| Code | Name | Region |
|---|---|---|
| GBCUP | Cupar | FIF |
| GBCU8 | Curbar | DBY |
| GBCUG | Curbridge | HAM |
| GBCDR | Curdridge | HAM |
| GBUWH | Curdworth | WAR |
| GBCUR | Curlew | |
| GBXCU | Curridge | WBK |
| GBCUS | Cushendall | MYL |
| GBCUE | Cushendun | MYL |
| GBCUT | Cutnall Green | WOR |
| GBCWF | Cwm Ffrwd-oer | |
| GBCWM | Cwmbran | TOF |
| GBWFH | Cwmfelinfach | |
| GBCYW | Cynwyd | DEN |
| GBCY6 | Cynwyl Elfed | CMN |
| GBDAF | Dafen | CMN |
| GBCGI | Crudgington | SHR |
| GBCHY | Crughywel (crickhowell) | POW |
| GB8TN | Crumlin | ANT |
| GBCML | Crumlin | CAY |
| GBCQM | Crumpsall | MAN |
| GBCUA | Cuan Ferry, Seil | AGB |
| GBCFL | Cuckfield | WSX |
| GBCUD | Cuddington | BKM |
| GBTUF | Cuffley | HRT |
| GBCUH | Culham | OXF |
| GBCKN | Culkein | HLD |
| GBCLM | Culkein/drumbeg | HLD |
| GBCUN | Cullen | MRY |
| GBCGW | Cullingworth | BRD |
| GBCUV | Cullivoe, Yell | ZET |
| GBULO | Culloden | HLD |
| GBCUL | Cullompton | |
| GBCYB | Cullybackey | ANT |
| GBZAX | Culross | FIF |
| GBCLD | Cumbernauld | NLK |
| GBOHU | Cross Houses | SHR |
| GBCIC | Cross In Hand | ESX |
| GBCSK | Cross Keys | CAY |
| GBSGR | Crossgar | DOW |
| GBCKY | Crosskeys | CAY |
| GBCKK | Crosskirk | HLD |
| GBXCS | Crossmaglen | NYM |
| GBCCV | Crossnacreevy | CSR |
| GBCRM | Croughton | NTH |
| GBOWN | Crowan | CON |
| GBCWB | Crowborough | ESX |
| GBXCN | Crowland | LIN |
| GBXCE | Crowle | NLN |
| GBJHW | Crown Dry-dock | KHL |