- Cabus - 1 company
- Cadnam - 2 companies
- Caernarfon - 8 companies
- Caerphilly - 59 companies
- Caersws - 4 companies
- Caistor - 1 company
- Caithness - 2 companies
- Calcot - 2 companies
- Caldercruix - 1 company
- Caldicot - 14 companies
- Caledon - 1 company
- California - 1 company
- Callander - 2 companies
- Callington - 10 companies
- Calne - 21 companies
- Calverley - 1 company
- Calverton - 3 companies
- Camarthenshire - 1 company
- Camberley - 99 companies
- Camberwell - 1 company
- Camborne - 3 companies
- Cambridge - 305 companies
- Cambridge, United Kingdom - 2 companies
- Cambridgeshire - 55 companies
- Cambridgshire - 1 company
- Cambrigeshire - 1 company
- Cambs - 20 companies
- Camden - 2 companies
- Camelford - 3 companies
- Campbeltown - 3 companies
- Canada - 4 companies
- Canary Wharf - 2 companies
- Canewdon - ROCHFORD - 1 company
- Cannock - 117 companies
- Cannon Drive - 1 company
- Canock - 1 company
- Canterbury - 57 companies
- Canvey Island - 21 companies
- Cardiff - 251 companies
- Cardiff Bay - 1 company
- Cardigan - 8 companies
- Cardington - 1 company
- Carlisle - 77 companies
- Carlow - 1 company
- Carlton - 1 company
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