Caernarvon Boroughs Linked borough within Caernarvonshire
 
Caernarvonshire Welsh County
 
Caithness Scottish County
 
Callington Borough within Cornwall
 
Calne Borough within Wiltshire
 
Cambridge Borough within Cambridgeshire
 
Cambridge University University within Cambridgeshire
 
Cambridgeshire County
 
Camelford Borough within Cornwall
 
Canterbury Borough within Kent
 
Cardiff Boroughs Linked borough within Glamorgan
 
Cardigan Boroughs Linked borough within Cardiganshire
 
Cardiganshire Welsh County
 
Carlisle Borough within Cumberland
 
Carmarthen Borough within Carmarthenshire
 
Carmarthenshire Welsh County
 
Castle Rising Borough within Norfolk
 
Cheshire County
 
Chester Borough within Cheshire
 
Chichester Borough within Sussex
 
Chippenham Borough within Wiltshire
 
Chipping Wycombe Borough within Buckinghamshire
 
Christchurch Borough within Dorset
 
Cirencester Borough within Gloucestershire
 
Clackmannanshire Scottish County
 
Clitheroe Borough within Lancashire
 
Cockermouth Borough within Cumberland
 
Colchester Borough within Essex
 
Corfe Castle Borough within Dorset
 
Cornwall County
 
Coventry Borough within Warwickshire
 
Cricklade Borough within Wiltshire
 
Cromartyshire Scottish County