| 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 | 53 | |
| 508215 | COAL PREPARATION-WASHING EQUIP (WHOL) | 11 | 13 | |
| 122101 | COAL WASHING | 31 | 37 | |
| 3 | COAST TO COAST | 601 | 721 | |
| 571946 | COASTERS-TABLE & SERVING | 2 | 2 | |
| 721303 | COAT & APRON SUPPLY SERVICE | 17 | 20 | |
| 239606 | COAT FRONTS (MANUFACTURERS) | 14 | 17 | |
| 735980 | COAT RACKS-RENTING | 1 | 1 | |
| 2672 | COATED & LAMINATED PAPER NEC | 2612 | 3134 | |
| 267298 | COATED & LAMINATED PAPER NEC (MFRS) | 861 | 1033 | |
| 513126 | COATED FABRICS (WHOLESALE) | 49 | 59 | |
| 2295 | COATED FABRICS-NOT RUBBERIZED | 362 | 434 | |
| 229598 | COATED FABRICS-NOT RUBBERIZED (MFRS) | 287 | 344 | |
| 3479 | COATING ENGRAVING & ALLIED SVCS NEC | 10342 | 12410 | |
| 347998 | COATING ENGRAVING/ALLIED SVCS NEC (MFRS) | 1801 | 2161 | |
| 8 | COATING MACHINERY | 2 | 2 | |
| 8 | COATING MACHINERY | 20 | 24 | |
| 347904 | COATINGS-PROTECTIVE (MANUFACTURERS) | 2959 | 3551 | |
| 347905 | COATINGS-PROTECTIVE-APPLICATORS (MFRS) | 194 | 233 | |
| 516956 | COATINGS-PROTECTIVE-WHOLESALE | 7 | 8 | |
| 347914 | COATINGS-VACUUM DEPOSITION (MFRS) | 63 | 76 | |
| 729951 | COATS OF ARMS | 33 | 40 | |
| A | COATS, SUITS, & VESTS | 10 | 12 | |
| A | COATS, SUITS, & VESTS | 11 | 13 | |
| 231104 | COATS-MANUFACTURERS | 47 | 56 | |
| 569951 | COATS-RETAIL | 16 | 19 | |
| 513718 | COATS-WHOLESALE | 43 | 52 | |
| 581303 | COCKTAIL LOUNGES | 16406 | 19687 | |
| 592101 | COCKTAIL MIXES | 47 | 56 | |
| 514958 | COCOA (WHOLESALE) | 3 | 4 | |
| 549929 | COCONUT PRODUCTS | 8 | 10 | |
| 737408 | CODES | 6 | 7 | |
| 549915 | COFFEE & TEA | 7362 | 8834 | |
| 209501 | COFFEE & TEA-MANUFACTURERS | 52 | 62 | |
| 514905 | COFFEE & TEA-WHOLESALE | 1209 | 1451 | |
| 596307 | COFFEE BREAK SERVICE & SUPPLIES | 3170 | 3804 | |
| 514945 | COFFEE BREAK SERVICE & SUPPLIES-WHOL | 1 | 1 | |
| 596308 | COFFEE BREWING DEVICES | 717 | 860 | |
| 363409 | COFFEE BREWING DEVICES-MANUFACTURERS | 12 | 14 | |
| 762932 | COFFEE BREWING DEVICES-REPAIRING | 57 | 68 | |
| 506425 | COFFEE BREWING DEVICES-WHOLESALE | 4 | 5 | |
| 209502 | COFFEE MILLS | 231 | 277 | |
| 549922 | COFFEE ROASTING & HANDLING EQUIPMENT | 80 | 96 | |
| 514908 | COFFEE ROASTING (WHOLESALE) | 403 | 484 | |
| 581228 | COFFEE SHOPS | 3003 | 3604 | |
| 493101 | CO-GENERATION | 19 | 23 | |
| 504915 | CO-GENERATION EQUIPMENT & SUPLS (WHOL) | 7 | 8 | |
| 331214 | COIL TUBING (MANUFACTURERS) | 6 | 7 | |
| 769401 | COIL WINDING | 92 | 110 | |
| 506362 | COIL WINDING MACHINERY (WHOLESALE) | 11 | 13 | |
| 507440 | COILS (WHOLESALE) | 38 | 46 | |
| 506520 | COILS-ELECTRIC (WHOLESALE) | 49 | 59 | |
| 506545 | COILS-FIN (WHOLESALE) | 28 | 34 | |
| 331216 | COILS-PIPE (MANUFACTURERS) | 5 | 6 | |
| 331215 | COILS-PLATE (MANUFACTURERS) | 6 | 7 | |
| 507429 | COILS-STEAM (WHOLESALE) | 6 | 7 | |
| 508759 | COIN & BILL CHANGING MACHINES-WHOLESALE | 1 | 1 | |
| 596204 | COIN & BILL CHANGING/HANDLING MACHINES | 142 | 170 | |
| I | COIN & BILL COUNTING SORTING & WRAP SVC | 86 | 103 | |
| 519998 | COIN BANKS (WHOLESALE) | 3 | 4 | |
| 599949 | COIN DEALERS SUPPLIES & ETC | 3499 | 4199 | |
| 357911 | COIN DEALERS SUPPLIES ETC-MANUFACTURERS | 1 | 1 | |
| 509426 | COIN DEALERS SUPPLIES-WHOLESALE | 6 | 7 | |
| 799304 | COIN MACHINES & SUPPLIES | 60 | 72 | |
| 504407 | COIN/BILL CNTNG SORTING/WRAP-MACH (WHOL) | 225 | 270 | |
| 346206 | COINED PARTS-METAL (MANUFACTURERS) | 3 | 4 | |
| 7993 | COIN-OPERATED AMUSEMENT DEVICES | 4754 | 5705 | |
| 7215 | COIN-OPERATED LAUNDRIES & CLEANING | 14464 | 17357 | |
| 346906 | COINS & TOKENS-MANUFACTURERS | 27 | 32 | |
| 346915 | COLD HEADING (MANUFACTURERS) | 2 | 2 | |
| 275907 | COLD TYPE COMPOSITION | 25 | 30 | |
| 279104 | COLD TYPE COMPOSITION-EQUIP/SUPLS (MFRS) | 5 | 6 | |
| 3316 | COLD-ROLLED STEEL SHEET STRIP & BARS | 576 | 691 | |
| 3 | COLDWELL BANKER | 2517 | 3020 | |
| 5 | COLEMAN | 359 | 431 | |
| 5 | COLEMAN | 155 | 186 | |
| 5 | COLEMAN | 866 | 1039 | |
| 5 | COLEMAN | 198 | 238 | |
| 5 | COLEMAN | 45 | 54 | |
| 265506 | COLLAPSIBLE TUBES (MANUFACTURERS) | 13 | 16 | |
| 384217 | COLLARS (MANUFACTURERS) | 2 | 2 | |
| 732304 | COLLATERAL CERTIFICATION & SUPERVISION | 2 | 2 | |
| G | COLLATING EQUIPMENT | 37 | 44 | |
| 733405 | COLLATING SERVICE | 36 | 43 | |
| 594705 | COLLECTIBLES | 10697 | 12836 | |
| 732201 | COLLECTION AGENCIES | 7406 | 8887 | |
| 732202 | COLLECTION SYSTEMS | 233 | 280 | |
| C | COLLEGE & UNIVERSITY | 1853 | 2224 | |
| 729974 | COLLEGE & UNIVERSITY PLACEMENT SERVICE | 10 | 12 | |
| 8221 | COLLEGES & UNIVERSITIES | 13175 | 15810 | |
| 354509 | COLLETS (MANUFACTURERS) | 12 | 14 | |
| 355915 | COLLOIDAL MILLS | 2 | 2 | |
| 809920 | COLONIC IRRIGATION | 400 | 480 | |
| 384218 | COLONIC THERAPY-APPARATUS & SUPLS (MFRS) | 10 | 12 | |
| 275211 | COLOR CARDS (MANUFACTURERS) | 31 | 37 | |
| 729921 | COLOR CONSULTANTS | 783 | 940 | |
| 523113 | COLOR MATCHING SERVICE & EQUIPMENT | 43 | 52 | |
| 275221 | COLOR SEPARATIONS-GRAPHIC ARTS (MFRS) | 2 | 2 | |
| 504311 | COLOR SPRTNS OFFSET PHOTO ETC-WHOL | 5 | 6 | |
| 275207 | COLOR SPRTNS-OFFSET PHOTO ENGRAVE (MFRS) | 1121 | 1345 | |
| 519804 | COLORS & PIGMENTS (WHOLESALE) | 178 | 214 | |
| 281602 | COLORS & PIGMENTS-MANUFACTURERS | 53 | 64 | |
| 208703 | COLORS-FOOD (MANUFACTURERS) | 13 | 16 | |
| 655301 | COLUMBARIUMS | 23 | 28 | |
| 179907 | COLUMNS | 108 | 130 | |
| 4939 | COMBINATION UTILITIES NEC | 702 | 842 | |
| 508774 | COMBS (WHOLESALE) | 13 | 16 | |
| 874860 | COMBUSTION & HEATING CONSULTANTS | 35 | 42 | |
| 382304 | COMBUSTION CONTROLS (MANUFACTURERS) | 92 | 110 | |
| 581307 | COMEDY CLUBS | 131 | 157 | |
| O | COMFORTMAKER | 34 | 41 | |
| O | COMFORTMAKER | 426 | 511 | |
| O | COMFORTMAKER | 117 | 140 | |
| O | COMFORTMAKER | 32 | 38 | |
| O | COMFORTMAKER/SINGER | 215 | 258 | |
| 594205 | COMIC BOOKS | 3605 | 4326 | |
| 364698 | COML IND INSTNL ELEC LIGHTING (MFRS) | 336 | 403 | |
| 899937 | COMMENTATORS NARRATORS & ANNOUNCERS | 3 | 4 | |
| 287904 | COMMERCIAL AGRICULTURAL CLEANERS (MFRS) | 6 | 7 | |
| 7336 | COMMERCIAL ART & GRAPHIC DESIGN | 28217 | 33860 | |
| 6029 | COMMERCIAL BANKS NEC | 77 | 92 | |
| 602999 | COMMERCIAL BANKS NEC | 77 | 92 | |
| 873298 | COMMERCIAL ECONOMIC EDUCATIONAL RESEARCH | 47 | 56 | |
| 8732 | COMMERCIAL ECONOMIC RESEARCH | 8432 | 10118 | |
| 3646 | COMMERCIAL ELECTRIC LIGHTING FIXTURES | 336 | 403 | |
| 5046 | COMMERCIAL EQUIPMENT NEC | 15807 | 18968 | |
| 504699 | COMMERCIAL EQUIPMENT NEC (WHOLESALE) | 120 | 144 | |
| 3582 | COMMERCIAL LAUNDRY & DRYCLEANING MACHS | 216 | 259 | |
| 358298 | COMMERCIAL LAUNDRY DRYCLEAN MACHS (MFRS) | 136 | 163 | |
| 615903 | COMMERCIAL PAPER | 21 | 25 | |
| 7335 | COMMERCIAL PHOTOGRAPHY | 21227 | 25472 | |
| 873198 | COMMERCIAL PHYSICAL RESEARCH | 462 | 554 | |
| 8731 | COMMERCIAL PHYSICAL/BIOLOGICAL RESEARCH | 24110 | 28932 | |
| 2759 | COMMERCIAL PRINTING NEC | 50151 | 60181 | |
| 275998 | COMMERCIAL PRINTING NEC | 30086 | 36103 | |
| 2754 | COMMERCIAL PRINTING-GRAVURE | 752 | 902 | |
| 275498 | COMMERCIAL PRINTING-GRAVURE | 342 | 410 | |
| 2752 | COMMERCIAL PRINTING-LITHOGRAPHIC | 62216 | 74659 | |
| 275298 | COMMERCIAL PRINTING-LITHOGRAPHIC | 2110 | 2532 | |
| 781202 | COMMERCIALS-RADIO & TELEVISION | 719 | 863 | |
| 581210 | COMMISSARY CONTRACTORS | 79 | 95 | |
| 514907 | COMMISSION MERCHANTS | 30 | 36 | |
| 622104 | COMMODITY BROKERS | 2205 | 2646 | |
| 6221 | COMMODITY CONTRACTS BROKERS & DEALERS | 2421 | 2905 | |
| 623103 | COMMODITY EXCHANGES | 22 | 26 | |
| 622103 | COMMODITY PRICE ANALYSTS | 31 | 37 | |
| 1 | COMMODORE (CBM) | 60 | 72 | |
| 366302 | COMMUNICATION EQUIPMENT-MANUFACTURERS | 165 | 198 | |
| 48 | COMMUNICATIONS | 59832 | 71798 | |
| 489903 | COMMUNICATIONS | 114 | 137 | |
| 874823 | COMMUNICATIONS CONSULTANTS | 5388 | 6466 | |
| 173127 | COMMUNICATIONS CONTRACTORS | 69 | 83 | |
| 506551 | COMMUNICATIONS EQUIPMENT (WHOLESALE) | 71 | 85 | |
| 3669 | COMMUNICATIONS EQUIPMENT NEC | 1780 | 2136 | |
| 366998 | COMMUNICATIONS EQUIPMENT NEC (MFRS) | 909 | 1091 | |
| 4899 | COMMUNICATIONS SERVICES NEC | 1205 | 1446 | |
| 489999 | COMMUNICATIONS SERVICES NEC | 234 | 281 | |
| 489901 | COMMUNICATIONS SERVICES-COMMON CARRIERS | 853 | 1024 | |
| 839914 | COMMUNITY ACTION AGENCIES | 491 | 589 | |
| 836113 | COMMUNITY CARE FACILITIES-ADULT CARE | 2 | 2 | |
| 864110 | COMMUNITY ORGANIZATIONS | 854 | 1025 | |
| 832229 | COMMUNITY SERVICES | 248 | 298 | |
| 173119 | COMMUTATORS | 6 | 7 | |
| 365206 | COMPACT DISCS-MANUFACTURERS | 6 | 7 | |
| 508230 | COMPACTORS-EARTH (WHOLESALE) | 30 | 36 | |
| 572211 | COMPACTORS-WASTE-HOUSEHOLD-DEALERS | 30 | 36 | |
| 358903 | COMPACTORS-WASTE-INDUSTRIAL/COML (MFRS) | 334 | 401 | |
| 363903 | COMPACTORS-WASTE-MANUFACTURERS | 9 | 11 | |
| 762907 | COMPACTORS-WASTE-SERVICE & REPAIR | 76 | 91 | |
| 506386 | COMPACTORS-WASTE-SUPPLIES & PARTS (WHOL) | 11 | 13 | |
| 506426 | COMPACTORS-WASTE-WHOLESALE | 10 | 12 | |
| 864120 | COMPANIONS-SOCIAL | 3 | 4 | |
| C | COMPAQ | 2247 | 2696 | |
| 354510 | COMPARATORS (MANUFACTURERS) | 14 | 17 | |
| Z | COMPASS ADJUSTERS | 17 | 20 | |
| 382901 | COMPASSES (MANUFACTURERS) | 44 | 53 | |
| 641124 | COMPENSATION-ACCIDENT SERVICE | 2 | 2 | |
| 287502 | COMPOSITES (MANUFACTURERS) | 14 | 17 | |
| 287503 | COMPOST (MANUFACTURERS) | 67 | 80 | |
| 508319 | COMPOST SHREDDING MACHINES (WHOLESALE) | 1 | 1 | |
| 508402 | COMPRESSORS-AIR & GAS (WHOLESALE) | 3678 | 4414 | |
| 735950 | COMPRESSORS-AIR & GAS-RENTING | 1301 | 1561 | |
| 769978 | COMPRESSORS-AIR & GAS-REPAIRING | 1038 | 1246 | |
| 507522 | COMPRESSORS-AIR COND & REFRIG (WHOL) | 6 | 7 | |
| 356301 | COMPRESSORS-AIR-MANUFACTURERS | 424 | 509 | |
| 5734 | COMPUTER & COMPUTER SOFTWARE STORES | 84582 | 101498 | |
| 421226 | COMPUTER & ELECTRONIC EQUIPMENT MOVERS | 7 | 8 | |
| 573407 | COMPUTER & EQUIPMENT DEALERS | 30298 | 36358 | |
| 573411 | COMPUTER BOOKS-DEALERS | 10 | 12 | |
| 737403 | COMPUTER BULLETIN BOARDS | 653 | 784 | |
| 799725 | COMPUTER CLUBS | 8 | 10 | |
| 737905 | COMPUTER CONSULTANTS | 768 | 922 | |
| 737409 | COMPUTER DATA STORAGE | 29 | 35 | |
| 737305 | COMPUTER DISASTER PLANNING | 165 | 198 | |
| 737698 | COMPUTER FACILITIES MANAGEMENT | 19 | 23 | |
| 7376 | COMPUTER FACILITIES MANAGEMENT SERVICES | 19 | 23 | |
| 573404 | COMPUTER FURNITURE | 218 | 262 | |
| 737105 | COMPUTER GRAPHICS | 5029 | 6035 | |
| 7373 | COMPUTER INTEGRATED SYSTEMS DESIGN | 2691 | 3229 | |
| 737398 | COMPUTER INTEGRATED SYSTEMS DESIGN | 338 | 406 | |
| 7378 | COMPUTER MAINTENANCE & REPAIR | 21923 | 26308 | |
| 573410 | COMPUTER MUSIC PRODUCTS | 3 | 4 | |
| 573402 | COMPUTER PARTS & SUPPLIES | 8359 | 10031 | |
| 3577 | COMPUTER PERIPHERAL EQUIPMENT NEC | 1571 | 1885 | |
| 357702 | COMPUTER PERIPHERALS (MANUFACTURERS) | 1189 | 1427 | |
| 729964 | COMPUTER PICTURES-NOVELTY | 27 | 32 | |
| 737908 | COMPUTER PRESENTATIONS | 4 | 5 | |
| 7374 | COMPUTER PROCESSING & DATA PREPARATION | 17550 | 21060 | |
| 7371 | COMPUTER PROGRAMMING SERVICES | 42147 | 50576 | |
| 737102 | COMPUTER PROGRAMMING SERVICES | 744 | 893 | |
| 7379 | COMPUTER RELATED SERVICES NEC | 9241 | 11089 | |
| 737999 | COMPUTER RELATED SERVICES NEC | 317 | 380 | |
| 7377 | COMPUTER RENTAL & LEASING | 3067 | 3680 | |
| 737805 | COMPUTER ROOM CLEANING | 4 | 5 | |
| 573412 | COMPUTER ROOM FURNITURE & STORAGE SYSTS | 2 | 2 | |
| 179935 | COMPUTER ROOMS-INSTALLATION & EQUIPMENT | 1777 | 2132 | |
| 737101 | COMPUTER SERVICES | 1653 | 1984 | |
| 573401 | COMPUTER SOFTWARE | 41886 | 50263 | |
| 737201 | COMPUTER SOFTWARE-MANUFACTURERS | 1130 | 1356 | |
| 504509 | COMPUTER SOFTWARE-WHOLESALE | 182 | 218 | |
| 3572 | COMPUTER STORAGE DEVICES | 198 | 238 | |
| 357298 | COMPUTER STORAGE DEVICES (MANUFACTURERS) | 198 | 238 | |
| 357701 | COMPUTER SUPPLIES & PARTS-MANUFACTURERS | 402 | 482 | |
| 3575 | COMPUTER TERMINALS | 210 | 252 | |
| 357598 | COMPUTER TERMINALS (MANUFACTURERS) | 210 | 252 | |
| 737402 | COMPUTER TIME SHARING SERVICE | 292 | 350 | |
| 824301 | COMPUTER TRAINING | 8052 | 9662 | |
| 737804 | COMPUTER WIRING | 1728 | 2074 | |
| C | COMPUTERLAND | 2 | 2 | |
| 5045 | COMPUTERS & COMPUTER PERIPHERAL EQUIP | 9492 | 11390 | |
| 573405 | COMPUTERS-DEALERS-USED | 2537 | 3044 | |
| 737907 | COMPUTERS-ENHANCEMENTS | 103 | 124 | |
| 737302 | COMPUTERS-EQUIPMENT INSTALLATION | 78 | 94 | |
| 357101 | COMPUTERS-MANUFACTURERS | 2335 | 2802 | |
| 737307 | COMPUTERS-MULTIMEDIA | 699 | 839 | |
| 737904 | COMPUTERS-NETWORKING | 7564 | 9077 | |
| 824302 | COMPUTERS-PROGRAMMING INSTRUCTION | 211 | 253 | |
| 737701 | COMPUTERS-RENTING & LEASING | 3032 | 3638 | |
| 737801 | COMPUTERS-SERVICE & REPAIR | 20279 | 24335 | |
| 504502 | COMPUTERS-SUPPLIES & PARTS-WHOLESALE | 513 | 616 | |
| 504510 | COMPUTERS-SUPPLY-REMANUFACTURING (WHOL) | 3 | 4 | |
| 737103 | COMPUTERS-SYSTEM DESIGNERS & CONSULTANTS | 32409 | 38891 | |
| 737308 | COMPUTERS-VIRTUAL REALITY | 23 | 28 | |
| 504503 | COMPUTERS-WHOLESALE | 3850 | 4620 | |
| 504405 | COMPUTING DEVICES (WHOLESALE) | 37 | 44 | |
| 737410 | COMPUTING SERVICE | 19 | 23 | |
| 792213 | CONCERT BUREAUS | 259 | 311 | |
| 799921 | CONCESSIONAIRES | 912 | 1094 | |
| 514503 | CONCESSIONAIRES EQUIP & SUPPLIES (WHOL) | 97 | 116 | |
| 729965 | CONCIERGE SERVICE | 47 | 56 |