| 15201 | CS | Burlington Northern Santa Fe Ry. Co. | 7/2000; eliminated 4/2005 | | NAKINA |
| 15202 | CS | Burlington Northern R.R. Co. | added 4/1982; 1/1994 | | NAKINA |
| 15203 | CS | The Colorado and Southern Ry. Co. | 1/1975-1/1980; eliminated 4/1982 | | NAKINA |
| 15204 | CS | The Colorado and Southern Ry. Co. | 1/75-1/80; eliminated 4/82 | | NRHS |
| 15205 | CS | Burlington Northern R.R. Co. | added 4/82; 1/94 | | NRHS |
| 15206 | CS | Burlington Northern Santa Fe Ry. Co. | Jul-00 | | NRHS |
| 15207 | CS | BNSF [BURLINGTON NORTHERN RAILROAD CO; COLORADO & SOUTHERN] | | | PWRC |
| 15208 | CS | Colorado and Southern Railway (BNSF Railway) | | | RSRV |
| 15209 | CS | The Colorado and Southern Ry. Co. | | USA | TRAFFIC |
| 15210 | CSA | Czech Airlines A.S. , CSA | IATA: OK, Callsign: CSA-Lines, IATA Prefix: 064, | CZ | AVCODES |
| 15211 | CSA | Ceskoslovenske Aerolinie (CSA) | IATA: OK, Callsign: CSA-Lines, IATA Prefix: 064, | CS | AVCODES |
| 15212 | CSA | Czech Airlines | IATA: OK | | ICAO1 |
| 15213 | CSA | Ceskoslovenske Aerolinie | | CS | TRAFFIC |
| 15214 | CSAB | CASTANARES, ALBERTO G | | | SCAC3 |
| 15215 | CSAB | CUSTOM ASSEMBLY INCORPORATED | | | SCAC4 |
| 15216 | CSAC | CENTRAL STATES TRUCKING CO | | | SCAC3 |
| 15217 | CSAC | CENTRAL STATES TRUCKING CO | | | SCAC4 |
| 15218 | CSAD | CASCADE TRANSPORT INC | | | SCAC3 |
| 15219 | CSAD | CASCADE TRANSPORT INC | | | SCAC4 |
| 15220 | CSAD | | | CS | TRAFFIC |
| 15221 | CSAE | C & S CARTAGE INC | | | SCAC3 |
| 15222 | CSAG | CONECUH SAUSAGE COMPANY INC | | | SCAC4 |
| 15223 | CSAH | COSTA TRUCK LINES | | | SCAC3 |
| 15224 | CSAH | CARUSO TRUCKING LLC | | | SCAC4 |
| 15225 | CSAI | C S A TRANSPORT INC | | | SCAC3 |
| 15226 | CSAJ | C S & J TRUCKING INC | | | SCAC3 |
| 15227 | CSAK | COSTA, TIM TRUCKING | | | SCAC3 |
| 15228 | CSAL | CUSTOM ALUMINUM INC | | | SCAC4 |
| 15229 | CSAN | CASTAN TRUCKING INC | | | SCAC3 |
| 15230 | CSAN | CASTAN INC | | | SCAC4 |
| 15231 | CSAO | CONRAIL SHARED ASSETS OPERATIONS | | | PWRC |
| 15232 | CSAO | CROSSBORDER EXPRESS | | | SCAC4 |
| 15233 | CSAP | CONTINENTAL SYSTEMS & CONCEPTS INC | | | SCAC3 |
| 15234 | CSAP | CONTINENTAL SYSTEMS & CONCEPTS INC | | | SCAC4 |
| 15235 | CSAQ | COLD STORAGE TRUCKING | | | SCAC3 |
| 15236 | CSAQ | COSTA TRANSPORT LLC | | | SCAC4 |
| 15237 | CSAR | COASTAL ARMORED CAR SERVICE INC | | | SCAC3 |
| 15238 | CSAR | CAVAZOS ALANIS, EDGAR | | | SCAC4 |
| 15239 | CSAT | CENTRAL STORAGE & TRANSFER CO | | | SCAC3 |
| 15240 | CSAT | CENTRAL STORAGE & TRANSFER CO | | | SCAC4 |
| 15241 | CSAU | CORPORATIVO DE SERVICIOS AMBIENTALES S.A DE C.V | | MEX | BIC |
| 15242 | CSAU | COSTA LINE | | | PWRC |
| 15243 | CSAU | Costa Line | | | RSRV |
| 15244 | CSAU | CONTAINER SERVICE 'AMSTERDAM' | | | SCAC3 |
| 15245 | CSAU | CORSA | | | SCAC4 |
| 15246 | CSAV | SUDAMERICANA DE VAPORES | | | SCAC1 |
| 15247 | CSAV | COASTAL AVIATION | | | SCAC4 |
| 15248 | CSAX | Crucible Steel Co. of America | 7/1923; 1/1943-7/1954; eliminated 7/1956 | | NAKINA |
| 15249 | CSAX | Crucible Steel Co. of America | 1/52; eliminated 7/56 | | NRHS |
| 15250 | CSAX | CRUCIBLE sTEEL CO,. OF AMERICA | | | PWRC |
| 15251 | CSAY | CASSIDY, ALLEN TRUCKING | | | SCAC3 |
| 15252 | CSAY | CASSIDY, ALLEN TRUCKING | | | SCAC4 |
| 15253 | CSB | Air Commerce | Callsign: Air Commerce, | BIH | AVCODES |
| 15254 | CSB | 21 Air LLC | IATA: 2I, Callsign: Cargo South, IATA Prefix: 681, Founded on 25 February 2014. | USA | AVCODES |
| 15255 | CSBB | C & S CHARTER | | | SCAC3 |
| 15256 | CSBB | COMPRA Y VENTA DE METALES ROSAS | | | SCAC4 |
| 15257 | CSBC | COLLINS, S B INC | | | SCAC4 |
| 15258 | CSBD | CONSTELLATION SHIPPING LTD BERMUDA | | | SCAC3 |
| 15259 | CSBE | CONTRERAS, BERNARDO S | | | SCAC3 |
| 15260 | CSBE | CUSTOMER SPECIFIC CABLES S A DE C V | | | SCAC4 |
| 15261 | CSBG | COLONIAL SURFACE SOLUTIONS INC | | | SCAC4 |
| 15262 | CSBH | CSI TRUCKING | | | SCAC3 |
| 15263 | CSBI | CROSBY TRUCKING SERVICE INC | | | SCAC3 |
| 15264 | CSBI | CROSBY TRUCKING SERVICE INC | | | SCAC4 |
| 15265 | CSBK | C & S BROKER | | | SCAC4 |
| 15266 | CSBL | CUSTER, BILL | | | SCAC3 |
| 15267 | CSBM | CLOSE BUILDING MATERIALS INC | | | SCAC3 |
| 15268 | CSBM | CANTRAN ENTERPRISES LTD | | | SCAC4 |
| 15269 | CSBN | CAUSEY BUS SERVICE | | | SCAC3 |
| 15270 | CSBO | CROSBY & OVERTON TRANSPORTATION COM | | | SCAC3 |
| 15271 | CSBP | CASEY BROKERAGE INC | | | SCAC4 |
| 15272 | CSBQ | COSBY TRANSFER & STORAGE CORP | | | SCAC3 |
| 15273 | CSBQ | CARGOWAYS WAREHOUSI | | | SCAC4 |
| 15274 | CSBR | CARLSON, ROBERT M TRUCKING INC | | | SCAC3 |
| 15275 | CSBR | CUSTARD STAND FOOD PRODUCTS, LLC | | | SCAC4 |
| 15276 | CSBS | CSC TRANSPORT INC | | | SCAC4 |
| 15277 | CSBT | CASTLE OIL CORPORATION | | | SCAC4 |
| 15278 | CSBV | CIRCLE STAR TRANSPORT | | | SCAC4 |
| 15279 | CSBW | COSBY, W G TRANSFER & STORAGE | | | SCAC3 |
| 15280 | CSBX | Cargill, Inc. — Salt Division | added 4/1998; 7/2000-7/2005 | | NAKINA |
| 15281 | CSBX | Cargill, Inc. -- Salt Division | added 4/98; 7/2000 | | NRHS |
| 15282 | CSBX | CARGILL INCORPORATED - SALT DIVISION | | | PWRC |
| 15283 | CSBX | Cargill Salt Division | | | RSRV |
| 15284 | CSBX | CARGILL INC (SALT DIVISION) | | | SCAC4 |
| 15285 | CSBY | C & S TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 15286 | CSC | Sichuan Airlines Co. Ltd. | IATA: N8, Callsign: Chuanhang, IATA designator changed to 3U | PRC | AVCODES |
| 15287 | CSC | Caribbean Skyways St. Lucia Express | IATA: SL, Callsign: St. Lucia Express, | WL | AVCODES |
| 15288 | CSC | Sichuan Airlines Co. Ltd. | IATA: 3U, Callsign: Sichuan, IATA designator changed from N8 | PRC | AVCODES |
| 15289 | CSC | Sichuan Airlines | IATA: 3U | | ICAO1 |
| 15290 | CSC | CHICAGO SIGHTSEEING COMPANY INC | | | SCAC4 |
| 15291 | CSCA | CHESTER CARTAGE LTD | | | SCAC4 |
| 15292 | CSCB | CASCO BAY LINES | | | SCAC3 |
| 15293 | CSCC | C&S CARTAGE | | | SCAC3 |
| 15294 | CSCD | Cascade and Columbia River R.R. Co. | added 10/1999; 7/2000-7/2005; eliminated 4/2006 | | NAKINA |
| 15295 | CSCD | Cascade and Columbia River R.R. Co. | added 10/99; 7/2000 | | NRHS |
| 15296 | CSCD | CASCADE & COLUMBIA RIVER RAILROAD | | | PWRC |
| 15297 | CSCD | Cascade and Columbia River Railroad | | | RSRV |
| 15298 | CSCD | CASCADE AND COLUMBIA RIVER RAILROAD | | | SCAC4 |
| 15299 | CSCE | C & S COACHES | | | SCAC3 |
| 15300 | CSCE | CONTRACTORS SERVICE COMPANY INC | | | SCAC4 |
