- C orby - 1 company
- C Salzbaach - 1 company
- Cabus - 1 company
- Caerdydd - 1 company
- Caernarfon - 2 companies
- Caerphilly - 38 companies
- Caersws - 3 companies
- Caistor - 1 company
- Caithness - 2 companies
- Calcot - 2 companies
- Caldercruix - 1 company
- Caldicot - 7 companies
- Callander - 1 company
- Callington - 6 companies
- Calne - 13 companies
- Calverley - 2 companies
- Calverton - 3 companies
- Cam - 1 company
- Camarthenshire - 1 company
- Camberley - 77 companies
- Camberwell - 1 company
- Camborne - 2 companies
- Camborne Cornwall - 1 company
- Cambridge - 218 companies
- Cambridgeshire - 87 companies
- Cambridgshire - 1 company
- Cambrigeshire - 2 companies
- Cambs - 33 companies
- Camden - 3 companies
- Camelford - 2 companies
- Canada - 5 companies
- Canary Wharf - 1 company
- Canning Town - 1 company
- Cannock - 61 companies
- Cannon Drive - 1 company
- Canock - 1 company
- Canterbury - 33 companies
- Canton - 1 company
- Canvey Island - 15 companies
- Capel - 1 company
- Cardiff - 183 companies
- Cardiff Bay - 3 companies
- Cardigan - 2 companies
- Cardington - 1 company
- Carhalton - 1 company
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