| 027105 | CHINCHILLAS | 9 | 11 | |
| 549917 | CHINESE FOOD PRODUCTS | 463 | 554 | |
| 203203 | CHINESE FOOD PRODUCTS-MANUFACTURERS | 3 | 4 | |
| 514944 | CHINESE FOODS-WHOLESALE | 1 | 1 | |
| 209602 | CHIPS (MANUFACTURERS) | 26 | 31 | |
| C | CHIROPRACTIC | 5337 | 6404 | |
| 804198 | CHIROPRACTIC CLINICS | 9 | 11 | |
| 809918 | CHIROPRACTIC DOCTOR INFO BUREAUS | 299 | 359 | |
| 804101 | CHIROPRACTORS DC | 41175 | 49410 | |
| 508745 | CHIROPRACTORS EQUIPMENT & SUPPLY (WHOL) | 212 | 254 | |
| 999942 | CHLORINATORS | 131 | ||
| 516946 | CHLORINE (WHOLESALE) | 87 | 104 | |
| 281203 | CHLORINE-MANUFACTURERS | 5 | 6 | |
| 514906 | CHOCOLATE & COCOA (WHOLESALE) | 391 | 469 | |
| 2066 | CHOCOLATE & COCOA PRODUCTS | 344 | 413 | |
| 206601 | CHOCOLATE & COCOA-MANUFACTURERS | 344 | 413 | |
| 864116 | CHORAL ORGANIZATIONS | 20 | 24 | |
| 792214 | CHOREOGRAPHERS | 57 | 68 | |
| F | CHRISTIAN | 19058 | 22870 | |
| 594211 | CHRISTIAN BOOKS & SUPPLIES-RETAIL | 6 | 7 | |
| 866122 | CHRISTIAN MINISTRIES | 84 | 101 | |
| 866105 | CHRISTIAN SCIENCE PRACTITIONERS | 574 | 689 | |
| 869906 | CHRISTIAN SCIENCE READING ROOMS | 424 | 509 | |
| 273202 | CHRISTIAN TRACTS (MANUFACTURERS) | 3 | 4 | |
| 599951 | CHRISTMAS LIGHTS & DECORATIONS | 1602 | 1922 | |
| 369903 | CHRISTMAS LIGHTS & DECORATIONS-MFRS | 36 | 43 | |
| 506343 | CHRISTMAS LIGHTS & DECORATIONS-WHOLESALE | 96 | 115 | |
| 594727 | CHRISTMAS STOCKINGS | 3 | 4 | |
| 081101 | CHRISTMAS TREE FARMS | 6 | 7 | |
| 526122 | CHRISTMAS TREES | 1449 | 1739 | |
| 399922 | CHRISTMAS TREES-ARTIFICIAL (MFRS) | 23 | 28 | |
| 519929 | CHRISTMAS TREES-WHOLESALE | 47 | 56 | |
| 347106 | CHROME (MANUFACTURERS) | 85 | 102 | |
| 516943 | CHROMIUM (WHOLESALE) | 31 | 37 | |
| 1 | CHRYSLER | 17 | 20 | |
| F | CHRYSLER-PLYMOUTH | 2879 | 3455 | |
| 5 | CHUCK E CHEESE PIZZA | 297 | 356 | |
| 581240 | CHUCK WAGON DINNERS | 1 | 1 | |
| 354505 | CHUCK-MANUFACTURERS | 6 | 7 | |
| K | CHUCKS | 42 | 50 | |
| 154225 | CHURCH BUILDERS | 17 | 20 | |
| 703209 | CHURCH CAMPS | 12 | 14 | |
| 615902 | CHURCH FINANCING | 15 | 18 | |
| 502118 | CHURCH FURNISHINGS (WHOLESALE) | 448 | 538 | |
| 253102 | CHURCH FURNITURE-MANUFACTURERS | 27 | 32 | |
| 866104 | CHURCH ORGANIZATIONS | 1995 | 2394 | |
| 599950 | CHURCH SUPPLIES | 2647 | 3176 | |
| 273102 | CHURCH SUPPLIES-MANUFACTURERS | 3 | 4 | |
| 519996 | CHURCH SUPPLIES-WHOLESALE | 4 | 5 | |
| 866125 | CHURCH SUPPORT SERVICE | 27 | 32 | |
| 569954 | CHURCH VESTMENTS | 8 | 10 | |
| 866107 | CHURCHES | 291798 | 350158 | |
| V | CHURCH-JESUS CHRIST-LDS | 6352 | 7622 | |
| 344307 | CHUTES-METAL PLATE-MANUFACTURERS | 32 | 38 | |
| 017502 | CIDER | 82 | 98 | |
| 017503 | CIDER MILLS | 45 | 54 | |
| 599303 | CIGAR & CIGARETTE LIGHTER FLUIDS | 2 | 2 | |
| 519928 | CIGAR & CIGARETTE LIGHTERS (WHOLESALE) | 141 | 169 | |
| 599301 | CIGAR CIGARETTE & TOBACCO DEALERS-RETAIL | 4441 | 5329 | |
| 519402 | CIGAR CIGARETTE & TOBACCO DEALERS-WHOL | 1855 | 2226 | |
| 212101 | CIGAR CIGARETTE & TOBACCO-MANUFACTURERS | 325 | 390 | |
| 355922 | CIGAR/CIGARETTE-MFRS EQUIP/SUPLS (MFRS) | 13 | 16 | |
| 262104 | CIGARETTE PAPERS & TUBES-MANUFACTURERS | 10 | 12 | |
| 2111 | CIGARETTES | 133 | 160 | |
| 211198 | CIGARETTES (MANUFACTURERS) | 133 | 160 | |
| 2121 | CIGARS | 581 | 697 | |
| 212198 | CIGARS (MANUFACTURERS) | 257 | 308 | |
| K | CIGNA | 1 | 1 | |
| K | CIGNA | 2 | 2 | |
| K | CIGNA | 385 | 462 | |
| 327102 | CINDER BLOCKS (MANUFACTURERS) | 21 | 25 | |
| 503224 | CINDERS (WHOLESALE) | 52 | 62 | |
| F | CIRCLE K | 2645 | 3174 | |
| F | CIRCLE K | 1586 | 1903 | |
| 367203 | CIRCUIT BOARD ASSEMBLY & REPAIRS (MFRS) | 134 | 161 | |
| 367202 | CIRCUIT BOARDS-MANUFACTURERS | 307 | 368 | |
| 506367 | CIRCUIT BREAKERS (WHOLESALE) | 104 | 125 | |
| 872114 | CIRCULATION AUDITORS | 4 | 5 | |
| 733107 | CIRCULATION BUILDERS | 7 | 8 | |
| 799982 | CIRCUS COMPANIES | 56 | 67 | |
| 178105 | CISTERN BUILDERS | 22 | 26 | |
| G | CITGO | 1814 | 2177 | |
| 829952 | CITIZENSHIP INSTRUCTION | 23 | 28 | |
| 514806 | CITRUS BUYERS | 17 | 20 | |
| 874886 | CITRUS CONSULTANTS | 10 | 12 | |
| 072303 | CITRUS FRUIT PROCESSING | 46 | 55 | |
| 017402 | CITRUS FRUIT PRODUCTS | 34 | 41 | |
| 203701 | CITRUS FRUIT PRODUCTS-MANUFACTURERS | 9 | 11 | |
| 514809 | CITRUS FRUIT PRODUCTS-WHOLESALE | 1 | 1 | |
| 0174 | CITRUS FRUITS | 188 | 226 | |
| 514807 | CITRUS FRUITS (WHOLESALE) | 224 | 269 | |
| 076201 | CITRUS GROVE SERVICE | 126 | 151 | |
| 076202 | CITRUS GROVES & MANAGEMENT | 105 | 126 | |
| 017401 | CITRUS GROWERS | 154 | 185 | |
| 076102 | CITRUS HARVESTING | 35 | 42 | |
| 421317 | CITRUS HAULING | 10 | 12 | |
| 072304 | CITRUS PACKERS | 41 | 49 | |
| 912112 | CITY & TOWN COUNCILS | 6 | ||
| 964104 | CITY GOVERNMENT-AGRICULTURAL PROGRAMS | 12 | ||
| 951204 | CITY GOVERNMENT-CONSERVATION DEPARTMENTS | 228 | ||
| 921104 | CITY GOVERNMENT-COURTS | 3314 | ||
| 606104 | CITY GOVERNMENT-CREDIT UNIONS | 111 | 133 | |
| 961104 | CITY GOVERNMENT-ECONOMIC PROGRAM ADM | 630 | ||
| 941104 | CITY GOVERNMENT-EDUCATION PROGRAMS | 207 | ||
| 951104 | CITY GOVERNMENT-ENVIRONMENTAL PROGRAMS | 1974 | ||
| 911104 | CITY GOVERNMENT-EXECUTIVE OFFICES | 14430 | ||
| 931104 | CITY GOVERNMENT-FINANCE & TAXATION | 6334 | ||
| 919904 | CITY GOVERNMENT-GENERAL OFFICES | 286 | ||
| 953104 | CITY GOVERNMENT-HOUSING PROGRAMS | 185 | ||
| 922204 | CITY GOVERNMENT-LEGAL COUNSEL | 775 | ||
| 823104 | CITY GOVERNMENT-LIBRARIES | 5833 | 7000 | |
| 965104 | CITY GOVERNMENT-LICENSING & INSPECTION | 351 | ||
| 971104 | CITY GOVERNMENT-NATIONAL SECURITY | 20 | ||
| 943104 | CITY GOVERNMENT-PUBLIC HEALTH PROGRAMS | 1404 | ||
| 944104 | CITY GOVERNMENT-SOCIAL & HUMAN RESOURCES | 1431 | ||
| 962104 | CITY GOVERNMENT-TRANSPORTATION PROGRAMS | 1360 | ||
| 953204 | CITY GOVERNMENT-URBAN PLANNING & DEV | 2689 | ||
| 945104 | CITY GOVERNMENT-VETERANS AFFAIRS ADMIN | 16 | ||
| 922304 | CITY GOVT-CORRECTIONAL INSTITUTIONS | 193 | ||
| 963104 | CITY GOVT-REGULATION/ADM-COMMS/UTILITIES | 7274 | ||
| 874824 | CITY REGIONAL & TOWN PLANNERS | 1409 | 1691 | |
| 864103 | CIVIC ORGANIZATIONS | 738 | 886 | |
| 8641 | CIVIC SOCIAL & FRATERNAL ASSOCIATIONS | 56866 | 68239 | |
| 922904 | CIVIL DEFENSE AGENCIES | 1567 | ||
| 922905 | CIVIL DEFENSE EQUIPMENT & SUPPLIES | 1 | ||
| H | CIVIL LAW | 8847 | 10616 | |
| 829953 | CIVIL SERVICE SCHOOLS | 3 | 4 | |
| 6 | CLAIMS OFFICES | 1 | 1 | |
| 6 | CLAIMS OFFICES | 1 | 1 | |
| 6 | CLAIMS OFFICES | 1 | 1 | |
| 6 | CLAIMS OFFICES | 1 | 1 | |
| 6 | CLAIMS OFFICES | 15 | 18 | |
| 6 | CLAIMS OFFICES | 1678 | 2014 | |
| 799922 | CLAMBAKES | 138 | 166 | |
| 508450 | CLAMPS (WHOLESALE) | 112 | 134 | |
| 342904 | CLAMPS-MANUFACTURERS | 24 | 29 | |
| 514929 | CLAMS (WHOLESALE) | 39 | 47 | |
| 0 | CLARK | 17 | 20 | |
| E | CLARK | 218 | 262 | |
| H | CLARK OIL | 526 | 631 | |
| 391107 | CLASS RINGS (MANUFACTURERS) | 17 | 20 | |
| 145901 | CLAY | 135 | 162 | |
| 1459 | CLAY CERAMIC & REFRACTORY MINERALS NEC | 207 | 248 | |
| 145999 | CLAY CERAMIC & REFRACTORY MINERALS NEC | 36 | 43 | |
| 571920 | CLAY PRODUCTS | 78 | 94 | |
| 325598 | CLAY REFACTORIES (MANUFACTURERS) | 207 | 248 | |
| 3255 | CLAY REFRACTORIES | 213 | 256 | |
| 503229 | CLAY-WHOLESALE | 3 | 4 | |
| 721805 | CLEAN ROOM FACILITIES | 64 | 77 | |
| 154103 | CLEAN ROOMS-INSTALLATION & EQUIPMENT | 227 | 272 | |
| 734937 | CLEAN ROOMS-SERVICE & CLEANING | 57 | 68 | |
| 721201 | CLEANERS | 50154 | 60185 | |
| 721977 | CLEANERS | 662 | 794 | |
| 508715 | CLEANERS & DYERS EQUIPMENT (WHOLESALE) | 468 | 562 | |
| 508717 | CLEANERS & DYERS SUPPLIES (WHOLESALE) | 245 | 294 | |
| 721604 | CLEANERS & DYERS-WHOLESALE | 9 | 11 | |
| 721701 | CLEANERS-UPHOLSTERY | 7885 | 9462 | |
| 721603 | CLEANERS-WHOLESALE | 113 | 136 | |
| 516925 | CLEANING COMPOUNDS (WHOLESALE) | 3278 | 3934 | |
| 284203 | CLEANING COMPOUNDS-MANUFACTURERS | 456 | 547 | |
| 734915 | CLEANING SERVICES-INDUSTRIAL | 1818 | 2182 | |
| 358914 | CLEANING SYSTEMS-PRESSURE CHEMICAL-MFRS | 20 | 24 | |
| 735968 | CLEANING SYSTEMS-PRESSURE/CHEM-RENTING | 35 | 42 | |
| 508719 | CLEANING SYSTS-PRESSURE CHEM/ETC (WHOL) | 2424 | 2909 | |
| 734918 | CLEANING-ROOF PATIO SIDEWALK & ETC | 221 | 265 | |
| 609909 | CLEARING HOUSES | 45 | 54 | |
| 866106 | CLERGY | 38756 | 46507 | |
| 801104 | CLINICS | 41375 | 49650 | |
| 738986 | CLIPPING BUREAUS | 147 | 176 | |
| 421225 | CLOCK MOVING SERVICE | 15 | 18 | |
| 509419 | CLOCKS-COMPONENTS (WHOLESALE) | 55 | 66 | |
| 594407 | CLOCKS-DEALERS | 1605 | 1926 | |
| 387301 | CLOCKS-MANUFACTURERS | 97 | 116 | |
| 506550 | CLOCKS-MASTER CNTRL/SIGNAL SYSTS (WHOL) | 4 | 5 | |
| 763103 | CLOCKS-REPAIRING & PARTS | 2454 | 2945 | |
| 509412 | CLOCKS-WHOLESALE | 150 | 180 | |
| 781916 | CLOSED CAPTIONING SERVICE | 16 | 19 | |
| 239210 | CLOSET ACCESSORIES-MANUFACTURERS | 9 | 11 | |
| 502309 | CLOSETS & CLOSET ACCESSORIES (WHOL) | 1318 | 1582 | |
| 152120 | CLOSETS-DESIGNING & ORGANIZING | 230 | 276 | |
| 308903 | CLOSURES-INDUSTRIAL-PROTECTIVE (MFRS) | 25 | 30 | |
| 738927 | CLOTH CUTTING | 250 | 300 | |
| 508484 | CLOTH CUTTING MACHINES (WHOLESALE) | 55 | 66 | |
| 355205 | CLOTH CUTTING MACHINES-MANUFACTURERS | 3 | 4 | |
| 223103 | CLOTH SHRINKING & SPONGING | 2 | 2 | |
| 232908 | CLOTHES & ACCESSORIES-MENS-MANUFACTURERS | 70 | 84 | |
| 233906 | CLOTHES & ACCESSORIES-WOMENS-MFRS | 167 | 200 | |
| 249908 | CLOTHES LINE EQUIP & SUPPLIES (MFRS) | 35 | 42 | |
| 533104 | CLOTHES POSTS | 2 | 2 | |
| 569980 | CLOTHING-ADAPTIVE | 11 | 13 | |
| 593235 | CLOTHING-COLLECTIBLE PERIOD & VINTAGE | 373 | 448 | |
| 729959 | CLOTHING-COORDINATING SERVICE | 10 | 12 | |
| 569934 | CLOTHING-CUSTOM MADE | 197 | 236 | |
| 569949 | CLOTHING-INSTITUTIONAL | 7 | 8 | |
| 233907 | CLOTHING-MANUFACTURERS | 1633 | 1960 | |
| 569923 | CLOTHING-PRINTING & LETTERING | 108 | 130 | |
| 565101 | CLOTHING-RETAIL | 16789 | 20147 | |
| 593205 | CLOTHING-USED | 5534 | 6641 | |
| 513628 | CLOTHING-WHOLESALE | 4080 | 4896 | |
| 569950 | CLOWN SUPPLIES | 2 | 2 | |
| 792907 | CLOWNS | 1158 | 1390 | |
| 729960 | CLUB MEMBERSHIP BROKERS | 2 | 2 | |
| 509150 | CLUB ROOM EQUIPMENT (WHOLESALE) | 27 | 32 | |
| 864108 | CLUBS | 28183 | 33820 | |
| 753918 | CLUTCHES | 2311 | 2773 | |
| 371422 | CLUTCHES-MANUFACTURERS | 17 | 20 | |
| E | CNA | 2 | 2 | |
| E | CNA | 1 | 1 | |
| E | CNA | 7 | 8 | |
| E | CNA | 2504 | 3005 | |
| A | COACH HOUSE | 138 | 166 | |
| 598902 | COAL & COKE-RETAIL | 1022 | 1226 | |
| 505201 | COAL & COKE-WHOLESALE | 436 | 523 | |
| 5052 | COAL & OTHER MINERALS & ORES | 951 | 1141 | |
| 505298 | COAL & OTHER MINERALS & ORES (WHOLESALE) | 69 | 83 | |
| 505203 | COAL BROKERS | 207 | 248 | |
| 421319 | COAL HAULING | 6 | 7 | |
| 651903 | COAL LAND LEASES | 4 | 5 | |
| 12 | COAL MINING | 1244 | 1493 | |
| 122102 | COAL MINING & SHIPPING | 1097 | 1316 | |
| 1241 | COAL MINING SERVICES | 44 | 53 | |
| 124198 | COAL MINING SERVICES | 44 |