| 1 | WSR | Canadian Helicopters | Callsign: Whistler, | CDN | AVCODES |
| 2 | WSR | Warren & Sabine River R.R. Co. | 1/1975-1/1994; eliminated 1/1999; 7/2000-7/2005 | | NAKINA |
| 3 | WSR | Warren & Sabine River R.R. Co. | 1/75-1/94; eliminated 1/99; 7/2000 | | NRHS |
| 4 | WSR | WARREN & SABINE RIVER RAILROAD CO. | | | PWRC |
| 5 | WSR | Warren and Saline River Railroad | | | RSRV |
| 6 | WSRA | WESTERN RANCH | | | SCAC4 |
| 7 | WSRB | W SILVER RECYCLING INC | | | SCAC4 |
| 8 | WSRC | WISCONSIN & SOUTHERN RAILWAY CO. | | | PWRC |
| 9 | WSRE | WEST, R E | | | SCAC4 |
| 10 | WSRF | WESTERN REFRIGERATED FREIGHT SYSTEM | | | SCAC4 |
| 11 | WSRG | W S TRUCKING | | | SCAC4 |
| 12 | WSRI | WEST EXPRESS INC | | | SCAC4 |
| 13 | WSRK | WESTERN SKYLIGHTS | | | SCAC4 |
| 14 | WSRO | WESTAR TRANSPORT | | | SCAC4 |
| 15 | WSRQ | WORLD STAR TRANSPORT | | | SCAC4 |
| 16 | WSRR | WESTERN STATES TRANSPORTATION SERVI | | | SCAC4 |
| 17 | WSRS | WATERFRONT SERVICES INC | | | SCAC4 |
| 18 | WSRX | White Star Refining Co. | 7/1923-7/1932 | | NAKINA |
| 19 | WSRX | White Star Refining Co. (Socony-Vacuum Oil Co., Inc., White Star-Ohio Division) | 7/1935 | | NAKINA |
| 20 | WSRX | Socony-Vacuum Oil Co., Inc., White Star-Ohio Division | 7/1935-1/1945 | | NAKINA |
| 21 | WSRX | Socony-Vacuum Oil Co., Inc., White Star Division | 1/1946-4/1947 | | NAKINA |
| 22 | WSRX | Socony-Vacuum Oil Co., Inc., White Star-Ohio Division | Apr-38 | | NRHS |
| 23 | WSRX | SOCONY-VACUUM OIL CO., WHITE STAR DIV. | | | PWRC |
| 24 | WSRY | Winamac Southern Ry. Co. | 1/1994-7/2005 | | NAKINA |
| 25 | WSRY | Winamac Southern Ry. Co. | 1/94-7/2000 | | NRHS |
| 26 | WSRY | WINAMAC SOUTHERN RAILWAY CO. | | | PWRC |
| 27 | WSRY | Winamac Southern Railway | | | RSRV |
| 28 | WSRY | WINAMAC SOUTHERN RAILWAY COMPANY | | | SCAC4 |
| 29 | WSRZ | WISCONSIN & SOUTHERN RAILROAD CO. | | | PWRC |
| 30 | WSRZ | Wisconsin and Southern Railroad | | | RSRV |
