| 901 | WCOV | WASHINGTON COURIER | | | SCAC4 |
| 902 | WCP | Primaris Airlines, Inc. | IATA: FE, Founded in 2002. Commenced operations on 01 June 2004. Filed for Chapter 11 Bankruptcy protection on 10 October 2008. Ceased operations in November 2008. Designator FE reinstated by IATA | USA | AVCODES |
| 903 | WCP | Aviator College of Aeronautical Science and Technology | Callsign: Whitecap, | USA | AVCODES |
| 904 | WCP | Primaris Airlines | IATA: FE | | ICAO1 |
| 905 | WCPG | WEST COAST PIANO MOVING & STORAGE L | | | SCAC4 |
| 906 | WCPM | WESTERN CENTRAL PETROLEUM INC | | | SCAC4 |
| 907 | WCPX | Walker Consolidated Petroleum Co. | 7/1923 | | NAKINA |
| 908 | WCPX | Wayne Chemical Products Co., Division of Wayne Soap Co. | 4/1947-1/1950 | | NAKINA |
| 909 | WCPX | *WALKER CONSOLIDATED PETROLEUM CO. | | | PWRC |
| 910 | WCPX | *WAYNE CHEMICAL PRODUCTS CO., DIV. WAYNE SOAP CO. | | | PWRC |
| 911 | WCQ | Wisconsin Central Ltd. | 1/1994-7/2005 | | NAKINA |
| 912 | WCQ | Wisconsin Central Ltd. | 1/94-7/2000 | | NRHS |
| 913 | WCQ | (WC) WISCONSIN CENTRAL LTD. | | | PWRC |
| 914 | WCQ | Wisconsin Central Limited | | | RSRV |
| 915 | WCR | West Caribbean Costa Rica, S.A. | IATA: 0W, Callsign: West Caribbean, IATA Prefix: 791, Designator 0W recalled by IATA | CR | AVCODES |
| 916 | WCR | West Caribbean Costa Rica | | | ICAO1 |
| 917 | WCR | WASHINGTON COUNTY RAILROAD CO. | | | PWRC |
| 918 | WCR | West Coast Railways | | AUS | TRAFFIC |
| 919 | WCR | West Coast Railway Company Limited | | UK | VKM |
| 920 | WCRC | Washington Central R.R. Co., Inc. | added 1/1987; 1/1994; eliminated 10/1997 | | NAKINA |
| 921 | WCRC | Columbia Basin R.R. Co., Inc. | added 10/1997; 7/2000-7/2005 | | NAKINA |
| 922 | WCRC | Washington Central R.R. Co., Inc. | added 1/87; 1/94; eliminated 10/97 | | NRHS |
| 923 | WCRC | Columbia Basin R.R. Co., Inc. | added 10/97; 7/2000 | | NRHS |
| 924 | WCRC | COLUMBIA BASIN RAILROAD COMPANY [WASHINGTON CENTRAL RAILROAD CO.] | | | PWRC |
| 925 | WCRC | Washington Central Railroad | | | RSRV |
| 926 | WCRC | West Coast Railway Company Ltd | Real: WCR | GB | TRAFFIC |
| 927 | WCRD | WESTCAN RAIL LTD | | | SCAC4 |
| 928 | WCRE | WINESECRETS | | | SCAC4 |
| 929 | WCRL | West Chester R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 930 | WCRL | West Chester R.R. Co. | Jul-00 | | NRHS |
| 931 | WCRL | WEST CHESTER RAILROAD CO. | | | PWRC |
| 932 | WCRL | West Chester Railroad | | | RSRV |
| 933 | WCRL | WEST CHESTER RAILROAD CO | | | SCAC4 |
| 934 | WCRL | West Chester R.R. Co. | | USA | TRAFFIC |
| 935 | WCRN | WEST CONTAINER REPAIR INC | | | SCAC4 |
| 936 | WCRR | WISCONSIN CENTRAL LIMITED | | | SCAC1 |
| 937 | WCRR | Washington Central R.R. Co., Inc. | Real: WRCR | USA | TRAFFIC |
| 938 | WCRT | WEST COAST REDUCTION LTD | | | SCAC4 |
| 939 | WCRX | West Coast Resources, Inc. | added 1/1972; 1/1975; eliminated 10/1975 | | NAKINA |
| 940 | WCRX | United Grain Corp. | added 10/1975; 1/1980; eliminated 4/1989 | | NAKINA |
| 941 | WCRX | West Coast Resources, Inc. | added 1/72; 1/75 | | NRHS |
| 942 | WCRX | United Grain Corp. | 1/80; eliminated 4/89 | | NRHS |
| 943 | WCRX | UNITED GRAIN CORP. [WEST COAST RESOURCES, INC.] | | | PWRC |
| 944 | WCRX | West Coast Resources (United Grain Corporation) | | | RSRV |
| 945 | WCRY | WESTCAN RECYCLERS LTD | | | SCAC4 |
| 946 | WCS | Wagon Center Süd GmbH | | AT | VKM |
| 947 | WCSA | WORLD CLASS SHIPPING INC | | | SCAC4 |
| 948 | WCSC | WEBB CHEMICAL SERVICE CORPORATION | | | SCAC4 |
| 949 | WCSE | WORLD COMMERCE SERVICES LLC | | | SCAC4 |
| 950 | WCSJ | WILLIAMS CRANE SERVICE INC | | | SCAC4 |
| 951 | WCSL | WRIGHT, CAROL SALES | | | SCAC4 |
| 952 | WCSN | WCS TRUCKING CO INC | | | SCAC4 |
| 953 | WCSU | WCS SANTANGELO GMBH | | D | BIC |
| 954 | WCSU | WCS WILHELMSBURGER CONTAINER SERVIC | | | SCAC4 |
| 955 | WCSW | WEST COAST SHIPPING INC | | | SCAC4 |
| 956 | WCSX | Wheelabrator Coal Services Co. | added 10/1985; 1/1994-7/2000; eliminated 4/2001 | | NAKINA |
| 957 | WCSX | Savage-Tolk Energy Services | added 4/2001; eliminated 4/2004 | | NAKINA |
| 958 | WCSX | General Electric Railcar Services | added 4/2004; 7/2005 | | NAKINA |
| 959 | WCSX | Wheelabrator Coal Services Co. | 1/94-7/2000; eliminated 4/2001 | | NRHS |
| 960 | WCSX | Savage-Tolk Energy Services | added 4/2001 | | NRHS |
| 961 | WCSX | GENERAL ELECTRIC RAIL SERVICES (SAVAGE-TOLK ENERGY SERVICES [WHEELABRATOR COAL SERVICES]) | | | PWRC |
| 962 | WCSX | Savage-Tolk Energy Services (GE Rail Services) | | | RSRV |
| 963 | WCSX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 964 | WCSY | WORLD CARTAGE SYSTEMS LTD | | | SCAC4 |
| 965 | WCSZ | WASTE CONTROL SPECIALIST, LLC | | | PWRC |
| 966 | WCTA | WINSCARR TRANSPORT INC | | | SCAC4 |
| 967 | WCTB | WEST COAST TRANSPORTATION | | | SCAC4 |
| 968 | WCTD | W C TRANSPORT INC | | | SCAC4 |
| 969 | WCTF | WEST COAST TURF | | | SCAC4 |
| 970 | WCTG | WHITE CHRISTMAS TREE FARM | | | SCAC4 |
| 971 | WCTH | W C T CORP | | | SCAC4 |
| 972 | WCTI | WEST COAST TANK LINES | | | SCAC4 |
| 973 | WCTJ | WC TRUCKING INC | | | SCAC4 |
| 974 | WCTK | WEST COAST TRUCKING INC | | | SCAC4 |
| 975 | WCTM | WORLD CARGO TRANSPORT INC | | | SCAC4 |
| 976 | WCTR | WCTU Ry. Co. | added 4/1975; 1/1980-7/2005 | | NAKINA |
| 977 | WCTR | WCTU Ry. Co. | added 4/75; 1/80-7/2000 | | NRHS |
| 978 | WCTR | WCTU RAILWAY COMPANY | | | PWRC |
| 979 | WCTR | WCTU Railway (Rogue Valley Terminal Railroad) | | | RSRV |
| 980 | WCTR | WEST COAST TRANSPORTATION | | | SCAC4 |
| 981 | WCTT | WEST COAST TRUCK & TRAILER REPAIR I | | | SCAC4 |
| 982 | WCTU | WIENCONT CONTAINERTERMINAL GMBH | | A | BIC |
| 983 | WCTU | *RETIRED 05-17-94 FXD | | | PWRC |
| 984 | WCTU | *WCTU RAILWAY COMPANY [WHITE CITY TERMINAL & UTILITY CO.] | | | PWRC |
| 985 | WCTU | WCTU Railway (Wiencont Management) | | | RSRV |
| 986 | WCTU | WIENCONT CONTAINERTERMINA GMBH | | | SCAC4 |
| 987 | WCTW | WECARE TRANSPORTATION LLC | | | SCAC4 |
| 988 | WCTX | R.J. Roesling & Co. | 1/1952; eliminated 7/1953 | | NAKINA |
| 989 | WCTX | West Central Cooperative | added 4/1980; eliminated 4/1990 | | NAKINA |
| 990 | WCTX | Resource Recycling Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 991 | WCTX | R.J. Roesling & Co. | Jan-52 | | NRHS |
| 992 | WCTX | West Central Cooperative | added 4/80; eliminated 4/90 | | NRHS |
| 993 | WCTX | Resource Recycling Inc. | Jul-00 | | NRHS |
| 994 | WCTX | *R. J. ROESLING & CO. | | | PWRC |
| 995 | WCTX | *WEST CENTRAL COOPERATIVE | | | PWRC |
| 996 | WCTX | *WEHERHAUSER WOODS RAILROAD | | | PWRC |
| 997 | WCTX | +RESOURCE RECYCLING INC. | | | PWRC |
| 998 | WCTX | West Central Cooperative | | | RSRV |
| 999 | WCTX | WASTE CONVERSION TECHNOLOGIES INC | | | SCAC4 |
| 1000 | WCTY | WEST COAST TRANSPORTATION | | | SCAC4 |
