Links to: BA-BL, BL-BU
| 502305 | BLANKETS (WHOLESALE) | 86 | 102 | |
| 223104 | BLANKETS-MANUFACTURERS | 9 | 11 | |
| 502121 | BLEACHERS & GRANDSTANDS (WHOLESALE) | 160 | 192 | |
| 226103 | BLEACHERY | 4 | 5 | |
| 281903 | BLEACHING COMPOUNDS-MANUFACTURERS | 21 | 25 | |
| 516958 | BLEACHING COMPOUNDS-WHOLESALE | 7 | 8 | |
| 836106 | BLIND INSTITUTIONS | 52 | 62 | |
| 864112 | BLIND ORGANIZATIONS | 170 | 204 | |
| 259104 | BLINDS-VENETIAN & VERTICAL-MANUFACTURERS | 357 | 428 | |
| 809916 | BLOOD BANKS & CENTERS | 1065 | 1278 | |
| 729972 | BLOOD PRESSURE CHECKING SERVICE | 4 | 5 | |
| 807109 | BLOOD TESTS | 95 | 114 | |
| 233101 | BLOUSES-MANUFACTURERS | 330 | 396 | |
| 563203 | BLOUSES-RETAIL | 4 | 5 | |
| 513727 | BLOUSES-WHOLESALE | 3 | 4 | |
| 342310 | BLOW TORCHES (MANUFACTURERS) | 3 | 4 | |
| 179603 | BLOWERS & BLOWER SYSTEMS | 529 | 635 | |
| 507518 | BLOWERS & BLOWER SYSTEMS-WHOLESALE | 2 | 2 | |
| 356403 | BLOWERS-MANUFACTURERS | 45 | 54 | |
| D | BLUE CROSS-BLUE SHIELD | 37 | 44 | |
| D | BLUE CROSS-BLUE SHIELD | 14 | 17 | |
| D | BLUE CROSS-BLUE SHIELD | 1 | 1 | |
| D | BLUE CROSS-BLUE SHIELD | 2 | 2 | |
| D | BLUE CROSS-BLUE SHIELD | 3531 | 4237 | |
| 874116 | BLUEPRINT EXCHANGE SERVICES | 1 | 1 | |
| 733401 | BLUEPRINTING | 3334 | 4001 | |
| 504410 | BLUEPRINTING EQUIPMENT & SUPPLIES (WHOL) | 631 | 757 | |
| 386101 | BLUEPRINTING EQUIPMENT & SUPPLIES-MFRS | 72 | 86 | |
| 762943 | BLUEPRINTING EQUIPMENT-REPAIRING & SVC | 9 | 11 | |
| B | B'NAI B'RITH | 11 | 13 | |
| F | BOARD OF EDUCATION | 1719 | 2063 | |
| 651302 | BOARDING HOUSES | 1611 | 1933 | |
| 623104 | BOARDS OF TRADE | 25 | 30 | |
| 253101 | BOAT & VAN SEATING-MANUFACTURERS | 20 | 24 | |
| 753216 | BOAT & YACHT CUSTOMIZING | 1 | 1 | |
| 509121 | BOAT BROKERS | 123 | 148 | |
| 373201 | BOAT BUILDERS & YARDS | 1693 | 2032 | |
| 521151 | BOAT BUILDERS-MATERIALS | 2 | 2 | |
| 3732 | BOAT BUILDING & REPAIRING | 2714 | 3257 | |
| 373298 | BOAT BUILDING & REPAIRING | 765 | 918 | |
| 449904 | BOAT CLEANING | 432 | 518 | |
| 864122 | BOAT CLUBS | 3 | 4 | |
| 555102 | BOAT COVERS TOPS & UPHOLSTERY | 4068 | 4882 | |
| 239404 | BOAT COVERS TOPS & UPHOLSTERY-MFRS | 71 | 85 | |
| 509128 | BOAT COVERS TOPS & UPHOLSTERY-WHOLESALE | 27 | 32 | |
| 519990 | BOAT COVERS TOPS/UPHOLSTERY MTRLS-DISTR | 4 | 5 | |
| 5551 | BOAT DEALERS | 24341 | 29209 | |
| 555104 | BOAT DEALERS | 11408 | 13690 | |
| 509103 | BOAT DISTRIBUTORS | 71 | 85 | |
| 449309 | BOAT DOCKS | 2 | 2 | |
| 555103 | BOAT EQUIPMENT & SUPPLIES | 3487 | 4184 | |
| 373202 | BOAT EQUIPMENT & SUPPLIES-MANUFACTURERS | 90 | 108 | |
| 509105 | BOAT EQUIPMENT & SUPPLIES-WHOLESALE | 30 | 36 | |
| 449903 | BOAT LAUNCHING | 219 | 263 | |
| 353602 | BOAT LIFTS (MANUFACTURERS) | 169 | 203 | |
| 449301 | BOAT MOORAGES | 95 | 114 | |
| 172106 | BOAT PAINTING & LETTERING | 219 | 263 | |
| 555126 | BOAT PERFORMANCE & RACING EQUIPMENT | 2 | 2 | |
| 449304 | BOAT REPAIRING | 8236 | 9883 | |
| 753217 | BOAT RESTORATION | 12 | 14 | |
| 449302 | BOAT STORAGE | 3899 | 4679 | |
| 449905 | BOAT TRANSPORTING | 429 | 515 | |
| 555120 | BOAT WINDOWS | 2 | 2 | |
| 449303 | BOAT YARDS | 515 | 618 | |
| 799914 | BOATING INSTRUCTION | 309 | 371 | |
| 448902 | BOATS-EXCURSIONS | 653 | 784 | |
| 799913 | BOATS-RENTAL & CHARTER | 5349 | 6419 | |
| 355201 | BOBBIN-MANUFACTURERS | 3 | 4 | |
| 809309 | BODY MOVEMENT EDUCATION | 10 | 12 | |
| 729979 | BODY PIERCING | 271 | 325 | |
| 723116 | BODY WRAP SALONS | 30 | 36 | |
| 738119 | BODYGUARD SERVICE | 7 | 8 | |
| 516959 | BOILER COMPOUNDS (WHOLESALE) | 30 | 36 | |
| 171139 | BOILER SETTING | 8 | 10 | |
| 331701 | BOILER TUBES (MANUFACTURERS) | 5 | 6 | |
| 507420 | BOILERS-NEW & USED (WHOLESALE) | 2024 | 2429 | |
| 343301 | BOILERS-NEW & USED-MANUFACTURERS | 144 | 173 | |
| 735942 | BOILERS-RENTING | 129 | 155 | |
| 171118 | BOILERS-REPAIRING & CLEANING | 3413 | 4096 | |
| 507412 | BOILERS-SUPPLIES & PARTS (WHOLESALE) | 442 | 530 | |
| 6 | BOLENS | 852 | 1022 | |
| 6 | BOLENS | 1 | 1 | |
| 201302 | BOLOGNA-MANUFACTURERS | 3 | 4 | |
| 507201 | BOLTS & NUTS (WHOLESALE) | 2182 | 2618 | |
| 345202 | BOLTS & NUTS-MANUFACTURERS | 321 | 385 | |
| 525111 | BOLTS & NUTS-RETAIL | 179 | 215 | |
| 3452 | BOLTS NUTS SCREWS RIVETS & WASHERS | 1702 | 2042 | |
| 345298 | BOLTS NUTS SCREWS RIVETS/WASHERS (MFRS) | 1055 | 1266 | |
| 495319 | BOMB DISPOSAL | 2 | 2 | |
| B | BONANZA | 148 | 178 | |
| 635106 | BONDING AGENTS | 7 | 8 | |
| 635101 | BONDS-BAIL | 6089 | 7307 | |
| 628903 | BONDS-MUNICIPAL & CORPORATE | 16 | 19 | |
| 635102 | BONDS-SURETY & FIDELITY | 5834 | 7001 | |
| 999936 | BONES | 2 | ||
| 526111 | BONSAI PLANTS & SUPPLIES | 13 | 16 | |
| 278904 | BOOK & CATALOG COVERS (MANUFACTURERS) | 79 | 95 | |
| 594204 | BOOK DEALERS-PRO TECHNICAL & TRADE | 116 | 139 | |
| 594201 | BOOK DEALERS-RETAIL | 21363 | 25636 | |
| 593201 | BOOK DEALERS-USED & RARE | 6228 | 7474 | |
| 519202 | BOOK DEALERS-WHOLESALE | 1093 | 1312 | |
| 2732 | BOOK PRINTING | 697 | 836 | |
| 273298 | BOOK PRINTING | 631 | 757 | |
| 733814 | BOOK REVIEWERS | 5 | 6 | |
| 5942 | BOOK STORES | 25138 | 30166 | |
| 278902 | BOOKBINDERS | 2144 | 2573 | |
| 508489 | BOOKBINDERS EQUIPMENT & SUPPLIES (WHOL) | 325 | 390 | |
| 278906 | BOOKBINDERS-HOME LIBRARY | 20 | 24 | |
| 278998 | BOOKBINDING & RELATED WORK | 1165 | 1398 | |
| 571212 | BOOKCASES | 161 | 193 | |
| 273201 | BOOK-MANUFACTURERS | 63 | 76 | |
| 594209 | BOOKS ON TAPE | 9 | 11 | |
| 5192 | BOOKS PERIODICALS & NEWSPAPERS | 2380 | 2856 | |
| 2731 | BOOKS-PUBLISHING & PRINTING | 7302 | 8762 | |
| 273198 | BOOKS-PUBLISHING & PRINTING | 1082 | 1298 | |
| 444905 | BOOMING & RAFTING | 3 | 4 | |
| 3131 | BOOT & SHOE-CUT STOCK & FINDINGS | 222 | 266 | |
| 313198 | BOOT & SHOE-CUT STOCK & FINDINGS (MFRS) | 81 | 97 | |
| 254207 | BOOTHS-TELEPHONE (MANUFACTURERS) | 15 | 18 | |
| 382922 | BOOTHS-TOLL & PARKING LOT & ETC (MFRS) | 31 | 37 | |
| 566103 | BOOTS | 3778 | 4534 | |
| 314301 | BOOTS-MANUFACTURERS | 31 | 37 | |
| 725107 | BOOTS-REPAIRING | 8 | 10 | |
| 513901 | BOOTS-WHOLESALE | 62 | 74 | |
| 281908 | BORAX (MANUFACTURERS) | 1 | 1 | |
| 179928 | BORING CONTRACTORS | 125 | 150 | |
| D | BOSCH | 170 | 204 | |
| 3 | BOSCH | 741 | 889 | |
| 1 | BOSTON MARKET | 723 | 868 | |
| 842207 | BOTANICAL GARDENS | 103 | 124 | |
| 346601 | BOTTLE CAPS & SEALS (MANUFACTURERS) | 111 | 133 | |
| 346916 | BOTTLE OPENERS (MANUFACTURERS) | 1 | 1 | |
| 275930 | BOTTLE WRAPPERS (MANUFACTURERS) | 1 | 1 | |
| 2086 | BOTTLED & CANNED SOFT DRINKS | 2020 | 2424 | |
| 208601 | BOTTLERS | 1898 | 2278 | |
| 508526 | BOTTLERS EQUIPMENT & SUPPLIES (WHOL) | 77 | 92 | |
| 359907 | BOTTLERS EQUIPMENT & SUPPLIES-MFRS | 1 | 1 | |
| 322101 | BOTTLES (MANUFACTURERS) | 251 | 301 | |
| 275905 | BOTTLES-PRINTING | 17 | 20 | |
| 509326 | BOTTLES-USED (WHOLESALE) | 4 | 5 | |
| 508559 | BOTTLES-WHOLESALE | 351 | 421 | |
| 399940 | BOUTIQUE ITEMS-MANUFACTURERS | 36 | 43 | |
| 562105 | BOUTIQUE ITEMS-RETAIL | 5040 | 6048 | |
| 519924 | BOUTIQUE ITEMS-WHOLESALE | 144 | 173 | |
| 508777 | BOUTIQUES-SUPPLIES (WHOLESALE) | 1 | 1 | |
| 594139 | BOWLING APPAREL & ACCESSORIES | 1954 | 2345 | |
| 238907 | BOWLING APPAREL & ACCESSORIES-MFRS | 10 | 12 | |
| 509129 | BOWLING APPAREL & ACCESSORIES-WHOLESALE | 39 | 47 | |
| 394901 | BOWLING BALL-MANUFACTURERS | 4 | 5 | |
| 7933 | BOWLING CENTERS | 6613 | 7936 | |
| 793301 | BOWLING CENTERS | 6613 | 7936 | |
| 799916 | BOWLING INSTRUCTION | 324 | 389 | |
| 509104 | BOWLING LANE EQUIPMENT & SUPLS (WHOL) | 202 | 242 | |
| 179930 | BOWLING LANE REFINISHING & REPAIRING | 64 | 77 | |
| 581215 | BOX LUNCHES | 354 | 425 | |
| 514967 | BOX LUNCHES-WHOLESALE | 4 | 5 | |
| 342311 | BOX OPENERS (MANUFACTURERS) | 3 | 4 | |
| 267501 | BOX PARTITIONS (MANUFACTURERS) | 37 | 44 | |
| 511318 | BOXES-CORRUGATED & FIBER (WHOLESALE) | 8889 | 10667 | |
| 265701 | BOXES-FOLDING-MANUFACTURERS | 995 | 1194 | |
| 508557 | BOXES-METAL (WHOLESALE) | 60 | 72 | |
| 349911 | BOXES-METAL-MANUFACTURERS | 9 | 11 | |
| 265201 | BOXES-PAPER (MANUFACTURERS) | 1151 | 1381 | |
| 265303 | BOXES-PAPER-GLUING & FINISHING (MFRS) | 26 | 31 | |
| 511319 | BOXES-PAPER-WHOLESALE | 4 | 5 | |
| 308907 | BOXES-PLASTIC & TRANSPARENT (MFRS) | 90 | 108 | |
| 511307 | BOXES-SPECIALTY & FANCY (WHOLESALE) | 240 | 288 | |
| 265702 | BOXES-SPECIALTY & FANCY-MANUFACTURERS | 15 | 18 | |
| 509304 | BOXES-USED (WHOLESALE) | 48 | 58 | |
| 244904 | BOXES-WIRE BOUND (MANUFACTURERS) | 21 | 25 | |
| 508555 | BOXES-WOODEN (WHOLESALE) | 629 | 755 | |
| 244101 | BOXES-WOODEN-MANUFACTURERS | 131 | 157 | |
| 799978 | BOXING INSTRUCTION | 81 | 97 | |
| 511310 | BOX-MANUFACTURERS EQUIP & SUPLS (WHOL) | 58 | 70 | |
| 263101 | BOX-MANUFACTURERS EQUIP & SUPPLIES-MFRS | 2 | 2 | |
| 999938 | BOY & GIRL ORGANIZATIONS SUPPLIES | 70 | ||
| 232907 | BOYS CLOTHING & FURNISHINGS-MFRS | 42 | 50 | |
| 561103 | BOYS CLOTHING & FURNISHINGS-RETAIL | 247 | 296 | |
| 513605 | BOYS CLOTHING & FURNISHINGS-WHOLESALE | 40 | 48 | |
| 342915 | BRACKETS (MANUFACTURERS) | 19 | 23 | |
| 224102 | BRAIDS (MANUFACTURERS) | 112 | 134 | |
| 729940 | BRAILLE SUPPLIES | 50 | 60 | |
| 553124 | BRAKE FLUIDS | 8 | 10 | |
| 299204 | BRAKE FLUIDS-MANUFACTURERS | 1 | 1 | |
| 501316 | BRAKE LINING-DISTRIBUTORS | 283 | 340 | |
| 306909 | BRAKE LINING-MANUFACTURERS | 120 | 144 | |
| 753930 | BRAKE PARTS & SUPPLIES | 13 | 16 | |
| 753914 | BRAKE SERVICE | 34253 | 41104 | |
| 501334 | BRAKE SERVICE EQUIPMENT (WHOLESALE) | 92 | 110 | |
| 371427 | BRAKE SERVICE EQUIPMENT-MANUFACTURERS | 12 | 14 | |
| 753917 | BRAKE SHOE BONDING & EXCHANGING | 78 | 94 | |
| 501315 | BRAKES-DISTRIBUTORS | 436 | 523 | |
| 371411 | BRAKES-MANUFACTURERS | 263 | 316 | |
| 5 | BRANCH OFFICE | 11 | 13 | |
| 5 | BRANCH OFFICE | 5 | 6 | |
| 5 | BRANCH OFFICE | 35 | 42 | |
| 5 | BRANCH OFFICE | 4 | 5 | |
| 5 | BRANCH OFFICE | 1241 | 1489 | |
| 6081 | BRANCHES & AGENCIES OF FOREIGN BANKS | 395 | 474 | |
| 608198 | BRANCHES & AGENCIES OF FOREIGN BANKS | 395 | 474 | |
| 395302 | BRANDING EQUIPMENT (MANUFACTURERS) | 9 | 11 | |
| 336602 | BRASS (MANUFACTURERS) | 559 | 671 | |
| 334106 | BRASS MILLS | 4 | 5 | |
| 344601 | BRASS PRODUCTS (MANUFACTURERS) | 337 | 404 | |
| 507425 | BRASS PRODUCTS-WHOLESALE | 6 | 7 | |
| 571937 | BRASS-DECORATIVE ACCESSORIES | 53 | 64 | |
| 563205 | BRASSIERES | 539 | 647 | |
| 2342 | BRASSIERES GIRDLES & ALLIED GARMENTS | 193 | 232 | |
| 234298 | BRASSIERES GIRDLES/ALLIED GRMNTS (MFRS) | 99 | 119 | |
| 234201 | BRASSIERES-MANUFACTURERS | 14 | 17 | |
| 513728 | BRASSIERES-WHOLESALE | 15 | 18 | |
| 507426 | BRASS-WHOLESALE | 11 | 13 | |
| A | BRAUM'S ICE CREAM & DAIRY | 250 | 300 | |
| 769206 | BRAZING | 180 | 216 | |
| 2051 | BREAD & OTHER BAKERY PRODUCTS | 2394 | 2873 | |
| 205198 | BREAD/OTHER BAKERY PROD-EX COOKIES (MFR) | 2316 | 2779 | |
| 502114 | BREAKFAST NOOKS & BOOTHS (WHOLESALE) | 41 | 49 | |
| 839916 | BREASTFEEDING SUPPLIES & INFORMATION | 411 | 493 | |
| 873143 | BREATH DEODORANTS | 3 | 4 | |
| 208201 | BREWERS | 813 | 976 | |
| 518206 | BREWERS EQUIPMENT & SUPPLIES (WHOL) | 152 | 182 | |
| 3251 | BRICK & STRUCTURAL CLAY TILE | 1351 | 1621 | |
| X | BRICK CLEANERS | 29 | 35 | |
| 355920 | BRICK MAKERS' EQUIPMENT (MANUFACTURERS) | 7 | 8 | |
| 521170 | BRICK PAVERS | 18 | 22 | |
| 516964 | BRICK PRESERVATIVES (WHOLESALE) | 6 | 7 | |
| 5032 | BRICK STONE & RELATED MATERIALS | 29973 | 35968 | |
| 503212 | BRICK-CLAY COMMON & FACE (WHOLESALE) | 2186 | 2623 | |
| 325101 | BRICK-CLAY COMMON & FACE-MANUFACTURERS | 1336 | 1603 | |
| 521157 | BRICK-CONCRETE PUMICE & ETC | 50 | 60 | |
| 503901 | BRICK-FIRE (WHOLESALE) | 182 | 218 | |
| 329702 | BRICK-IMITATION (MANUFACTURERS) | 3 | 4 | |
| 325102 | BRICK-MANUFACTURERS | 28 | 34 | |
| 521123 | BRICK-USED | 131 | 157 | |
| 503240 | BRICK-USED-WHOLESALE | 1 | 1 | |
| 721906 | BRIDAL GOWN PRESERVATION SERVICE | 1961 | 2353 | |
| 233502 | BRIDAL GOWNS-WOMENS MISSES & JRS-MFRS | 18 | 22 | |
| 594706 | BRIDAL REGISTRIES | 1687 | 2024 | |
| 562104 | BRIDAL SHOPS | 8818 | 10582 | |
| 234203 | BRIDAL SUPPLIES-MANUFACTURERS | 75 | 90 | |
| 513717 | BRIDAL SUPPLIES-WHOLESALE | 188 | 226 | |
| 478505 | BRIDGE & TUNNEL OPERATING COMPANIES | 38 | 46 | |
| 162203 | BRIDGE BUILDERS | 280 | 336 | |
| 799915 | BRIDGE CLUBS | 224 | 269 | |
| 799981 | BRIDGE INSTRUCTION | 42 | 50 | |
| 162298 | BRIDGE TUNNEL & ELEVATED HIGHWAY | 120 | 144 | |
| 1622 | BRIDGE TUNNEL & ELEVATED HIGHWAY CONSTR | 1424 | 1709 | |
| 1 | BRIDGESTONE | 5867 | 7040 | |
| 1 | BRIGGS & STRATTON | 103 | 124 | |
| B | BRIGGS & STRATTON | 1837 | 2204 | |
| 1 | BRIGGS & STRATTON | 7611 | 9133 | |
| 281909 | BRINE (MANUFACTURERS) | 12 | 14 | |
| 299901 | BRIQUETTES (MANUFACTURERS) | 9 | 11 | |
| 282402 | BRISTLES (MANUFACTURERS) | 3 | 4 | |
| 549930 | BRITISH FOOD PRODUCTS | 2 | 2 | |
| 354502 | BROACHES (MANUFACTURERS) | 10 | 12 | |
| 354102 | BROACHING (MANUFACTURERS) | 96 | 115 | |
| 508476 | BROACHING TOOLS & EQUIPMENT (WHOLESALE) | 59 | 71 | |
| 483203 | BROADCASTING COMPANIES | 32 | 38 | |
| 366311 | BROADCASTING EQUIPMENT (MANUFACTURERS) | 33 | 40 | |
| 2211 | BROADWOVEN FABRIC MILLS-COTTON | 1658 | 1990 | |
| 221198 | BROADWOVEN FABRIC MILLS-COTTON | 550 | 660 | |
| 2221 | BROADWOVEN FABRIC MILLS-MANMADE & SILK | 1150 | 1380 | |
| 2231 | BROADWOVEN FABRIC MILLS-WOOL | 233 | 280 | |
| 0251 | BROILER FRYER & ROASTER CHICKENS | 20 | 24 | |
| 025198 | BROILER FRYER & ROASTER CHICKENS | 20 | 24 | |
| 628904 | BROKERS-COUNTERTRADE | 3 | 4 | |
| 653103 | BROKERS-HOTEL MOTEL & APARTMENT HOUSE | 37 | 44 | |
| 473108 | BROKERS-MERCHANDISE | 55 | 66 | |
| 473105 | BROKERS-MOTOR TRANSPORTATION | 137 | 164 | |
| 336601 | BRONZE (MANUFACTURERS) | 237 | 284 | |
| 599987 | BRONZE CEMETERY MARKERS | 49 | 59 | |
| 284208 | BRONZE CLEANING (MANUFACTURERS) | 1 | 1 | |
| 344610 | BRONZE ORNAMENTAL WORK (MANUFACTURERS) | 34 | 41 | |
| 281605 | BRONZE POWDERS & LIQUIDS (MFRS) | 7 | 8 | |
| 349912 | BRONZE PRODUCTS (MANUFACTURERS) | 11 | 13 | |
| 349902 | BRONZE TABLETS (MANUFACTURERS) | 414 | 497 | |
| 335106 | BRONZE-SHEET ROD TUBE & ETC (MFRS) | 1 | 1 | |
| 399104 | BROOM MANUFACTURERS-EQUIP & SUPLS (MFRS) | 30 | 36 | |
| 3991 | BROOMS & BRUSHES | 439 | 527 | |
| 399198 | BROOMS & BRUSHES (MANUFACTURERS) | 263 | 316 | |
| 519923 | BROOMS (WHOLESALE) | 123 | 148 | |
| 399101 | BROOMS-MANUFACTURERS | 41 | 49 | |
| B | BROTHER | 439 | 527 | |
| 078217 | BRUSH REMOVAL SERVICE | 5 | 6 | |
| 508706 | BRUSHES (WHOLESALE) | 468 | 562 | |
| 571942 | BRUSHES-RETAIL (HOUSEHOLD) | 82 | 98 | |
| 399102 | BRUSH-MANUFACTURERS | 96 | 115 |