| SIC | C | Description | Quantity | DBG |
| 873306 | OBSERVATORIES | 66 | 79 | |
| C | OCCULT SUPPLIES | 112 | 134 | |
| 519985 | OCCULT SUPPLIES-WHOLESALE | 1 | 1 | |
| 804910 | OCCUPATIONAL HEALTH & SAFETY SERVICES | 548 | 658 | |
| Z | OCCUPATIONAL MEDICINE | 1865 | 2238 | |
| 804911 | OCCUPATIONAL THERAPISTS | 2818 | 3382 | |
| 873107 | OCEANOGRAPHERS | 49 | 59 | |
| 508815 | OCEANOGRAPHIC EQUIPMENT (WHOLESALE) | 77 | 92 | |
| 516938 | ODOR NEUTRALIZERS (WHOLESALE) | 78 | 94 | |
| 653102 | OFFICE & DESK SPACE-RENTAL | 2549 | 3059 | |
| 2542 | OFFICE & STORE FIXTURES EXCEPT WOOD | 1600 | 1920 | |
| 254201 | OFFICE & STORE FIXTURES-EXCEPT WOOD-MFRS | 793 | 952 | |
| 254198 | OFFICE & STORE FIXTURES-WOOD (MFRS) | 1506 | 1807 | |
| 651202 | OFFICE BUILDINGS & PARKS | 6652 | 7982 | |
| 5044 | OFFICE EQUIPMENT | 24234 | 29081 | |
| 504498 | OFFICE EQUIPMENT (WHOLESALE) | 204 | 245 | |
| 502112 | OFFICE FURNITURE & EQUIP-DEALERS (WHOL) | 10208 | 12250 | |
| 502122 | OFFICE FURNITURE & EQUIP-INSTLTN (WHOL) | 880 | 1056 | |
| 252204 | OFFICE FURNITURE & EQUIP-MFRS | 1316 | 1579 | |
| 735935 | OFFICE FURNITURE & EQUIP-RENTING | 869 | 1043 | |
| 764106 | OFFICE FURNITURE & EQUIP-RPR & REFINISH | 1091 | 1309 | |
| 593211 | OFFICE FURNITURE & EQUIP-USED | 1616 | 1939 | |
| 502113 | OFFICE FURNITURE & EQUIP-WHOLESALE | 1109 | 1331 | |
| 2522 | OFFICE FURNITURE EXCEPT WOOD | 1889 | 2267 | |
| 252298 | OFFICE FURNITURE-EXCEPT WOOD (MFRS) | 414 | 497 | |
| 3579 | OFFICE MACHINES NEC | 2903 | 3484 | |
| 357998 | OFFICE MACHINES NEC (MANUFACTURERS) | 457 | 548 | |
| 504621 | OFFICE PARTITIONS (WHOLESALE) | 28 | 34 | |
| A | OFFICE RECORDS DESTRUCTION | 248 | 298 | |
| 738983 | OFFICE RECORDS-STORAGE | 1482 | 1778 | |
| 154229 | OFFICE REMODELING | 59 | 71 | |
| 594301 | OFFICE SUPPLIES | 11870 | 14244 | |
| 511203 | OFFICE SUPPLIES-COMMERCIAL (WHOLESALE) | 21 | 25 | |
| 275916 | OFFICE SUPPLIES-MANUFACTURERS | 49 | 59 | |
| 511205 | OFFICE SUPPLIES-WHOLESALE | 324 | 389 | |
| 874122 | OFFICE SYSTEMS-SERVICES | 14 | 17 | |
| 8041 | OFFICES & CLINICS OF CHIROPRACTORS | 41188 | 49426 | |
| 8021 | OFFICES & CLINICS OF DENTISTS | 122137 | 146564 | |
| 803198 | OFFICES & CLINICS OF DOCTORS-OSTEOPATHY | 5 | 6 | |
| 8042 | OFFICES & CLINICS OF OPTOMETRISTS | 25212 | 30254 | |
| 8043 | OFFICES & CLINICS OF PODIATRISTS | 13930 | 16716 | |
| 6712 | OFFICES OF BANK HOLDING COMPANIES | 4395 | 5274 | |
| 8011 | OFFICES OF DOCTORS OF MEDICINE | 285066 | 342079 | |
| 8031 | OFFICES OF DOCTORS OF OSTEOPATHY | 5 | 6 | |
| 8049 | OFFICES OF HEALTH PRACTITIONERS NEC | 94231 | 113077 | |
| 804999 | OFFICES OF HEALTH PRACTITIONERS NEC | 40 | 48 | |
| 6719 | OFFICES OF HOLDING COMPANIES NEC | 2684 | 3221 | |
| 551107 | OFF-ROAD VEHICLES | 46 | 55 | |
| 279612 | OFFSET NEGATIVE & PLATE SERVICE | 12 | 14 | |
| 275208 | OFFSET REPRODUCTIONS | 231 | 277 | |
| 355501 | OFFSET REPRODUCTIONS EQUIP & SUPL (MFRS) | 10 | 12 | |
| 553142 | OFF-TRACK VEHICLES-PARTS SUPLS & ACCESS | 11 | 13 | |
| 138204 | OIL & GAS CONSULTANT | 127 | 152 | |
| 138203 | OIL & GAS EXPLORATION & DEVELOPMENT | 5307 | 6368 | |
| 13 | OIL & GAS EXTRACTION | 25977 | 31172 | |
| 1382 | OIL & GAS FIELD EXPLORATION SERVICES | 5702 | 6842 | |
| 3533 | OIL & GAS FIELD MACHINERY & EQUIPMENT | 1536 | 1843 | |
| 1389 | OIL & GAS FIELD SERVICES NEC | 12956 | 15547 | |
| 131101 | OIL & GAS PRODUCERS | 5655 | 6786 | |
| 353398 | OIL & GAS-FIELD MACHINERY/EQUIP (MFRS) | 924 | 1109 | |
| 138999 | OIL & GAS-FIELD SERVICES NEC | 166 | 199 | |
| 131104 | OIL & GAS-PRODUCTION | 220 | 264 | |
| 999924 | OIL & GREASE ABSORBENTS | 47 | ||
| 516909 | OIL ADDITIVES-DISTRIBUTORS | 137 | 164 | |
| 289915 | OIL ADDITIVES-MANUFACTURERS | 42 | 50 | |
| 621103 | OIL BROKERS | 210 | 252 | |
| 507408 | OIL BURNERS (WHOLESALE) | 1676 | 2011 | |
| 507411 | OIL BURNERS EQUIPMENT (WHOLESALE) | 60 | 72 | |
| 343304 | OIL BURNERS-MANUFACTURERS | 61 | 73 | |
| 769968 | OIL BURNERS-SERVICING | 1595 | 1914 | |
| 507421 | OIL BURNERS-SUPPLIES & PARTS (WHOLESALE) | 19 | 23 | |
| 131103 | OIL COMPANIES | 197 | 236 | |
| Y | OIL COMPANIES SUPPLIES | 16 | 19 | |
| 138922 | OIL EXTRACTION-DOWNHOLE | 1 | 1 | |
| 516978 | OIL FIELD CHEMICALS (WHOLESALE) | 33 | 40 | |
| 874846 | OIL FIELD CONSULTANTS | 96 | 115 | |
| 162930 | OIL FIELD CONTRACTORS | 21 | 25 | |
| 508428 | OIL FIELD EQUIPMENT (WHOLESALE) | 2161 | 2593 | |
| 353301 | OIL FIELD EQUIPMENT-MANUFACTURERS | 609 | 731 | |
| 138901 | OIL FIELD EQUIPMENT-REPAIRING | 312 | 374 | |
| 421314 | OIL FIELD HAULING | 720 | 864 | |
| 736308 | OIL FIELD LABOR CREWS | 17 | 20 | |
| 138924 | OIL FIELD MAINTENANCE | 24 | 29 | |
| 138905 | OIL FIELD SERVICE | 8850 | 10620 | |
| 138903 | OIL FIELD SPECIALTIES | 441 | 529 | |
| 508429 | OIL FIELD SUPPLIES (WHOLESALE) | 1756 | 2107 | |
| 421316 | OIL FIELD TRANSPORTATION SERVICE | 32 | 38 | |
| 508461 | OIL HANDLING EQUIPMENT (WHOLESALE) | 66 | 79 | |
| E | OIL HOLE COVERS | 1 | 1 | |
| 138904 | OIL INSPECTORS | 56 | 67 | |
| 621102 | OIL LAND LEASES | 1096 | 1315 | |
| 517212 | OIL MARKETERS & DISTRIBUTORS | 1582 | 1898 | |
| 131105 | OIL OPERATORS | 1443 | 1732 | |
| 517103 | OIL PRODUCTS (WHOLESALE) | 8 | 10 | |
| 651901 | OIL PROPERTIES | 353 | 424 | |
| 651902 | OIL PROPERTY MANAGEMENT | 152 | 182 | |
| 291111 | OIL RECOVERY-ENHANCED | 14 | 17 | |
| 291101 | OIL REFINERS (MANUFACTURERS) | 440 | 528 | |
| 2 | OIL REFINERS EQUIPMENT & SUPPLIES | 26 | 31 | |
| 138202 | OIL REPORTS | 80 | 96 | |
| 679202 | OIL ROYALTIES | 183 | 220 | |
| 6792 | OIL ROYALTY TRADERS | 437 | 524 | |
| 207403 | OIL SEEDS (MANUFACTURERS) | 6 | 7 | |
| 495908 | OIL SKIMMERS | 5 | 6 | |
| 519988 | OIL SPILL BARRIERS (WHOLESALE) | 7 | 8 | |
| 495904 | OIL SPILL CLEAN UP SERVICE | 172 | 206 | |
| Q | OIL SPILL CLEANUP EQUIPMENT & SUPPLIES | 36 | 43 | |
| 422608 | OIL STORAGE | 34 | 41 | |
| 516934 | OIL TREATING COMPOUNDS (WHOLESALE) | 102 | 122 | |
| 421315 | OIL TRUCKERS | 6 | 7 | |
| 138907 | OIL WELL CASING-PULLING | 34 | 41 | |
| 138906 | OIL WELL CEMENTING | 95 | 114 | |
| 138917 | OIL WELL CHEMICAL SERVICE | 1 | 1 | |
| 873426 | OIL WELL CORE ANALYSIS | 21 | 25 | |
| 138104 | OIL WELL DIRECTIONAL DRILLING | 48 | 58 | |
| 138102 | OIL WELL DRILLING | 721 | 865 | |
| 138908 | OIL WELL DRILLING MUD & ADDITIVES | 438 | 526 | |
| 289912 | OIL WELL DRILLING MUD & ADDITIVES-MFRS | 4 | 5 | |
| 516976 | OIL WELL DRILLING MUD & ADDITIVES-WHOL | 9 | 11 | |
| 735937 | OIL WELL EQUIPMENT & SUPPLIES-RENTING | 557 | 668 | |
| 508432 | OIL WELL EQUIPMENT & SUPPLIES-WHOL | 632 | 758 | |
| 508431 | OIL WELL FISHING TOOLS (WHOLESALE) | 154 | 185 | |
| 861106 | OIL WELL LOG LIBRARIES | 29 | 35 | |
| 138910 | OIL WELL LOGGING & PERFORATING | 367 | 440 | |
| 359914 | OIL WELL LOGGING/PERFORATING EQPT (MFRS) | 23 | 28 | |
| 138912 | OIL WELL SERVICES | 1967 | 2360 | |
| 138909 | OIL WELL SURVEYORS | 99 | 119 | |
| 138911 | OIL WELL TESTING | 59 | 71 | |
| 138923 | OIL WELL WIRE LINE SERVICE | 7 | 8 | |
| 598302 | OIL-BULK-DEALERS-RETAIL | 7 | 8 | |
| 517101 | OIL-BULK-DEALERS-WHOLESALE | 12 | 14 | |
| 679201 | OIL-CRUDE-PURCHASING | 250 | 300 | |
| 517222 | OILS & GREASES (WHOLESALE) | 7 | 8 | |
| 207705 | OILS-ANIMAL & FISH (MANUFACTURERS) | 12 | 14 | |
| 161112 | OILS-ASPHALT & ROAD | 18 | 22 | |
| 289921 | OILS-CORE (MANUFACTURERS) | 1 | 1 | |
| 999927 | OILS-CUTTING | 113 | ||
| 517224 | OILS-DIESEL (WHOLESALE) | 2 | 2 | |
| 514968 | OILS-EDIBLE (WHOLESALE) | 13 | 16 | |
| 516975 | OILS-EMULSION (WHOLESALE) | 2 | 2 | |
| 516933 | OILS-ESSENTIAL (WHOLESALE) | 143 | 172 | |
| 517206 | OILS-FUEL (WHOLESALE) | 14102 | 16922 | |
| 516949 | OILS-FUEL-TREATMENT COMPOUNDS (WHOL) | 29 | 35 | |
| 517220 | OILS-HYDRAULIC (WHOLESALE) | 25 | 30 | |
| 207904 | OILS-HYDROGENATED (MANUFACTURERS) | 2 | 2 | |
| 517213 | OILS-INDUSTRIAL (WHOLESALE) | 629 | 755 | |
| I | OILS-LINSEED | 1 | 1 | |
| 554107 | OILS-LUBRICATING-RETAIL | 735 | 882 | |
| 517214 | OILS-LUBRICATING-WHOLESALE | 4341 | 5209 | |
| 291110 | OILS-MINERAL (MANUFACTURERS) | 4 | 5 | |
| 284302 | OILS-PENETRATING (MANUFACTURERS) | 1 | 1 | |
| 517215 | OILS-PETROLEUM (WHOLESALE) | 2367 | 2840 | |
| 291104 | OILS-PETROLEUM-MANUFACTURERS | 245 | 294 | |
| 598303 | OILS-PETROLEUM-RETAIL | 326 | 391 | |
| 291102 | OILS-RE-REFINED (MANUFACTURERS) | 62 | 74 | |
| 161113 | OILS-ROAD | 19 | 23 | |
| 516962 | OILS-SYNTHETIC (WHOLESALE) | 41 | 49 | |
| 207905 | OILS-VEGETABLE (MANUFACTURERS) | 1 | 1 | |
| 514918 | OILS-VEGETABLE (WHOLESALE) | 77 | 92 | |
| 509308 | OILS-WASTE (WHOLESALE) | 641 | 769 | |
| O | OLDSMOBILE | 2887 | 3464 | |
| 207902 | OLIVE OIL (MANUFACTURERS) | 57 | 68 | |
| 514919 | OLIVES (WHOLESALE) | 37 | 44 | |
| O | OLIVETTI | 108 | 130 | |
| Y | OLYMPIA | 186 | 223 | |
| E | OLYMPIC | 896 | 1075 | |
| 961105 | OMBUDSMEN | 3 | ||
| 4 | ONAN | 518 | 622 | |
| 7 | ONAN | 14 | 17 | |
| 7 | ONAN | 336 | 403 | |
| O | ONCOLOGY | 4928 | 5914 | |
| 3 | ONE HOUR PHOTO | 249 | 299 | |
| 6 | ONE STOP MAIL SVCS | 4 | 5 | |
| 016102 | ONIONS | 3 | 4 | |
| 737505 | ONLINE SERVICES | 474 | 569 | |
| 519995 | ONYX & ONYX SPECIALTIES (WHOLESALE) | 5 | 6 | |
| 594418 | OPALS | 4 | 5 | |
| 792202 | OPERA COMPANIES | 210 | 252 | |
| 873135 | OPERATIONS RESEARCH | 18 | 22 | |
| 1531 | OPERATIVE BUILDERS | 82 | 98 | |
| 153198 | OPERATIVE BUILDERS | 82 | 98 | |
| 6513 | OPERATORS OF APARTMENT BUILDINGS | 99501 | 119401 | |
| 651398 | OPERATORS OF APARTMENT BUILDINGS | 118 | 142 | |
| 651498 | OPERATORS OF DWELLINGS OTHER THAN APTS | 26 | 31 | |
| 6512 | OPERATORS OF NONRESIDENTIAL BUILDINGS | 12158 | 14590 | |
| 651298 | OPERATORS OF NONRESIDENTIAL BUILDINGS | 251 | 301 | |
| 6514 | OPERATORS-DWELLINGS EXCEPT APARTMENTS | 457 | 548 | |
| 6515 | OPERATORS-RESIDENTIAL MOBILE HOME SITES | 15184 | 18221 | |
| 651598 | OPERATORS-RESIDENTIAL MOBILE HOME SITES | 11 | 13 | |
| 3851 | OPHTHALMIC GOODS | 1982 | 2378 | |
| 5048 | OPHTHALMIC GOODS | 2836 | 3403 | |
| 385198 | OPHTHALMIC GOODS-MANUFACTURERS | 441 | 529 | |
| 801111 | OPHTHALMOLOGISTS | 22 | 26 | |
| P | OPHTHALMOLOGY | 11627 | 13952 | |
| 504808 | OPTHALMIC INSTRUMENTS & EQUIP (WHOL) | 14 | 17 | |
| 369501 | OPTICAL DISK EQUIPMENT & SUPPLIES (MFRS) | 186 | 223 | |
| 873418 | OPTICAL ENGINEERS | 49 | 59 | |
| 504802 | OPTICAL EQUIPMENT MACHINERY/SUPLS (WHOL) | 426 | 511 | |
| 5995 | OPTICAL GOODS STORES | 32833 | 39400 | |
| 385103 | OPTICAL GOODS-MANUFACTURERS | 1159 | 1391 | |
| 599502 | OPTICAL GOODS-RETAIL | 16706 | 20047 | |
| 769910 | OPTICAL GOODS-SERVICE & REPAIR | 1092 | 1310 | |
| 504801 | OPTICAL GOODS-WHOLESALE | 2133 | 2560 | |
| 3827 | OPTICAL INSTRUMENTS & LENSES | 866 | 1039 | |
| 382798 | OPTICAL INSTRUMENTS & LENSES (MFRS) | 591 | 709 | |
| 385104 | OPTICAL LABORATORIES-MANUFACTURERS | 36 | 43 | |
| 504804 | OPTICAL LABORATORIES-WHOLESALE | 72 | 86 | |
| 385105 | OPTICAL SYSTEMS-MANUFACTURERS | 8 | 10 | |
| 599504 | OPTICIANS | 14548 | 17458 | |
| 385106 | OPTICIANS-MANUFACTURERS | 39 | 47 | |
| 504803 | OPTICIANS-WHOLESALE | 75 | 90 | |
| # | OPTION CARE | 36 | 43 | |
| 804201 | OPTOMETRISTS OD | 25181 | 30217 | |
| 804203 | OPTOMETRISTS OD-CHILDRENS VISION | 204 | 245 | |
| 804204 | OPTOMETRISTS OD-GERIATRIC OPTOMETRY | 43 | 52 | |
| 804205 | OPTOMETRISTS OD-THERAPY VISUAL TRAINING | 154 | 185 | |
| 809932 | OPTOMETRISTS REFERRAL & INFO SERVICE | 35 | 42 | |
| 5 | ORAL SURGERY | 5640 | 6768 | |
| 508301 | ORCHARD EQUIPMENT & SUPPLIES (WHOL) | 128 | 154 | |
| 072109 | ORCHARD SERVICE | 13 | 16 | |
| 017501 | ORCHARDS | 1028 | 1234 | |
| 792901 | ORCHESTRAS & BANDS | 2224 | 2669 | |
| 519315 | ORCHID GROWERS SUPPLIES (WHOLESALE) | 11 | 13 | |
| 3489 | ORDNANCE & ACCESSORIES NEC | 165 | 198 | |
| 348998 | ORDNANCE & ACCESSORIES NEC (MFRS) | 165 | 198 | |
| 109901 | ORE | 8 | 10 | |
| 508237 | ORE PROCESSING EQUIPMENT & SUPLS (WHOL) | 1 | 1 | |
| 809924 | ORGAN & TISSUE BANKS | 197 | 236 | |
| 549935 | ORGANIC FOODS & SERVICES | 31 | 37 | |
| 7041 | ORGANIZATION HOTELS ON MEMBERSHIP BASIS | 10 | 12 | |
| 704198 | ORGANIZATION HOTELS ON MEMBERSHIP BASIS | 10 | 12 | |
| 869903 | ORGANIZATIONS | 4304 | 5165 | |
| 738936 | ORGANIZING SERVICES-HOUSEHOLD & BUSINESS | 240 | 288 | |
| 573603 | ORGANS | 1083 | 1300 | |
| 393103 | ORGANS-MANUFACTURERS | 34 | 41 | |
| 573613 | ORGANS-SUPPLIES & PARTS | 6 | 7 | |
| 769912 | ORGANS-TUNING & REPAIRING | 660 | 792 | |
| 549916 | ORIENTAL FOOD PRODUCTS | 254 | 305 | |
| 549918 | ORIENTAL GOODS | 1130 | 1356 | |
| 229909 | ORIENTAL GOODS-MANUFACTURERS | 35 | 42 | |
| 519931 | ORIENTAL GOODS-WHOLESALE | 135 | 162 | |
| 508583 | ORIFICE FITTINGS (WHOLESALE) | 12 | 14 | |
| 0181 | ORNAMENTAL FLORICULTURE & NURSERY PRODS | 6632 | 7958 | |
| 018198 | ORNAMENTAL FLORICULTURE & NURSERY PRODS | 57 | 68 | |
| 344604 | ORNAMENTAL METAL WORK (MANUFACTURERS) | 2988 | 3586 | |
| 0783 | ORNAMENTAL SHRUB & TREE SERVICES | 17026 | 20431 | |
| 078398 | ORNAMENTAL SHRUB & TREE SERVICES | 13 | 16 | |
| 399925 | ORNAMENTS-MANUFACTURERS | 21 | 25 | |
| 836122 | ORPHANAGES | 3 | 4 | |
| 4 | ORTHODONTISTS | 11672 | 14006 | |
| 3842 | ORTHOPEDIC & PROSTHETIC APPLIANCES | 2578 | 3094 | |
| 599933 | ORTHOPEDIC APPLIANCES | 3504 | 4205 | |
| 384205 | ORTHOPEDIC APPLIANCES-MANUFACTURERS | 136 | 163 | |
| 504724 | ORTHOPEDIC APPLIANCES-WHOLESALE | 23 | 28 | |
| 384298 | ORTHOPEDIC PROSTHETIC/SRGCL APPL (MFRS) | 1820 | 2184 | |
| R | ORTHOPEDIC SURGERY | 9845 | 11814 | |
| 804951 | ORTHOPTISTS | 4 | 5 | |
| 804933 | ORTHOTHERAPISTS | 6 | 7 | |
| 804959 | ORTHOTICS | 3 | 4 | |
| A | ORTHOTISTS-PROSTHETISTS | 119 | 143 | |
| 2 | OSCO/SKAGGS | 542 | 650 | |
| 9 | OSTEOPATHY (D.O.) | 17854 | 21425 | |
| 512207 | OSTOMY EQUIPMENT & SUPPLIES (WHOLESALE) | 456 | 547 | |
| 027909 | OSTRICH BREEDERS | 101 | 121 | |
| O | OTHER MEDICAL SPECIALTY | 94 | 113 | |
| 6 | OTHER SPECIALTIES | 3413 | 4096 | |
| 1 | OTHER SPECIALTIES | 69 | 83 | |
| S | OTORHINOLARYNGOLOGY | 5892 | 7070 | |
| I | OUTBACK STEAKHOUSE | 332 | 398 | |
| 555109 | OUTBOARD MOTORS | 3450 | 4140 | |
| 555112 | OUTBOARD MOTORS-PARTS & REPAIR | 259 | 311 | |
| 735988 | OUTBOARD MOTORS-RENTING | 11 | 13 | |
| 769403 | OUTBOARD MOTORS-REPAIRING | 1595 | 1914 | |
| 555123 | OUTBOARD MOTORS-USED | 7 | 8 | |
| 7312 | OUTDOOR ADVERTISING SERVICES | 2639 | 3167 | |
| 526114 | OUTDOOR POWER EQUIPMENT | 27 | 32 | |
| 594151 | OUTFITTERS | 52 | 62 | |
| 701113 | OUTING FACILITIES | 29 | 35 | |
| 809303 | OUTPATIENT SERVICES | 157 | 188 | |
| 736110 | OUTPLACEMENT CONSULTANTS | 1533 | 1840 | |
| 703210 | OUTPOST CAMPS | 1 | 1 | |
| 734943 | OVEN CLEANING | 1 | 1 | |
| 572228 | OVENS | 8 | 10 | |
| 355605 | OVENS-BAKERS (MANUFACTURERS) | 21 | 25 | |
| 356701 | OVENS-INDUSTRIAL (MANUFACTURERS) | 258 | 310 | |
| 565106 | OVERALLS | 2 | 2 | |
| 232602 | OVERALLS-MANUFACTURERS | 11 | 13 | |
| 513616 | OVERALLS-WHOLESALE |