| 4201 | WSLZ | WILEY SANDERS TRUCK LINES, INC. | | | PWRC |
| 4202 | WSLZ | Wiley Sanders Truck Lines | | | RSRV |
| 4203 | WSLZ | WILEY SANDERS TRUCK LINES, INC. | | | SCAC4 |
| 4204 | WSM | Wisman Aviation | Callsign: Wisman, | USA | AVCODES |
| 4205 | WSM | Wisman Aviation | | | ICAO1 |
| 4206 | WSMA | WORLD SHIPPING MANAGEMENT CORP SA | | | SCAC4 |
| 4207 | WSMD | WISMER CLYDES | | | SCAC4 |
| 4208 | WSMF | WARNER AND SMITH MTR FRT INC | | | PWRC |
| 4209 | WSMO | WINTERS SAUSAGE MFG CO | | | SCAC4 |
| 4210 | WSMP | WORLD SPEED MOTORSPORTS | | | SCAC4 |
| 4211 | WSMR | The Wrexham, Shropshire & Marylebone Railway Company Ltd. | | UK | VKM |
| 4212 | WSMS | WARNER-SCH | | | SCAC4 |
| 4213 | WSMU | WESTERN SALES & TESTING INC. | | USA | BIC |
| 4214 | WSMU | Western Sales & Testing | | | RSRV |
| 4215 | WSMU | WESTERN SALES & TESTING INC | | | SCAC4 |
| 4216 | WSN | Air Wisconsin Airlines Corporation (AWAC) | IATA: ZW, Callsign: Wisconsin, IATA Prefix: 303, ICAO designator changed to AWI. ICAO Callsign changed from Air Wisconsin | USA | AVCODES |
| 4217 | WSN | Advanced Air, LLC | IATA: AN, Callsign: Wingspan, | USA | AVCODES |
| 4218 | WSN | Washington Southern Ry. (Richmond, Fredericksburg & Potomac Ry.) | 8/1920-7/1923 | | NAKINA |
| 4219 | WSN | RICHMOND, FREDERICKSBURG & POTOMAC RWY. [WASHINGTON SOUTHERN RWY.] | | | PWRC |
| 4220 | WSNB | WESTERMA | | | SCAC4 |
| 4221 | WSNJ | WILSON, JAMES COMPANY | | | SCAC4 |
| 4222 | WSNM | WESTON TRANSPORTATION INC | | | SCAC4 |
| 4223 | WSNO | WEST STAR TRANSPORTATION INC | | | SCAC4 |
| 4224 | WSNQ | WESTERN TRANSPORT | | | SCAC4 |
| 4225 | WSNU | WILHELM STUHRENBERG GMBH & CO. KG | | D | BIC |
| 4226 | WSNU | WILHELM STUHRENBERG GMBH & CO KG | | | SCAC4 |
| 4227 | WSNY | WALLEM SH | | | SCAC4 |
| 4228 | WSOC | WOSCA TRANSPORTATION SERVICES | | | SCAC1 |
| 4229 | WSOC | WHITE STONE CALCIUM INC | | | SCAC4 |
| 4230 | WSOG | WILSON LOGISTICS INC | | | SCAC4 |
| 4231 | WSOI | WHITE STAR OIL | | | SCAC4 |
| 4232 | WSOL | WALSH OIL COMPANY INC | | | SCAC4 |
| 4233 | WSON | WILSON OIL INC | | | SCAC4 |
| 4234 | WSOQ | WST COOP TRANSPORT | | | SCAC4 |
| 4235 | WSOR | Wisconsin & Southern R.R. Co. | added 10/1980; 1/1994-7/2005 | | NAKINA |
| 4236 | WSOR | Wisconsin & Southern R.R. Co. | added 10/80; 1/94-7/2000 | | NRHS |
| 4237 | WSOR | WISCONSIN & SOUTHERN RAILROAD COMPANY | | | PWRC |
| 4238 | WSOR | Wisconsin and Southern Railroad | | | RSRV |
| 4239 | WSOR | WISCONSIN & SOUTHERN RAILROAD COMPA | | | SCAC4 |
| 4240 | WSOR | Wisconsin & Southern Railroad | | USA | TRAFFIC |
| 4241 | WSOX | Wisconsin & Southern Leasing Co. | added 7/1981; eliminated 1/1991 | | NAKINA |
| 4242 | WSOX | Upper Merion and Plymouth Leasing Co. | added 1/1991; 1/1994 | | NAKINA |
| 4243 | WSOX | Upper Merion and Plymouth Co. | eliminated 4/1996 | | NAKINA |
| 4244 | WSOX | First Union Rail | added 4/1996; 7/2000-7/2005 | | NAKINA |
| 4245 | WSOX | Wisconsin & Southern Leasing Co. | added 7/81; eliminated 1/91 | | NRHS |
| 4246 | WSOX | Upper Merion and Plymouth Leasing Co. | added 1/91; 1/94 | | NRHS |
| 4247 | WSOX | Upper Merion and Plymouth Co. | eliminated 4/96 | | NRHS |
| 4248 | WSOX | First Union Rail | added 4/96; 7/2000 | | NRHS |
| 4249 | WSOX | FIRST UNION RAIL [(UMPX) UPPER MERION AND PLYMOUTH LEASING CO.; WISCONSIN & SOUTHERN LEASING CO.] | | | PWRC |
| 4250 | WSOX | Wisconsin and Southern Leasing | | | RSRV |
| 4251 | WSOX | FIRST UNION RAIL | | | SCAC4 |
| 4252 | WSOZ | (WSOR) WISCONSIN & SOUTHERN RAILROAD COMPANY | | | PWRC |
| 4253 | WSOZ | Wisconsin and Southern Railroad | | | RSRV |
| 4254 | WSOZ | WISCONSIN & SOUTHERN RAILROAD | | | SCAC4 |
| 4255 | WSP | WorldSpan | IATA: 1P, Computer Reservation System | USA | AVCODES |
| 4256 | WSP | Travelport d/b/a WorldSpan | IATA: 1P, Computer Reservation System | USA | AVCODES |
| 4257 | WSP | VeriJet, Inc. | Callsign: Whisper Jet, | USA | AVCODES |
| 4258 | WSPA | WIND SPIRIT ART AND GALLERY | | | SCAC4 |
| 4259 | WSPB | WHITE STALLION PRODUCTIONS INC | | | SCAC4 |
| 4260 | WSPD | WASP TRANSPORT INC | | | SCAC4 |
| 4261 | WSPG | WILLIAMS, SHUMAKER PC | | | SCAC4 |
| 4262 | WSPI | WESTERN STATES PROPERTIES INC. | | | PWRC |
| 4263 | WSPI | WILLIAMS SHOW PRODUCTIONS INC | | | SCAC4 |
| 4264 | WSPL | WESTERN EQUIPMENT LIMITED | | | SCAC4 |
| 4265 | WSPN | WESTPORT EXPRESS INC | | | SCAC4 |
| 4266 | WSPO | Werkspoor: Nederlandsche Fabriek van Werktuigen en Spoorwegmaterieel | | NL | TRAFFIC |
| 4267 | WSPS | WHOLESALE PRODUCE SUPPLY LLC | | | SCAC4 |
| 4268 | WSPW | WELLARD SHIPS PTE LTD | | | SCAC4 |
| 4269 | WSPX | Wheelstar Corp. | 1/1994-7/2005 (not listed) | | NAKINA |
| 4270 | WSPX | Wheelstar Corp. | 1/94-7/2000 | | NRHS |
| 4271 | WSPX | WHEELSTAR CORP. | | | PWRC |
| 4272 | WSPX | Wheelstar Corporation | | | RSRV |
| 4273 | WSPX | WHEELSTAR CORP. | | | SCAC4 |
| 4274 | WSPY | WHITE STAR PUMP COMPANY LTD | | | SCAC4 |
| 4275 | WSQI | WILSON, STEWART P INC | | | SCAC4 |
| 4276 | WSQP | WALL STREET TRANSPORTATION INC | | | SCAC4 |
| 4277 | WSQR | WESTAR TRANSPORTATION INC | | | SCAC4 |
| 4278 | WSR | Canadian Helicopters | Callsign: Whistler, | CDN | AVCODES |
| 4279 | WSR | Warren & Sabine River R.R. Co. | 1/1975-1/1994; eliminated 1/1999; 7/2000-7/2005 | | NAKINA |
| 4280 | WSR | Warren & Sabine River R.R. Co. | 1/75-1/94; eliminated 1/99; 7/2000 | | NRHS |
| 4281 | WSR | WARREN & SABINE RIVER RAILROAD CO. | | | PWRC |
| 4282 | WSR | Warren and Saline River Railroad | | | RSRV |
| 4283 | WSRA | WESTERN RANCH | | | SCAC4 |
| 4284 | WSRB | W SILVER RECYCLING INC | | | SCAC4 |
| 4285 | WSRC | WISCONSIN & SOUTHERN RAILWAY CO. | | | PWRC |
| 4286 | WSRE | WEST, R E | | | SCAC4 |
| 4287 | WSRF | WESTERN REFRIGERATED FREIGHT SYSTEM | | | SCAC4 |
| 4288 | WSRG | W S TRUCKING | | | SCAC4 |
| 4289 | WSRI | WEST EXPRESS INC | | | SCAC4 |
| 4290 | WSRK | WESTERN SKYLIGHTS | | | SCAC4 |
| 4291 | WSRO | WESTAR TRANSPORT | | | SCAC4 |
| 4292 | WSRQ | WORLD STAR TRANSPORT | | | SCAC4 |
| 4293 | WSRR | WESTERN STATES TRANSPORTATION SERVI | | | SCAC4 |
| 4294 | WSRS | WATERFRONT SERVICES INC | | | SCAC4 |
| 4295 | WSRX | White Star Refining Co. | 7/1923-7/1932 | | NAKINA |
| 4296 | WSRX | White Star Refining Co. (Socony-Vacuum Oil Co., Inc., White Star-Ohio Division) | 7/1935 | | NAKINA |
| 4297 | WSRX | Socony-Vacuum Oil Co., Inc., White Star-Ohio Division | 7/1935-1/1945 | | NAKINA |
| 4298 | WSRX | Socony-Vacuum Oil Co., Inc., White Star Division | 1/1946-4/1947 | | NAKINA |
| 4299 | WSRX | Socony-Vacuum Oil Co., Inc., White Star-Ohio Division | Apr-38 | | NRHS |
| 4300 | WSRX | SOCONY-VACUUM OIL CO., WHITE STAR DIV. | | | PWRC |
