| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ogliastro | city | Campania | Italy | 40.35 | 15.05 | 1243 | 23033 |
| Ogliastro Cilento | city | Campania | Italy | 40.35 | 15.05 | 1243 | 23033 |
| Olevano sul Tusciano | city | Campania | Italy | 40.67 | 15.02 | 830 | 27417 |
| Oliveto Citra | city | Campania | Italy | 40.68 | 15.23 | 830 | 9642 |
| Omignano | city | Campania | Italy | 40.25 | 15.08 | 928 | 8484 |
| Omignano Scale | city | Campania | Italy | 40.25 | 15.13 | 269 | 9079 |
| Orcazzo | city | Campania | Italy | 40.10 | 15.52 | 830 | 8197 |
| Orchi | city | Campania | Italy | 41.32 | 14.00 | 1669 | 9216 |
| Orneta | city | Campania | Italy | 41.10 | 15.10 | 1256 | 15442 |
| Orria | city | Campania | Italy | 40.30 | 15.17 | 1669 | 4799 |
| Ortodonico | city | Campania | Italy | 40.23 | 15.00 | 830 | 6447 |
| Ospedaletto d'Alpinolo | city | Campania | Italy | 40.93 | 14.75 | 1669 | 70222 |
| Ospedaletto d’Alpinolo | city | Campania | Italy | 40.93 | 14.75 | 1669 | 70222 |
| Ostigliano | city | Campania | Italy | 40.32 | 15.15 | 1669 | 4111 |
| Ottati | city | Campania | Italy | 40.47 | 15.32 | 1932 | 2531 |
| Ottaviano | city | Campania | Italy | 40.85 | 14.47 | 830 | 112597 |