| 3201 | KMBE | KAMBER ENTERPRISES | | | SCAC3 |
| 3202 | KMBG | KIMBROUGH, MAX TRANSPORTS INC | | | SCAC3 |
| 3203 | KMBH | KMB TRANSPORT LTD | | | SCAC3 |
| 3204 | KMBI | KAMBRI EXPRESS INC | | | SCAC3 |
| 3205 | KMBK | K & M BARK AND SAWDUST INC | | | SCAC3 |
| 3206 | KMBM | KMB TRANSPORT | | | SCAC4 |
| 3207 | KMBN | KMB TRUCKING INC | | | SCAC4 |
| 3208 | KMBO | KIM BROTHERS TRANSPORTATION | | | SCAC3 |
| 3209 | KMBR | KIMBERLIN, CARL | | | SCAC3 |
| 3210 | KMBR | KIMBRELL FARMS | | | SCAC4 |
| 3211 | KMBS | KONICA MINOLTA BUSINESS SOLUTIONS U | | | SCAC4 |
| 3212 | KMBT | KIMBER, THOMAS | | | SCAC3 |
| 3213 | KMBU | KAMBARA KISEN CO LTD | | J | BIC |
| 3214 | KMBU | KAMBARA KISE | | | SCAC4 |
| 3215 | KMBX | Keilman Brothers | 10/1957 (not listed) | | NAKINA |
| 3216 | KMBX | Keilman Brothers | Oct-57 | | NRHS |
| 3217 | KMBX | KEILMAN BROTHERS | | | PWRC |
| 3218 | KMC | Kahama Mining Corporation | Callsign: Kahama, | EAT | AVCODES |
| 3219 | KMC | Kahama Mining Corporation | | | ICAO1 |
| 3220 | KMCD | KMC TRADING | | | SCAC3 |
| 3221 | KMCI | KODIAK MOTOR CARRIER INC | | | SCAC3 |
| 3222 | KMCM | K M CONSTRUCTION | | | SCAC4 |
| 3223 | KMCO | KEMCO TRUCKING, INC | | | SCAC3 |
| 3224 | KMCP | K M C TRANSPORTATION INC | | | SCAC4 |
| 3225 | KMCT | KMC TRANSPORT INC | | | SCAC3 |
| 3226 | KMCT | K, MICHAEL TRUCKING | | | SCAC4 |
| 3227 | KMCU | KMARIN OCEAN LOGISTICS (KOL) | | ROK | BIC |
| 3228 | KMCU | MITSUI O.S.K. LINES, LTD | | | PWRC |
| 3229 | KMCU | Mitsui O.S.K. Lines | | | RSRV |
| 3230 | KMCU | KENNECOTT GREENS CREEK MINING CO | | | SCAC4 |
| 3231 | KMCW | KEOJE MARINE CO LTD | | | SCAC4 |
| 3232 | KMCX | Kerr-McGee Coal Corp. | added 1/1995; eliminated 7/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 3233 | KMCX | Kerr-McGee Chemical Corp. | reporting marks changed from APMX 1/1971; eliminated 11/1973; added 11/1977; 1/1980; eliminated 4/1993; added 10/1993; 1/1994; eliminated 1/1995 | | NAKINA |
| 3234 | KMCX | Knappen Milling Co. | added 7/1964; 7/1965-10/1966; eliminated 7/1968 | | NAKINA |
| 3235 | KMCX | Knappen Milling Co. | added 7/64; 7/65-10/66; eliminated 7/68 | | NRHS |
| 3236 | KMCX | Kerr-McGee Chemical Corp. | reporting marks changed from APMX 1/71; eliminated 11/73; 1/80; eliminated 4/93; added 10/93; 1/94; eliminated 1/95 | | NRHS |
| 3237 | KMCX | Kerr-McGee Coal Corp. | added 1/95; eliminated 7/98; 7/2000 | | NRHS |
| 3238 | KMCX | *KNAPPEN MILLING CO. | | | PWRC |
| 3239 | KMCX | +KERR-MCGEE COAL CORPORATION | | | PWRC |
| 3240 | KMCX | Kerr-Mcgee Coal Corporation | | | RSRV |
| 3241 | KMCX | KNAPPEN MILLING CO | | | SCAC3 |
| 3242 | KMCZ | KELLERMEYER COMPANY | | | PWRC |
| 3243 | KMD | Kutnohorská místní dráha o.s. | | CZ | VKM |
| 3244 | KMDI | K M D INC | | | SCAC3 |
| 3245 | KMDI | KINGSWOOD MILLWORK & DESIGN INC | | | SCAC4 |
| 3246 | KMDM | KMD MARINE INC | | | SCAC3 |
| 3247 | KMDM | KMD MARINE INC | | | SCAC4 |
| 3248 | KMDQ | KAMDEN INTERNATIONAL SHIPPING INC. | | | SCAC3 |
| 3249 | KMDS | KAPITAN MANFRED DRAXL SCHIFFAHRTS G | | | SCAC4 |
| 3250 | KMDT | K & M DISTRIBUTION INC | | | SCAC4 |
| 3251 | KMDW | KBT TRANSPORT LLC | | | SCAC4 |
| 3252 | KME | Cambodia Airways Co., Ltd. | IATA: KR, Callsign: Giant Ibis, Commence operations on 10 July 2018. | K | AVCODES |
| 3253 | KME | KANSAS MISSOURI ELEVATOR | | | PWRC |
| 3254 | KMED | K & M EXPEDITING INC | | | SCAC4 |
| 3255 | KMEI | KOUROS MARITIME ENTERPRISES INC | | | SCAC4 |
| 3256 | KMEP | KM EXPRESS | | | SCAC4 |
| 3257 | KMER | KIMMEL, ERVIN H | | | SCAC3 |
| 3258 | KMES | KRONEMAN EXPRESS INC | | | SCAC4 |
| 3259 | KMET | KINGSTON MARITIME ENTERPRISES (UK) | | | SCAC3 |
| 3260 | KMEU | K LINE | | | PWRC |
| 3261 | KMEU | K Line | | | RSRV |
| 3262 | KMEU | K LINE (KAWASAKI KISEN KAISHA LTD) | | | SCAC3 |
| 3263 | KMEU | K LINE (KAWASAKI KISEN KAISHA LTD) | | | SCAC4 |
| 3264 | KMEX | KOCH METHANOL LLC | | | SCAC4 |
| 3265 | KMEZ | KERR MCGEE CHEMICAL CORP. | | | PWRC |
| 3266 | KMF | Kam Air | IATA: RQ, Callsign: Kamgar, IATA Prefix: 384, | AFG | AVCODES |
| 3267 | KMF | Kam Air | IATA: RQ | | ICAO1 |
| 3268 | KMFC | KISCO MANUFACTURING CORPORATION | | | SCAC4 |
| 3269 | KMFH | KOUBENEC MOTOR FREIGHT INC | | | SCAC3 |
| 3270 | KMFM | KD MAILING & FULFILLMENT | | | SCAC4 |
| 3271 | KMFR | KARLS MOTOR FREIGHT INC | | | SCAC4 |
| 3272 | KMFT | KMF TRANSPORT | | | SCAC4 |
| 3273 | KMFX | Kaolin Mushroom Farms, Inc. | added 1/1974; 1/1975 | | NAKINA |
| 3274 | KMFX | Kaolin Mushroom Farms, Inc. | added 1/74; 1/75 | | NRHS |
| 3275 | KMFX | KAOLIN MUSHROOM FARMS, INC. | | | PWRC |
| 3276 | KMFX | Kaolin Mushroom Farms | | | RSRV |
| 3277 | KMG | Kosmas Air | Callsign: Kosmas Cargo, Founded in 2004. AOC revoked in May 2008 | BIH | AVCODES |
| 3278 | KMG | Kosmas Air | | | ICAO1 |
| 3279 | KMGI | K M G INC | | | SCAC4 |
| 3280 | KMGM | KAMIGUMI CO LTD | | | SCAC4 |
| 3281 | KMGS | KNOWLTON MOVING SERVICE CORP | | | SCAC3 |
| 3282 | KMGS | KEARNEY MOVING SERVICE | | | SCAC4 |
| 3283 | KMGW | KIMBLE, GREGORY W | | | SCAC3 |
| 3284 | KMGW | K M G BERNUTH INC | | | SCAC4 |
| 3285 | KMGX | Twin Mountain Rock Co. | added 7/1991; 1/1994; eliminated 1/1997 | | NAKINA |
| 3286 | KMGX | Twin Mountain Rock Co. | added 7/91; 1/94; eliminated 1/97 | | NRHS |
| 3287 | KMGX | TWIN MOUNTAIN ROCK COMPANY | | | PWRC |
| 3288 | KMHG | K & M HAULING | | | SCAC4 |
| 3289 | KMHM | KISER MACHINERY MOVING | | | SCAC3 |
| 3290 | KMI | K-Mile Air Co. Ltd. | IATA: 8K, | T | AVCODES |
| 3291 | KMI | K-Mile Air | | | ICAO1 |
| 3292 | KMIC | KELRON MONTREAL INC | | | SCAC4 |
| 3293 | KMIE | KAMME | | | SCAC4 |
| 3294 | KMIL | KIRNEY, MICHAEL | | | SCAC4 |
| 3295 | KMIM | K & M INC | | | SCAC4 |
| 3296 | KMIN | K & M INDUSTRIES LTD | | | SCAC3 |
| 3297 | KMIO | KODIAK MOTORSPORTS INC | | | SCAC4 |
| 3298 | KMIQ | KORIMA INC | | | SCAC4 |
| 3299 | KMIS | KENDRICK MOVING & STORAGE INC (DIV | | | SCAC3 |
| 3300 | KMIS | KENDRICK, J HERSCHEL MOVING & STORA | | | SCAC4 |
