- Congresbury - 1 company
- Coniston - 3 companies
- Consett - 15 companies
- Conwy - 8 companies
- Conwy County - 1 company
- Cookstown - 25 companies
- Copthorne - 4 companies
- Corbridge - 1 company
- Corby - 90 companies
- Cork - 1 company
- Cornwall - 29 companies
- Corringham - 1 company
- Corsham - 20 companies
- Corwen - 6 companies
- Cosby - 1 company
- Coseley - 1 company
- Cotgrave - 1 company
- Cottenham - 2 companies
- Cottingham - 6 companies
- Coulsdon - 17 companies
- Country Durham - 1 company
- County Antrim - 3 companies
- County Armagh - 3 companies
- County Borough of Conwy - 1 company
- County Cork - 1 company
- County Down - 5 companies
- County Durham - 17 companies
- County Meath - 1 company
- County Tyrone - 1 company
- Covent Garden - 9 companies
- Coventry - 386 companies
- Cowbridge - 12 companies
- Cowdenbeath - 4 companies
- Cowes - 12 companies
- Cowfield - 1 company
- Cowley - 2 companies
- Cradley Heath - 57 companies
- Craigavon - 63 companies
- Cramlington - 45 companies
- Cranbrook - 19 companies
- CRANFIELD - 2 companies
- Crank - 1 company
- Cranleigh - 22 companies
- Craven Arms - 14 companies
- Crawfordsville - 1 company
Towns 226 to 270 | Page 6 of 7
