| 5201 | KTBJ | KINGSTON TRANSPORTATION LLC | | | SCAC4 |
| 5202 | KTBK | KULLANGI TRANSPORTATION & BROKERAGE | | | SCAC4 |
| 5203 | KTBL | KITCHEN, B L TRANSPORTATION | | | SCAC4 |
| 5204 | KTBO | KALIJAH TRANSPORT | | | SCAC4 |
| 5205 | KTBR | K T L INC | | | SCAC4 |
| 5206 | KTBT | KENT BROS TRANSPORTATION | | | SCAC3 |
| 5207 | KTBV | KEVCO TRUCKING INC | | | SCAC4 |
| 5208 | KTC | Kyrgyz Trans Avia Ltd. Airline | IATA: 6K, Ceased operations. | KS | AVCODES |
| 5209 | KTC | Kyrgyz Trans Avia | | | ICAO1 |
| 5210 | KTCC | KAYCO TRUCKING CO INC | | | SCAC3 |
| 5211 | KTCF | KELLEY TRUCKING COMPANY LLC | | | SCAC4 |
| 5212 | KTCG | KENYA TRUCKING COMPANY LLC - KENATC | | | SCAC4 |
| 5213 | KTCH | KITCHELL, JOAN | | | SCAC3 |
| 5214 | KTCH | KITCHENS M R S INC | | | SCAC4 |
| 5215 | KTCI | KTC INC | | | SCAC3 |
| 5216 | KTCK | KTC INC | | | SCAC3 |
| 5217 | KTCL | KONOIKE TRANSPORTATION CO. LTD. | | | SCAC3 |
| 5218 | KTCL | KELLEY TRANSIT COMPANY | | | SCAC4 |
| 5219 | KTCM | KENNTORR TRUCKING COMPANY LLC | | | SCAC4 |
| 5220 | KTCO | KETCO TRUCKING CO INC | | | SCAC3 |
| 5221 | KTCO | K T C T | | | SCAC4 |
| 5222 | KTCP | KIMOLOS TANKER CORPORATION | | | SCAC4 |
| 5223 | KTCQ | KENTON TRANSFER CO | | | SCAC3 |
| 5224 | KTCQ | KIRBY TRANS CORP | | | SCAC4 |
| 5225 | KTCR | K-T CONTRACT SERVICES INC | | | SCAC3 |
| 5226 | KTCR | KTC | | | SCAC4 |
| 5227 | KTCS | KITCHUCK & SON | | | SCAC3 |
| 5228 | KTCS | K-T CONTRACT SERVICES | | | SCAC4 |
| 5229 | KTCT | K T C TRANSPORT INC | | | SCAC3 |
| 5230 | KTCT | KATCO TRANSPORT INC | | | SCAC4 |
| 5231 | KTCU | AEROSOL GAS COMPANY, INC | | USA | BIC |
| 5232 | KTCU | KUSKOKWIM TRANSPORTATION CO. | | | SCAC3 |
| 5233 | KTCV | KITTU TRANSPORT INC | | | SCAC4 |
| 5234 | KTCW | KNOWLES TRUCKING COMPANY INC | | | SCAC4 |
| 5235 | KTCX | Klamath Gas Co. | added 7/1963; 7/1965-1/1975; eliminated 1/1980 | | NAKINA |
| 5236 | KTCX | Klamath Gas Co. | added 7/63; 7/65-1/75; eliminated 1/80 | | NRHS |
| 5237 | KTCX | KLAMATH GAS CO. | | | PWRC |
| 5238 | KTCX | KLAMATH GAS CO | | | SCAC3 |
| 5239 | KTCY | KEMP TRUCKING COMPANY INC | | | SCAC4 |
| 5240 | KTDA | KALKAVAN TRANSPORT DENIZCILIK A S | | | SCAC4 |
| 5241 | KTDC | KENT TRADING CORP. | | | SCAC3 |
| 5242 | KTDG | K & T DISTRIBUTING | | | SCAC3 |
| 5243 | KTDH | KHATAU TRANSPORT LTD | | | SCAC4 |
| 5244 | KTDL | KAPCO TOOL & DIE LTD | | | SCAC4 |
| 5245 | KTDU | CONDACO & KTD-M GMBH | | D | BIC |
| 5246 | KTDU | KTD MOBILBOX GMBH | | | SCAC4 |
| 5247 | KTEP | K-T EXPRESS INC | | | SCAC3 |
| 5248 | KTER | Kingston Terminal R.R. Corp. | added 7/1980; eliminated 10/1980 | | NAKINA |
| 5249 | KTER | Kingston Terminal R.R. Corp. | added 7/80; eliminated 10/80 | | NRHS |
| 5250 | KTER | KINGSTON TERMINAL RAILROAD CORP. | | | PWRC |
| 5251 | KTER | KINGSTON TERMINAL RAILROAD CORP | | | SCAC3 |
| 5252 | KTEU | SHARK, S.A | | P | BIC |
| 5253 | KTEZ | KOC CARBON TERMINAL | | | PWRC |
| 5254 | KTFC | KTF TRANSPORT INC | | | SCAC4 |
| 5255 | KTFI | KING TRANSFER & STORAGE COMPANY INC | | | SCAC3 |
| 5256 | KTFM | KITLEY, TROY FARMS | | | SCAC4 |
| 5257 | KTFN | KTF TRANSPORT INC | | | SCAC4 |
| 5258 | KTFQ | KING TRANSFER & STORAGE | | | SCAC3 |
| 5259 | KTFQ | KING TRANSFER & STORAGE LLC | | | SCAC4 |
| 5260 | KTFS | KERUDA TRAFFIC SERVICE INC | | | SCAC3 |
| 5261 | KTFU | JIANGSU BLUESTAR GREEN TECHNOLOGY CO., LTD. | | PRC | BIC |
| 5262 | KTGC | KIMS TRUCKING COMPANY | | | SCAC3 |
| 5263 | KTGC | KLASSY TRUCKING INC | | | SCAC4 |
| 5264 | KTGH | KINGS TRUCKING | | | SCAC3 |
| 5265 | KTGI | KTG TRANSPORTATION LINES INC | | | SCAC3 |
| 5266 | KTGN | KT-GRANT INC | | | SCAC4 |
| 5267 | KTGS | KRUEGER TRUCKING SERVICE INC | | | SCAC3 |
| 5268 | KTGS | KTS EXPRESS INC | | | SCAC4 |
| 5269 | KTGU | {LLP "KAZTECHGAS"};ZIPCODE=050031 | | KZ | BIC |
| 5270 | KTGU | KALI TRANSPORT CMBH | | | SCAC3 |
| 5271 | KTGW | KEENAN, J N TRUCKING | | | SCAC3 |
| 5272 | KTGX | Keystone Tanning & Glue Co. | 1/1943-1/1946 | | NAKINA |
| 5273 | KTGX | KEYSTONE TANNING & GLUE CO. | | | PWRC |
| 5274 | KTHE | KOTHE TRUCKING | | | SCAC4 |
| 5275 | KTHH | KITTLE HEAVY HAULING | | | SCAC3 |
| 5276 | KTHN | KAHL TRUCKING | | | SCAC4 |
| 5277 | KTHO | KITHNOS SHIPPING CORP | | | SCAC3 |
| 5278 | KTHQ | KEITH, DON E | | | SCAC3 |
| 5279 | KTHQ | KEITH, DON E | | | SCAC4 |
| 5280 | KTHT | KANTHAK TRUCKING | | | SCAC3 |
| 5281 | KTHV | KRAMERS TECHNICAL SERVICES INC | | | SCAC4 |
| 5282 | KTHY | KATHY-O-ESTATES INC | | | SCAC3 |
| 5283 | KTIA | KUEHL TRANSIT INC | | | SCAC4 |
| 5284 | KTIB | KTI | | | SCAC4 |
| 5285 | KTIC | KELLAWAY TRANSPORTATION INC | | | SCAC3 |
| 5286 | KTIC | KOMMITTED TRANSPORTATION INC | | | SCAC4 |
| 5287 | KTID | KTI LTD | | | SCAC4 |
| 5288 | KTIE | KILLPACK TRUCKING INC | | | SCAC4 |
| 5289 | KTIF | KATHERINE TRANSPORTATION INC | | | SCAC4 |
| 5290 | KTIG | KREGER TRUCKING | | | SCAC3 |
| 5291 | KTIG | KELLY TRAILERS INC | | | SCAC4 |
| 5292 | KTIH | KOSCH TRUCKING INC | | | SCAC4 |
| 5293 | KTIJ | K TRANS INC | | | SCAC4 |
| 5294 | KTIK | KIRTS TRUCKING INC | | | SCAC4 |
| 5295 | KTIL | KTI LLC | | | SCAC4 |
| 5296 | KTIN | KNOWLES TRANSPORT INC | | | SCAC3 |
| 5297 | KTIP | KAWARTHA TRANSPORT INC | | | SCAC4 |
| 5298 | KTIQ | KIRLEW TRUCKING INC | | | SCAC4 |
| 5299 | KTIS | KTI EXPRESS LLC | | | SCAC4 |
| 5300 | KTIT | KIDS TRUCKING INC, THE | | | SCAC4 |
