| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onecote | city | Staffordshire | United Kingdom | 53.08 | -1.93 | 1003 | 6109 |
| Onibury | city | Shropshire | United Kingdom | 52.40 | -2.80 | 393 | 3381 |
| Onich | city | Highland | United Kingdom | 56.70 | -5.22 | 0 | 0 |
| Onllwyn | city | Neath Port Talbot | United Kingdom | 51.77 | -3.68 | 1082 | 25746 |
| Onneley | city | Staffordshire | United Kingdom | 52.98 | -2.37 | 830 | 18557 |