Twin Towns in the UK
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| UK town | UK region | Overseas town/region | Overseas country |
| Caddington | Bedfordshire | Oststeinbeck | Germany |
| Caernarfon | Caernarfonshire & Meirioneth | Landerneau | France |
| Caerphilly | Caerphilly | Lannion | France |
| Caerphilly | Caerphilly | Ludwigsburg | Germany |
| Caerphilly | Caerphilly | Pisek | Czech Republic |
| Caerphilly | Caerphilly | Pisek | Czech Republic |
| Caistor | Lincolnshire | Savigne-L'Eveque | France |
| Caithness | Highland | Glace Bay | Canada |
| Calderdale | West Yorkshire | Co Mayo | Ireland |
| Calderdale | West Yorkshire | Musoma | Tanzania |
| Calderdale | West Yorkshire | Strakonice | Czech Republic |
| Caldicot | Monmouthshire | Waghausel | Germany |
| Callington | Cornwall | Guipavas | France |
| Calne | Wiltshire | Caln | USA |
| Calne | Wiltshire | Charlieu | France |
| Calne | Wiltshire | Eningen Unter Achalm | Germany |
| Calstock | Cornwall | St Thuriau | France |
| Calverton | Nottinghamshire | Longue | France |
| Cambourne | Cornwall | Ste-Anne-D'Auray | France |
| Cambridge | Cambridgeshire | Heidelberg | Germany |
| Cambridge | Cambridgeshire | Szeged | Hungary |
| Cambridgeshire County | Cambridgeshire | Kreis Viersen | Germany |
| Camden | London | Frederiksberg | Denmark |
| Camden | London | Luxembourg City | Luxembourg |
| Camden | London | Mochudi | Botswana |
| Cannock | Staffordshire | Datteln | Germany |
| Canterbury | Kent | Vladimir | Russia |
| Canterbury | Kent | Bloomington | USA |
| Canterbury | Kent | Reims | France |
| Cardiff | Cardiff | Hordaland | Norway |
| Cardiff | Cardiff | Lugansk | Ukraine |
| Cardiff | Cardiff | Nantes | France |
| Cardiff | Cardiff | Stuttgart | Germany |
| Cardiff | Cardiff | Xiamen | China |
| Cardigan | Cardiganshire | Brioude | France |
| Carlisle | Cumbria | Flensburg | Germany |
| Carlisle | Cumbria | Slupsk | Poland |
| Carmarthen | Carmarthenshire | Lesneven | France |
| Carnoustie | Angus | Maule | France |
| Carrickfergus | Co Antrim | Portsmouth | USA |
| Castle Cary & Ansford | Somerset | Remalard | France |
| Castle Donington | Leicestershire | Gasny | France |
| Castle Point | Essex | Co Roscommon | Ireland |
| Castle Point | Essex | Koeln District 3 | Germany |
| Castle Point | Essex | Romainville | France |
| Castlereagh | Co Down | Soulac-sur-Mer | France |
| Castlereagh | Co Down | Kent | USA |
| Cawsand | Cornwall | Porspoder | France |
| Cefn Cribbwr | Bridgend | Ecquetot | France |
| Chagford | Devon | Bretteville-Sur-Laize | France |
| Chalfont-St-Giles | Buckinghamshire | Graft De Rijp | Netherlands |
| Chapel St Leonards | Lincolnshire | Cerans Foulletourt | France |
| Chapel-En-Le-Frith | Derbyshire | Friedburg | Germany |
| Chard/Helmstedt | Somerset | Morangis | France |
| Chard/Morangis | Somerset | Helmstedt | Germany |
| Charmouth | Dorset | Asnelles | France |
| Chatham | Kent | Valenciennes | France |
| Chawleigh | Devon | St-Martin-De-Mailloc | France |
| Cheddar | Somerset | Vernouillet | France |
| Cheddar/Vernouillet | Somerset | Felsberg | Germany |
| Cheddleton | Staffordshire | Mitterteich | Germany |
| Chelmsford | Essex | Annonay | France |
| Chelmsford | Essex | Backnang | Germany |
| Cheltenham | Gloucestershire | Annecy | France |
| Cheltenham | Gloucestershire | Cheltenham | USA |
| Cheltenham | Gloucestershire | Gottingen | Germany |
| Cheltenham | Gloucestershire | Sochi | Russia |
| Cheltenham | Gloucestershire | Weihai | China |
| Chepstow | Monmouthshire | Cormeilles | France |
| Cheriton Fitzpaine | Devon | Bonnebosq | France |
| Cherry Willingham | Lincolnshire | Le Grand-Luce | France |
| Cheshire | Cheshire | Archena | Spain |
| Cheshire | Cheshire | Friedrichsdorf/Taunus | Germany |
| Cheshire | Cheshire | Houilles | France |
| Cheshunt | Hertfordshire | Stains | France |
| Chester | Cheshire | Senigallia | Italy |
| Chester | Cheshire | Loerrach | Germany |
| Chester | Cheshire | Lakewood | USA |
| Chester | Cheshire | Sens | France |
| Chester-Le-Street | Durham | Kamp-Lintfort | Germany |
| Chesterfield | Derbyshire | Darmstadt | Germany |
| Chesterfield | Derbyshire | Troyes | France |
| Chesterfield | Derbyshire | Tsumeb | Namibia |
| Chesterfield | Derbyshire | Yangquan | China |
| Chichester | West Sussex | Chartres | France |
| Chichester | West Sussex | Ravenna | Italy |
| Chiddingly | East Sussex | Lachelle | France |
| Chilcompton | Somerset | Montsurs | France |
| Chinley | Buxworth & Brownside | Derbyshire | USA |
| Chippenham | Wiltshire | Friedberg/Bay. | Germany |
| Chippenham | Wiltshire | La Fleche | France |
| Chipping Camden | Gloucestershire | Pont-D'Ouilly | France |
| Chipping Norton | Oxfordshire | Magny-En-Vexin | France |
| Chittlehampton | Devon | Baron-Sur-Odon | France |
| Chorley | Lancashire | Szekesfehevar | Hungary |
| Chorleywood | Hertfordshire | Dardilly | France |
| Christchurch | Dorset | Aalen | Germany |
| Christchurch | Dorset | Christchurch | New Zealand |
| Christchurch | Dorset | St-Lo | France |
| Christchurch | Dorset | Tatabanya | Hungary |
| Chudleigh | Devon | Troarn | France |
| Chulmleigh | Devon | Fontenay-Le-Marmion | France |
| Churchstanton | Somerset | Le Mesnil Vigot | France |
| Cirencester | Gloucestershire | Saint Genis-Laval | France |
| Cirencester | Gloucestershire | Itzehoe | Germany |
| Clanfield | Hampshire | Val D'Oison | France |
| Clevedon | North Somerset | Epernay | France |
| Clevedon | North Somerset | Ettingen | Germany |
| Clevedon | North Somerset | Middelkerke | Belgium |
| Cleveland County | Cleveland | Cleveland | USA |
| Cleveland County | Cleveland | Szczecin Region | Poland |
| Clitheroe | Lancashire | Rivesaltes | France |
| Clovelly | Devon | Cesny-Bois-Halbout | France |
| Clydesdale | South Lanarkshire | Hemmingen/Hann. | Germany |
| Clydesdale | South Lanarkshire | Yvetot | France |
| Clyst St Mary | Devon | Merville-Franceville-Plage | France |
| Coalville | Leicestershire | Romans-Sur-Isere | France |
| Cockermouth | Cumbria | Marvejols | France |
| Codsall And Bilbrook | Staffordshire | St-Pryve-St-Mesmin | France |
| Colchester | Essex | Avignon | France |
| Colchester | Essex | Colchester | USA |
| Colchester | Essex | Imola | Italy |
| Colchester | Essex | Wetzlar | Germany |
| Colden Common | Hampshire | St-Vigor-Le-Grand | France |
| Coldstream | Scottish Borders | Bennecourt | France |
| Coleraine | Co Londonderry | La Roche-Sur-Yon | France |
| Coleshill | Warwickshire | Chassieu | France |
| Collingbourne Ducis | Wiltshire | Le Merlerault | France |
| Collingham | Nottinghamshire | Villeneuve-Sur-Yonne | France |
| Colne Valley | West Yorkshire | Overath | Germany |
| Colney Heath | Hertfordshire | Boissy-Sous-St-Yon | France |
| Colwich & The Haywoods | Staffordshire | Rimbach/Odenwald | Germany |
| Colwyn Bay | Aberconwy And Colwyn | Roissy-En Brie | France |
| Combe Martin | Devon | Cormelles-Le-Royal | France |
| Combeinteignhead | Devon | Osmanville | France |
| Comberton | Cambridgeshire | Le Vaudreuil | France |
| Comrie | Perthshire And Kinross | Carleton Place | Canada |
| Congleton | Cheshire | Oosterhout | Netherlands |
| Congleton | Cheshire | Trappes | France |
| Coniston | Cumbria | Illiers-Combray | France |
| Constantine | Cornwall | Pont-Croix | France |
| Cookham | Berkshire | St Benoit | France |
| Cookstown | Co Tyrone | Plerin | France |
| Copplestone | Devon | St-Cyr-Du-Ronceray | France |
| Corby | Northamptonshire | Chatellerault | France |
| Corby | Northamptonshire | Miskolc | Hungary |
| Corby | Northamptonshire | Portsmouth | USA |
| Corby | Northamptonshire | Shijiazhuang | China |
| Corby | Northamptonshire | Velbert | Germany |
| Corfe Castle | Dorset | Pont Hebert | France |
| Corsham | Wiltshire | Jargeau | France |
| Countesthorpe | Leicestershire | Mennecy | France |
| County Durham | Durham | Jaszbereny | Hungary |
| County Durham | Durham | Alcala De Guadaira | Spain |
| County Durham | Durham | Banska Bystrica | Slovakia |
| County Durham | Durham | Durham County | USA |
| County Durham | Durham | Kostroma | Russia |
| County Durham | Durham | Kreis Wesel | Germany |
| County Durham | Durham | Nakskov | Denmark |
| County Durham | Durham | Somme | France |
| County Durham | Durham | Tubingen | Germany |
| Coventry | West Midlands | Arnhem | Netherlands |
| Coventry | West Midlands | Belgrade | Serbia |
| Coventry | West Midlands | Bologna | Italy |
| Coventry | West Midlands | Caen | France |
| Coventry | West Midlands | Cork | Ireland |
| Coventry | West Midlands | Cornwall | Canada |
| Coventry | West Midlands | Coventry | USA |
| Coventry | West Midlands | Coventry | USA |
| Coventry | West Midlands | Coventry | USA |
| Coventry | West Midlands | Dresden | Germany |
| Coventry | West Midlands | Dunaujvaros | Hungary |
| Coventry | West Midlands | Galati | Romania |
| Coventry | West Midlands | Granby | Canada |
| Coventry | West Midlands | Graz | Austria |
| Coventry | West Midlands | Jinan | China |
| Coventry | West Midlands | Kecskemet | Hungary |
| Coventry | West Midlands | Kiel | Germany |
| Coventry | West Midlands | Kingston | Jamaica |
| Coventry | West Midlands | Lidice | Czech Republic |
| Coventry | West Midlands | Ostrava | Czech Republic |
| Coventry | West Midlands | Parkes | Australia |
| Coventry | West Midlands | Sarajevo | Bosnia Herzegovina |
| Coventry | West Midlands | St-Etienne | France |
| Coventry | West Midlands | Volgograd | Russia |
| Coventry | West Midlands | Warsaw | Poland |
| Cowbridge | Vale Of Glamorgan | Clisson | France |
| Cowdenbeath | Fife | Barsbuttel | Germany |
| Cowes | Isle Of Wight | Deauville | France |
| Coxheath | Kent | La Seguiniere | France |
| Craigavon | Co Armagh | La Grange | USA |
| Cranleigh | Surrey | Vallendar | Germany |
| Crawley | West Sussex | Dorsten | Germany |
| Crawley | West Sussex | Lilongwe | Malawi |
| Crediton | Devon | Avranches | France |
| Creech St Michael | Somerset | Villages De Vallee D'Auge | France |
| Crewe | Cheshire | Bischofsheim/Russelsheim | Germany |
| Crewe | Cheshire | Macon | France |
| Crewkerne | Somerset | Igny | France |
| Crickhowell | Powys | Scaer | France |
| Cricklade | Wiltshire | Suce-Sur-Erdre | France |
| Cromer | Norfolk | Crest | France |
| Cromer | Norfolk | Nidda | Germany |
| Crookham | Hampshire | Levignen | France |
| Croston | Lancashire | Azay-Le-Rideau | France |
| Crowborough | East Sussex | Montargis | France |
| Crowland | Lincolnshire | Parigne-L'Eveque | France |
| Croydon | London | Arnhem | Netherlands |
| Crymych | Pembrokeshire | Plomelin | France |
| Cuckfield | West Sussex | Aumale | France |
| Culcheth | Cheshire | St-Leu-La-Foret | France |
| Cullompton | Devon | Ploudalmezeau | France |
| Cumbernauld | North Lanarkshire | Bron | France |
| Cumbria County | Cumbria | Rheinisch-Bergischer Kreis | Germany |
| Cumnock & Doon Valley | East Ayrshire | Joue-Les-Tours | France |
| Cunningham | Co Fermanagh | Husa | Sweden |
| Curry Rivel | Somerset | Chevilly | France |
| Cwmamman | Carmarthenshire | Pouldergat | France |
| Cwmbran | Torfaen | Bruchsal | Germany |