| Code | Name | Region |
|---|---|---|
| GBCXY | Cosby | LEC |
| GBYXL | Coseley | WLV |
| GBCSF | Cosford | WAR |
| GBCOS | Cosham | HAM |
| GBTCS | Cossall | NTT |
| GBCIG | Cossington | LEC |
| GBCNG | Coningsby | LIN |
| GBCIO | Conisbrough | DNC |
| GBCIS | Coniston | CMA |
| GBCQY | Connahs Quay | FLN |
| GBCOQ | Connah's Quay | FLN |
| GBCGR | Cononbridge | HLD |
| GBCNT | Consett | DUR |
| GBCZZ | Constantine | CON |
| GBCVW | Convoys Wharf | |
| GBCWA | Conwy (conway) | CWY |
| GBCKH | Cookham | WNM |
| GBCKL | Cookley | SFK |
| GBZAR | Cookley | SFK |
| GBCOO | Cookstown | CKT |
| GBHXM | Coolham | WSX |
| GBCBB | Coombe Bissett | WIL |
| GBCMI | Coombe Hill | GLS |
| GBCPV | Copgrove | NYK |
| GBOPS | Copplestone | DEV |
| GBOPP | Coppull | LAN |
| GBCLN | Colne | LAN |
| GBC8N | Colney | NFK |
| GBCOZ | Colney Heath | ESX |
| GBCSA | Colonsay | |
| GBXCO | Colsterworth | LIN |
| GBCTA | Coltishall | NFK |
| GBCWL | Colwall | HEF |
| GBCLW | Colwich | STS |
| GBCLK | Colwick | NTT |
| GBCYY | Colwyn Bay (bae Colwyn) | CWY |
| GBCLO | Colyton | DEV |
| GBOMB | Combe | OXF |
| GBCBM | Combe Martin | DEV |
| GBXCM | Comber | ARD |
| GBCMN | Commondale | NYK |
| GBCPO | Compton | WBK |
| GBCIE | Comrie | PKN |
| GBCDO | Condicote | GLS |
| GBCON | Congleton | CHE |
| GBCGY | Congresbury | NSM |
| GBCB2 | Colburn | NYK |
| GBCOL | Colchester | ESS |
| GBONT | Cold Norton | ESS |
| GBCCO | Colden Common | HAM |