Regno unito
Tutte le voci di Regno unito:
- Caerfyrddin
- Caernarfon
- Caerphilly
- Caerphilly (autorità unitaria)
- Caerwent
- Caithness
- Caledònia
- Camborne-Redruth
- Cambrian Mountains
- Cambridge (Gran Bretagna)
- Cambridgeshire
- Camden (Gran Bretagna)
- Camulodunum
- Canale, ìsole del-
- Cannock
- Canterbury (Gran Bretagna)
- Cardiff
- Cardiff (autorità unitaria)
- Cardigan
- Carlisle (Gran Bretagna)
- Carlton
- Carmarthen
- Carmarthen, bàia di-
- Carmarthenshire
- Carrickfergus
- Cassitèridi
- Castle Ashby
- Castle Hedingham
- Castle Howard
- Castleford
- Castlereagh
- Caterham and Warlingham
- Central (Gran Bretagna)
- Ceredigion
- Chadderton
- Chagos
- Channel Islands
- Chatham (Gran Bretagna)
- Cheadle and Gatley
- Chelmsford
- Chelsea (Gran Bretagna)
- Cheltenham
- Chertsey
- Cheshire
- Cheshunt
- Chester (Gran Bretagna)
- Chester-le-Street
- Chesterfield
- Chichester
- Chigwell
- Chorley
- Christchurch (Gran Bretagna)
- City of London
- Clackmannanshire
- Clacton-on-Sea
- Clarendon Park
- Cleethorpes
- Cleveland (Gran Bretagna)
- Clwyd
- Clydebank
- Coatbridge
- Colchester
- Coleraine
- Consett
- Conway
- Conwy
- Cookstown
- Corby
- Cornovàglia e ìsole Scilly
- Cornwall and Isles of Scilly
- Covent Garden
- Coventry
- Cowes
- Craigavon
- Crawley
- Crewe
- Crosby
- Croydon
- Cumberland (ex contea)
- Cumbernauld
- Cumbria
- Cumbrian Mountains
- Cupar
- Cwmbran
- Cymru
- Càmbria