| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Cas Chaolais | city | City of Edinburgh | United Kingdom | 55.98 | -3.40 | 42 | 81342 |
| Cas Chaolas | city | City of Edinburgh | United Kingdom | 55.98 | -3.40 | 42 | 81342 |
| Cas-gwent | city | Sir Fynwy | United Kingdom | 51.64 | -2.68 | 9 | 26867 |
| Cas-mael | city | Sir Benfro | United Kingdom | 51.93 | -4.90 | 830 | 4619 |
| Casblaidd | city | Sir Benfro | United Kingdom | 51.90 | -4.97 | 246 | 4950 |
| Cascob | city | Powys | United Kingdom | 52.28 | -3.12 | 944 | 1490 |
| Cashel Dhu | city | Highland | United Kingdom | 58.40 | -4.63 | 830 | 0 |
| Cashlie | city | Perth and Kinross | United Kingdom | 56.53 | -4.45 | 1899 | 0 |
| Caskieben | city | Aberdeenshire | United Kingdom | 57.20 | -2.27 | 830 | 39914 |
| Casllwchwr | city | Swansea | United Kingdom | 51.66 | -4.06 | 121 | 52578 |
| Casnewydd | city | Newport | United Kingdom | 51.58 | -2.98 | 3 | 54692 |
| Casnewydd Bach | city | Sir Benfro | United Kingdom | 51.92 | -4.93 | 830 | 4621 |
| Cassington | city | Oxfordshire | United Kingdom | 51.78 | -1.35 | 249 | 26448 |
| Castell Coety | city | Bridgend | United Kingdom | 51.52 | -3.55 | 249 | 39054 |
| Castell Combe | city | Wiltshire | United Kingdom | 51.49 | -2.23 | 328 | 7688 |
| Castell Nedd | city | Neath Port Talbot | United Kingdom | 51.66 | -3.80 | 351 | 24526 |
| Castell Newydd Emlyn | city | Carmarthenshire | United Kingdom | 52.03 | -4.47 | 364 | 1182 |
| Castell-nedd | city | Neath Port Talbot | United Kingdom | 51.66 | -3.80 | 351 | 24526 |
| Castellnewydd Emlyn | city | Carmarthenshire | United Kingdom | 52.03 | -4.47 | 364 | 1182 |
| Casterton | city | Cumbria | United Kingdom | 54.20 | -2.57 | 830 | 5406 |
| Casterton | city | Rutland | United Kingdom | 52.65 | -0.52 | 127 | 13809 |
| Castle Acre | city | Norfolk | United Kingdom | 52.70 | 0.68 | 180 | 5775 |
| Castle Ashby | city | Northamptonshire | United Kingdom | 52.22 | -0.73 | 249 | 16609 |
| Castle Bromwich | city | Birmingham | United Kingdom | 52.50 | -1.78 | 282 | 227282 |
| Castle Bytham | city | Lincolnshire | United Kingdom | 52.73 | -0.53 | 236 | 5701 |
| Castle Caereinion | city | Powys | United Kingdom | 52.63 | -3.23 | 830 | 1490 |
| Castle Camp | city | Cambridgeshire | United Kingdom | 52.05 | 0.37 | 249 | 4118 |
| Castle Camps | city | Cambridgeshire | United Kingdom | 52.05 | 0.37 | 249 | 4118 |
| Castle Carrock | city | Cumbria | United Kingdom | 54.88 | -2.72 | 830 | 4601 |
| Castle Cary | city | Somerset | United Kingdom | 51.09 | -2.51 | 242 | 10374 |
| Castle Combe | city | Wiltshire | United Kingdom | 51.49 | -2.23 | 328 | 7688 |
| Castle Donington | city | Leicestershire | United Kingdom | 52.83 | -1.33 | 259 | 31109 |
| Castle Donnington | city | Leicestershire | United Kingdom | 52.83 | -1.33 | 259 | 31109 |
| Castle Douglas | city | Dumfries and Galloway | United Kingdom | 54.93 | -3.95 | 154 | 1341 |
| Castle Eaton | city | Swindon | United Kingdom | 51.65 | -1.78 | 249 | 27812 |
| Castle Eden | city | Durham | United Kingdom | 54.73 | -1.32 | 246 | 49207 |
| Castle Frome | city | Herefordshire | United Kingdom | 52.10 | -2.48 | 331 | 4470 |
| Castle Hedingham | city | Essex | United Kingdom | 51.98 | 0.60 | 232 | 12499 |
| Castle Kennedy | city | Dumfries and Galloway | United Kingdom | 54.90 | -4.97 | 75 | 1238 |
| Castle Rising | city | Norfolk | United Kingdom | 52.80 | 0.48 | 45 | 14130 |
| Castlebay | city | Eilean Siar | United Kingdom | 56.95 | -7.47 | 0 | 332 |
| Castlecary | city | Falkirk | United Kingdom | 55.98 | -3.95 | 236 | 42047 |
| Castlecaulfield | city | Mid Ulster | United Kingdom | 54.50 | -6.83 | 259 | 4619 |
| Castledawson | city | Mid Ulster | United Kingdom | 54.78 | -6.57 | 203 | 5215 |
| Castlederg | city | Derry and Strabane | United Kingdom | 54.71 | -7.59 | 193 | 3158 |
| Castleford | city | Wakefield | United Kingdom | 53.72 | -1.35 | 121 | 82558 |
| Castlemartin | city | Sir Benfro | United Kingdom | 51.65 | -5.02 | 3 | 3306 |
| Castlemorris | city | Sir Benfro | United Kingdom | 51.94 | -5.05 | 239 | 4463 |
| Castlemorton | city | Worcestershire | United Kingdom | 52.03 | -2.30 | 226 | 2092 |
| Castlereagh | city | Lisburn and Castlereagh | United Kingdom | 54.57 | -5.87 | 390 | 107362 |
| Castlerock | city | Causeway Coast and Glens | United Kingdom | 55.15 | -6.78 | 127 | 6492 |
| Castleside | city | Durham | United Kingdom | 54.83 | -1.87 | 830 | 20911 |
| Castlethorpe | city | Milton Keynes | United Kingdom | 52.08 | -0.83 | 239 | 54849 |
| Castleton | city | Argyll and Bute | United Kingdom | 56.00 | -5.40 | 0 | 11067 |
| Castleton | city | The Scottish Borders | United Kingdom | 55.20 | -2.77 | 830 | 1676 |
| Castleton | city | North Yorkshire | United Kingdom | 54.45 | -0.93 | 830 | 7725 |
| Castleton | city | Rochdale | United Kingdom | 53.58 | -2.18 | 830 | 116257 |
| Castleton | city | Derbyshire | United Kingdom | 53.33 | -1.78 | 1043 | 7186 |
| Castleton | city | Newport | United Kingdom | 51.54 | -3.08 | 137 | 77399 |
| Castletown | city | Highland | United Kingdom | 58.58 | -3.38 | 95 | 0 |
| Castletown | city | Dorset | United Kingdom | 50.57 | -2.45 | 183 | 34338 |
| Castlewellan | city | Newry, Mourne and Down | United Kingdom | 54.27 | -5.93 | 104 | 6051 |
| Castlewigg | city | Dumfries and Galloway | United Kingdom | 54.75 | -4.43 | 180 | 1341 |
| Caston | city | Norfolk | United Kingdom | 52.55 | 0.90 | 173 | 6383 |
| Castor | city | Peterborough | United Kingdom | 52.57 | -0.33 | 101 | 40463 |
| Castra Deva Victrix | city | Cheshire West and Chester | United Kingdom | 53.20 | -2.92 | 39 | 34854 |