914
|
| 3567-01 | OVENS-INDUSTRIAL (MANUFACTURERS) | 252
|
| 3827-98 | OPTICAL INSTRUMENTS & LENSES (MFRS) | 677
|
| 3851-03 | OPTICAL GOODS-MANUFACTURERS | 1207
|
| 4213-14 | OIL FIELD HAULING | 637
|
| 5021-12 | OFFICE FURNITURE & EQUIP-DEALERS (WHOL) | 11027
|
| 5021-22 | OFFICE FURNITURE & EQUIP-INSTITN (WHOL) | 1014
|
| 5048-02 | OPTICAL EQUIPMENT MACHINERY/SUPLS (WHOL) | 377
|
| 5084-28 | OIL FIELD EQUIPMENT (WHOLESALE) | 2198
|
| 5084-32 | OIL WELL EQUIPMENT & SUPPLIES-WHOL | 570
|
| 5112-05 | OFFICE SUPPLIES-WHOLESALE | 320
|
| 5169-20 | OXYGEN (WHOLESALE) | 6079
|
| 5172-12 | OIL MARKETERS & DISTRIBUTORS | 1454
|
| 5172-14 | OILS-LUBRICATING-WHOLESALE | 3989
|
| 5199-99 | OILS-LINSEED (WHOLESALE) | 456
|
| 5271-04 | OFFICES-MODULAR | 536
|
| 5541-07 | OILS-LUBRICATING-RETAIL | 664
|
| 5699-21 | OVERALL SUPPLY SERVICE | 1672
|
| 5736-03 | ORGANS | 1015
|
| 5943-01 | OFFICE SUPPLIES | 11798
|
| 5995-02 | OPTICAL GOODS-RETAIL | 18140
|
| 5999-31 | OUTLET STORES-RETAIL | 4111
|
| 6211-02 | OIL LAND LEASES | 1088
|
| 6512-02 | OFFICE BUILDINGS & PARKS | 6842
|
| 6519-01 | OIL PROPERTIES | 310
|
| 7312-01 | OUTDOOR ADVERTISING | 2578
|
| 7349-02 | OFFICE CLEANING | 35701
|
| 7359-37 | OIL WELL EQUIPMENT & SUPPLIES-RENTING | 577
|
| 7374-05 | OPTICAL SCANNING SERVICE | 904
|
| 7389-02 | OFFICE DESIGNERS | 32338
|
| 7389-83 | OFFICE RECORDS-STORAGE | 1146
|
| 7629-03 | OFFICE MACHINES-REPAIRING | 2366
|
| 7694-03 | OUTBOARD MOORS-REPAIRING | 1539
|
| 7699-12 | ORGANS-TUNING & REPAIRING | 611
|
| 7929-01 | ORCHESTRAS & BANDS | 2449
|
| 8042-01 | OPTOMETRISTS OD | 35252
|
| 8049-11 | OCCUPATIONAL THERAPISTS | 3248
|
| 8699-03 | ORGANIZATIONS | 3605
|