| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Onano | city | Italy | 42.68 | 11.82 | 1640 | 5209 | |
| Onara | city | Italy | 45.62 | 11.82 | 101 | 37888 | |
| Oneglia | city | Italy | 43.88 | 8.03 | 0 | 36301 | |
| Onelli | city | Italy | 42.68 | 13.02 | 3100 | 1562 | |
| Oneta | city | Italy | 45.87 | 9.82 | 2260 | 9035 | |
| Onfiano | city | Italy | 44.48 | 10.55 | 1279 | 4663 | |
| Onna | city | Italy | 42.32 | 13.47 | 1938 | 19621 | |
| Onno | city | Italy | 45.92 | 9.28 | 613 | 10615 | |
| Onzato | city | Italy | 45.48 | 10.17 | 301 | 79267 |