| 2001 | WHGP | WAH SING TRANSPORT INC | | | SCAC4 |
| 2002 | WHGR | WELCH, GEORGE TRUCKING | | | SCAC4 |
| 2003 | WHGS | WHG TRUCKING | | | SCAC4 |
| 2004 | WHGT | WHITTLINGTON TRANSPORT | | | SCAC4 |
| 2005 | WHGU | GE Heat Recovery Solutions | | | RSRV |
| 2006 | WHGU | CALNETIX POWER SOLUTIONS | | | SCAC4 |
| 2007 | WHH | Richy Slylark Pvt Ltd. | | CL | AVCODES |
| 2008 | WHHI | WESTERN HEAVY HAUL INC | | | SCAC4 |
| 2009 | WHHN | WHITEHORSE TRANSPORT INC | | | SCAC4 |
| 2010 | WHHO | WHITEHEAD OIL CO INC | | | SCAC4 |
| 2011 | WHI | Burlington Northern Inc. | added 10/1975; 1/1980; eliminated 7/1981 | | NAKINA |
| 2012 | WHI | Burlington Northern R.R. Co. | added 7/1981; eliminated 7/1985; added 10/1985; eliminated 4/1995 | | NAKINA |
| 2013 | WHI | Burlington Northern Inc. | 1/80; eliminated 7/81 | | NRHS |
| 2014 | WHI | Burlington Northern R.R. Co. | added 7/81; eliminated 4/95 | | NRHS |
| 2015 | WHI | BURLINGTON NORTHERN RAILROAD | | | PWRC |
| 2016 | WHI | BNSF Railway | | | RSRV |
| 2017 | WHIC | WHITE CO | | | SCAC4 |
| 2018 | WHID | WHIDBEY SEATAC SHUTTLE | | | SCAC4 |
| 2019 | WHIE | WHITENER ENTERPRISES INCORPORATED | | | SCAC4 |
| 2020 | WHIF | WHITFIELD OIL CO INC | | | SCAC4 |
| 2021 | WHIH | WHITEHURST TRANSPORT INC | | | SCAC4 |
| 2022 | WHIJ | WESTERN HIWAYS | | | SCAC4 |
| 2023 | WHIK | WILLIAMS HEATING INC | | | SCAC4 |
| 2024 | WHIM | WHIMSY INC | | | SCAC4 |
| 2025 | WHIN | WHIN EXPRESS INC | | | SCAC4 |
| 2026 | WHIP | WHIPCO TRUCKING | | | SCAC4 |
| 2027 | WHIR | WHITE INC | | | SCAC4 |
| 2028 | WHIT | WHITLEY FUEL L L C | | | SCAC4 |
| 2029 | WHITEB | White Bus Company | | US-NJ | TRAFFIC |
| 2030 | WHIX | Western Fruit Express Co. | 1/1950-1/1980; eliminated 1/1981 | | NAKINA |
| 2031 | WHIX | Western Fruit Express Co. | 1/52-1/80; eliminated 1/81 | | NRHS |
| 2032 | WHIX | WESTERN FRUIT EXPRESS CO. | | | PWRC |
| 2033 | WHIZ | WAH CHANG INDUSTRY | | | PWRC |
| 2034 | WHJ | Vittsjö - Hässleholm Järnväg | 1890 - 1897 | S | svenska-lok.se |
| 2035 | WHJA | WOODHOUSE, J A TRANSFER | | | SCAC4 |
| 2036 | WHJC | WHITE, JOHN R | | | SCAC1 |
| 2037 | WHJC | WHITE, JOHN R COMPANY INC | | | SCAC4 |
| 2038 | WHJI | WIEMER, HERMANN J VINEYARD INC | | | SCAC4 |
| 2039 | WHJO | WALKER, H J OIL COMPANY INC | | | SCAC4 |
| 2040 | WHJT | WHITE, JERRY TRUCKING | | | SCAC4 |
| 2041 | WHKA | WILHELM, KARL INC | | | SCAC4 |
| 2042 | WHKC | WHITAKER CONSTRUCTION INC | | | SCAC4 |
| 2043 | WHKD | WHITE HAWK TRANSPORT LTD | | | SCAC4 |
| 2044 | WHKE | WHITEHAWK ENTERPRISES LTD | | | SCAC4 |
| 2045 | WHKY | WHITE TRUCKING COMPANY LLC | | | SCAC4 |
| 2046 | WHL | Woodgate Air Services Limited | Callsign: Woodgate, | Z | AVCODES |
| 2047 | WHL | Welwyn-Hatfield Line | | GB | TRAFFIC |
| 2048 | WHLA | WILDERNESS HAULING LTD | | | SCAC4 |
| 2049 | WHLC | WAN HAI LINES LTD | | | SCAC4 |
| 2050 | WHLD | WARD, H L DRAYAGE CO | | | SCAC4 |
| 2051 | WHLE | WHEATLAND EXPRESS | | | SCAC4 |
| 2052 | WHLG | WHEELERS TRUCKING CO INC | | | SCAC4 |
| 2053 | WHLL | WHITEHALL CO LTD | | | SCAC4 |
| 2054 | WHLN | WHALENS MOVING & STORAGE | | | SCAC4 |
| 2055 | WHLO | WHITELINER COMPANY LTD | | | SCAC4 |
| 2056 | WHLR | WHEELER, RONALD W | | | SCAC4 |
| 2057 | WHLT | WALNUT HALL LTD | | | SCAC4 |
| 2058 | WHLU | WAN HAI LINES LTD | | RC | BIC |
| 2059 | WHLU | WAN HAI LINES LTD | | | SCAC4 |
| 2060 | WHLW | Luftwaffe | | D | TRAFFIC |
| 2061 | WHLY | WHITELEY TRUCKING LLC | | | SCAC4 |
| 2062 | WHLZ | FLEXI-VAN LEASING INC | | | SCAC4 |
| 2063 | WHMB | WOLFE HOUSE MOVERS LLC | | | SCAC4 |
| 2064 | WHMC | WILLIAMS, HAROLD MOVING CO | | | SCAC4 |
| 2065 | WHMR | WHITE MOUND TRANSFER | | | SCAC4 |
| 2066 | WHMS | WIGHTMAN, S & T | | | SCAC4 |
| 2067 | WHMT | WESTERN HOME TRANSPORT INC | | | SCAC4 |
| 2068 | WHMV | WE-HAUL MOVING | | | SCAC4 |
| 2069 | WHMX | Miner Enterprises | 1/1994 (not listed); added 1/1997; eliminated 4/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 2070 | WHMX | Miner Enterprises | 1/94; added 1/97; eliminated 4/97; 7/2000 | | NRHS |
| 2071 | WHMX | MINER ENTERPRISES | | | PWRC |
| 2072 | WHMX | Miner Enterprises | | | RSRV |
| 2073 | WHMX | MINER ENTERPRISES | | | SCAC4 |
| 2074 | WHMY | WHEELER, TIM TRUCKING LLC | | | SCAC4 |
| 2075 | WHN | Wharton and Northern R.R. Co. | 1/1975 | | NAKINA |
| 2076 | WHN | Consolidated Rail Corp. | 1/1980-1/1994 | | NAKINA |
| 2077 | WHN | Wharton and Northern R.R. Co. | Jan-75 | | NRHS |
| 2078 | WHN | Consolidated Rail Corp. | 1/80-1/94 | | NRHS |
| 2079 | WHN | CONSOLIDATED RAIL CORP. [WHARTON & NORTHERN RR.] | | | PWRC |
| 2080 | WHN | Wharton & Northern Railroad (Conrail) | | | RSRV |
| 2081 | WHNS | WAYNESBURG & SOUTHERN | | | PWRC |
| 2082 | WHNY | WHITNEY TRUCKING INC | | | SCAC4 |
| 2083 | WHOA | WHATLEY OIL & AUTO PARTS CO | | | SCAC4 |
| 2084 | WHOC | WHETSTONE OIL COMPANY | | | SCAC4 |
| 2085 | WHOE | Walking Horse and Eastern R.R. | added 7/1985; eliminated 10/1991; 1/1994-7/2005 | | NAKINA |
| 2086 | WHOE | Walking Horse and Eastern R.R. | eliminated 10/91; 1/94-7/2000 | | NRHS |
| 2087 | WHOE | WALKING HORSE & EASTERN RAILROAD CO., INC. | | | PWRC |
| 2088 | WHOE | Walking Horse and Eastern Railroad | | | RSRV |
| 2089 | WHOF | WHOLESALE FUELS INC | | | SCAC4 |
| 2090 | WHOG | WILD HOGS | | | SCAC4 |
| 2091 | WHOI | WOODS HOLE OCEANOGRAPHIC INSTITUTIO | | | SCAC4 |
| 2092 | WHOK | WHITESTOK TRUCKING LTD | | | SCAC4 |
| 2093 | WHOL | WHITE HOLLOW INC | | | SCAC4 |
| 2094 | WHON | WENDELL HONEY | | | SCAC4 |
| 2095 | WHOP | WHITE TRANSPORT LLC | | | SCAC4 |
| 2096 | WHOS | WAHOO LOGISTICS LLC | | | SCAC4 |
| 2097 | WHOX | White Oil Corp. | 8/1920-7/1923 | | NAKINA |
| 2098 | WHOX | WHITE OIL CORP. | | | PWRC |
| 2099 | WHPK | WELCH, HENRY P TRUCKING | | | SCAC4 |
| 2100 | WHPL | WAREHOUSE PLUS INC | | | SCAC4 |
