| 1 | ZC | Royal Swazi National Airways Corp. | ICAO: RSN, Callsign: Swazi National, IATA Prefix: 141, Designator ZC recalled by IATA | SD | AVCODES |
| 2 | ZC | Korongo Airlines sprl | ICAO: KGO, Callsign: Korongo, IATA Prefix: 557, Ceased operations on 04 September 2015. Founded 15 December 2009. Operations commenced 16 April 2012. | ZRE | AVCODES |
| 3 | ZC | NU-Aero (Pvt) Ltd t/a Fly Africa Zimbabwe | ICAO: FZW, Operations commenced on 01 August 2014. | ZW | AVCODES |
| 4 | ZC | Flyafrica Zimbabwe (PVT) Limited | ICAO: FZW, | ZW | AVCODES |
| 5 | ZC | Railway of the Democratic Peoples Republic of Korea (ЗЧ) | | KP | VKM |
| 6 | ZCAX | Zinc Corp. of America (previously St. Joe Minerals Corp., reporting marks SJMX) | added 10/1988; 1/1994-7/2000; eliminated 10/2002; 7/2005 (not listed) | | NAKINA |
| 7 | ZCAX | Zinc Corp. of America (previously St. Joe Minerals Corp., reporting marks SJMX) | added 10/88; 1/94-7/2000 | | NRHS |
| 8 | ZCAX | ZINC CORPORATION OF AMERICA (PREVIOUSLY ST. JOE MINERALS CORP., REPORTING MARK SJMX) | | | PWRC |
| 9 | ZCAX | Zinc Corporation of America | | | RSRV |
| 10 | ZCAX | ZINC CORPORATION OF AMERICA | | | SCAC4 |
| 11 | ZCCN | ZOLADZ CONSTRUCTION CO INC | | | SCAC4 |
| 12 | ZCCX | Zeigler Coal Co. | added 1/1979; 1/1980-1/1994; eliminated 7/1999; 7/2000-7/2005 (not listed) | | NAKINA |
| 13 | ZCCX | Zeigler Coal Co. | added 1/79; 1/80-1/94; eliminated 7/99; 7/2000 | | NRHS |
| 14 | ZCCX | ZEIGLER COAL COMPANY | | | PWRC |
| 15 | ZCCX | Zeigler Coal | | | RSRV |
| 16 | ZCCX | ZEIGLER COAL COMPANY | | | SCAC4 |
| 17 | ZCDV | ZANIN CD DVD INC | | | SCAC4 |
| 18 | ZCG | Zeljeznica Crne Gore | | CG | TRAFFIC |
| 19 | ZCG | Željeznice Crne Gore | | ME | VKM |
| 20 | ZCHA | Zakłady Chemiczne “Alwernia” S.A. | | PL | VKM |
| 21 | ZCHLU | LUVENA S.A. | | PL | VKM |
| 22 | ZCHN | ZAMUDIO CAMACHO, HOUSTON | | | SCAC4 |
| 23 | ZCHR | ZAKŁADY CHEMICZNE “RUDNIKI” S.A. | | PL | VKM |
| 24 | ZCHSA | Zakłady Chemiczne „Organika-Sarzyna” S.A. | | PL | VKM |
| 25 | ZCHSI | Zakłady Chemiczne “Siarkopol” Tarnobrzeg Sp. z o.o. | | PL | VKM |
| 26 | ZCHZ | Zakłady Chemiczne ZACHEM S.A. | | PL | VKM |
| 27 | ZCIN | ZAI CARGO INC | | | SCAC4 |
| 28 | ZCJA | ZUNIGA CARDENAS, JAVIER ALEJANDRO | | | SCAC4 |
| 29 | ZCKF | ZACKY FARMS | | | SCAC4 |
| 30 | ZCKT | ZUECK TRANSPORTATION COMPANY | | | SCAC4 |
| 31 | ZCLU | ZIM INTEGRATED SHIPPING SERVICES LTD | | IL | BIC |
| 32 | ZCLU | ZIM ISRAEL NAVIGATION CO LTD | | | SCAC4 |
| 33 | ZCSU | ZIM INTEGRATED SHIPPING SERVICES LTD | | IL | BIC |
| 34 | ZCSU | ZIM AMERICAN ISRAELI SHIPPING CO INC | | | PWRC |
| 35 | ZCSU | Zim American Israeli Shipping | | | RSRV |
| 36 | ZCSU | ZIM ISRAEL NAVIGATION CO LTD | | | SCAC4 |
| 37 | ZCSV | ZAP COURIER SERVICES | | | SCAC4 |
