| Code | Name | Region |
|---|---|---|
| GBCWT | Crowthorne | BRC |
| GBCGX | Croxley Green | HRT |
| GBCXN | Croxton | CAM |
| GBZAV | Croy | HLD |
| GBCOX | Croy | NLK |
| GBCRO | Croydon | CRY |
| GBCRI | Crick | NTH |
| GBCKE | Cricklade | WIL |
| GBCLG | Cricklewood/london | BEN |
| GBCFE | Crieff | PKN |
| GBCIP | Crimplesham | NFK |
| GBCNC | Crinan | AGB |
| GBCRL | Croft | LEC |
| GBCGG | Croggan | AGB |
| GBCRN | Cromarty | HLD |
| GBCMP | Crombie | FIF |
| GBCRR | Cromer | NFK |
| GBCXM | Cromford | DBY |
| GBRNO | Cronton | HAL |
| GBCOK | Crook | CMA |
| GBZAU | Crook | DUR |
| GBCRP | Cropthorne | WOR |
| GBCR5 | Cropton | NYK |
| GBCRB | Crosby | SFT |
| GBRHD | Cross Hands | CMN |
| GBOHI | Cross Hills | NYK |
| GBCXX | Cranford | DEV |
| GBCG9 | Cranford | HNS |
| GBCGH | Cranleigh | SRY |
| GBZAS | Cranmore | SOM |
| GBCRX | Craster | |
| GBVMA | Craven Arms | SHR |
| GBRWY | Crawley | OXF |
| GBCWY | Crawley | WSX |
| GBXCR | Crawley Down | WSX |
| GBCRY | Crayford | KEN |
| GBCYL | Crays Hill | ESS |
| GBCDI | Crediton | DEV |
| GBCKS | Creeksea | |
| GBCSS | Cressing | ESS |
| GBSSW | Cresswell | STS |
| GBCRE | Crewe | CHE |
| GBCRK | Crewkerne | SOM |
| GBCIA | Crianlarich | STG |
| GBCCC | Criccieth | GWN |
| GBZAT | Crick | MON |
| GBCOW | Cowes | IOW |
| GBCDU | Cowfold | WSX |
| GBCWI | Cowie | STG |
| GBCY2 | Cowley | LND |