| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Cicester | city | Gloucestershire | United Kingdom | 51.73 | -1.98 | 830 | 5066 |
| Cicestria | city | West Sussex | United Kingdom | 50.83 | -0.78 | 91 | 53654 |
| Cidade de Londres | city | United Kingdom | 51.51 | -0.09 | 55 | 735279 | |
| Cil-y-coed | city | Sir Fynwy | United Kingdom | 51.59 | -2.75 | 13 | 19606 |
| Cilcain | city | Flintshire | United Kingdom | 53.17 | -3.23 | 830 | 13807 |
| Cilcennin | city | Ceredigion | United Kingdom | 52.22 | -4.17 | 830 | 2831 |
| Cilgerran | city | Sir Benfro | United Kingdom | 52.05 | -4.63 | 252 | 3892 |
| Cilgeti | city | Sir Benfro | United Kingdom | 51.73 | -4.71 | 36 | 4222 |
| Cilgwm | city | Sir Benfro | United Kingdom | 51.99 | -4.80 | 830 | 4572 |
| Ciliau-Aeron | city | Ceredigion | United Kingdom | 52.20 | -4.20 | 370 | 2831 |
| Cill Chaoil | city | Newry, Mourne and Down | United Kingdom | 54.06 | -6.00 | 36 | 3953 |
| Cill Chléithe | city | Newry, Mourne and Down | United Kingdom | 54.33 | -5.55 | 3 | 4838 |
| Cill Duinsí | city | Ards and North Down | United Kingdom | 54.47 | -5.67 | 39 | 6411 |
| Cill Eanaigh | city | Lisburn and Castlereagh | United Kingdom | 54.45 | -5.92 | 269 | 11969 |
| Cill Fhinn | city | Stirling | United Kingdom | 56.47 | -4.32 | 830 | 0 |
| Cill Fhinnean | city | North Ayrshire | United Kingdom | 55.65 | -4.72 | 26 | 11598 |
| Cill Ghobáin | city | Ards and North Down | United Kingdom | 54.48 | -5.53 | 32 | 6258 |
| Cill Locha | city | Newry, Mourne and Down | United Kingdom | 54.25 | -5.64 | 0 | 3881 |
| Cill Mheàrnag | city | East Ayrshire | United Kingdom | 55.63 | -4.53 | 206 | 3511 |
| Cill Mheàrnaig | city | East Ayrshire | United Kingdom | 55.63 | -4.53 | 206 | 3511 |
| Cill Mhór Mhorainn | city | Armagh, Banbridge and Craigavon | United Kingdom | 54.40 | -6.55 | 216 | 13632 |
| Cill Reachtais | city | Causeway Coast and Glens | United Kingdom | 55.05 | -6.42 | 351 | 5357 |
| Cill Ria | city | Causeway Coast and Glens | United Kingdom | 54.97 | -6.58 | 121 | 3460 |
| Cill Saidhe | city | North Lanarkshire | United Kingdom | 55.97 | -4.05 | 249 | 47767 |
| Cill-iubhar | city | Causeway Coast and Glens | United Kingdom | 55.08 | -6.67 | 154 | 9984 |
| Cille Bhraonaidh | city | North Ayrshire | United Kingdom | 55.75 | -4.70 | 203 | 17292 |
| Cille Bhrìghde an Ear | city | South Lanarkshire | United Kingdom | 55.77 | -4.17 | 830 | 32732 |
| Cille Bhrìghde an Iar | city | North Ayrshire | United Kingdom | 55.68 | -4.85 | 200 | 8343 |
| Cille Brighde | city | Highland | United Kingdom | 57.20 | -5.97 | 830 | 0 |
| Cille Chuimein | city | Highland | United Kingdom | 57.13 | -4.68 | 367 | 0 |
| Cille Chuithbeirt | city | Dumfries and Galloway | United Kingdom | 54.83 | -4.03 | 216 | 1336 |
| Cille Chòmhghain | city | Highland | United Kingdom | 56.70 | -6.10 | 190 | 0 |
| Cille Mhartain | city | Argyll and Bute | United Kingdom | 56.12 | -5.48 | 377 | 233 |
| Cille Mheàrnaig | city | East Ayrshire | United Kingdom | 55.63 | -4.53 | 206 | 3511 |
| Cille Mhoire | city | Highland | United Kingdom | 57.53 | -4.20 | 0 | 3242 |
| Cille Mhára | city | East Ayrshire | United Kingdom | 55.63 | -4.53 | 206 | 3511 |
| Cille Pheadair | city | Renfrewshire | United Kingdom | 55.87 | -4.55 | 216 | 46900 |
| Cille Phàdraig Ùr | city | East Dunbartonshire | United Kingdom | 55.92 | -4.35 | 213 | 115359 |
| Cille Phádraig | city | West Dunbartonshire | United Kingdom | 55.92 | -4.45 | 200 | 44598 |
| Cille a' Bhacstair | city | Highland | United Kingdom | 57.65 | -6.40 | 68 | 0 |
| Cilmalieu | city | Highland | United Kingdom | 56.63 | -5.43 | 0 | 0 |
| Cilrhedyn | city | Sir Benfro | United Kingdom | 51.98 | -4.51 | 830 | 1563 |
| Cilybebyll | city | Neath Port Talbot | United Kingdom | 51.72 | -3.82 | 830 | 26055 |
| Cilycwm | city | Carmarthenshire | United Kingdom | 52.03 | -3.83 | 374 | 0 |
| Cilâ Uchaf | city | Swansea | United Kingdom | 51.61 | -4.04 | 249 | 56513 |
| Cinderford | city | Gloucestershire | United Kingdom | 51.82 | -2.48 | 410 | 10872 |
| Cinn Chárdainn | city | Fife | United Kingdom | 56.07 | -3.72 | 13 | 27390 |
| Cionn Aird | city | Mid Ulster | United Kingdom | 54.35 | -6.83 | 246 | 3303 |
| Cippanhamm | city | Wiltshire | United Kingdom | 51.46 | -2.12 | 209 | 27293 |
| Cirenceaster | city | Gloucestershire | United Kingdom | 51.73 | -1.98 | 830 | 5066 |
| Cirencester | city | Gloucestershire | United Kingdom | 51.73 | -1.98 | 830 | 5066 |
| Ciricestria | city | Gloucestershire | United Kingdom | 51.73 | -1.98 | 830 | 5066 |
| Ciricewæl | city | Orkney Islands | United Kingdom | 58.97 | -2.95 | 118 | 4271 |
| Città di Londra | city | United Kingdom | 51.51 | -0.09 | 55 | 735279 | |
| City de Londres | city | City of London | United Kingdom | 51.51 | -0.09 | 55 | 735279 |
| City of London | city | City of London | United Kingdom | 51.51 | -0.09 | 55 | 735279 |
| City of Newport | city | Newport | United Kingdom | 51.58 | -2.98 | 3 | 54692 |
| City of Westminster | city | Westminster | United Kingdom | 51.50 | -0.12 | 49 | 728805 |
| City of Worcester | city | Worcestershire | United Kingdom | 52.20 | -2.20 | 236 | 128960 |
| Cité de Londres | city | City of London | United Kingdom | 51.51 | -0.09 | 55 | 735279 |
| Civitas Londinium | city | United Kingdom | 51.51 | -0.09 | 55 | 735279 |