| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O-iwa | city | Chuuk | Federated States of Micronesia | 7.45 | 151.88 | 0 | 8647 |
| Oboen | city | Chuuk | Federated States of Micronesia | 7.33 | 151.84 | 3 | 13949 |
| Olip | city | Chuuk | Federated States of Micronesia | 7.33 | 151.61 | 1249 | 24668 |
| Onip | city | Chuuk | Federated States of Micronesia | 7.38 | 151.73 | 0 | 4384 |
| Onip | city | Chuuk | Federated States of Micronesia | 7.33 | 151.61 | 1249 | 24668 |
| Onongoch | city | Chuuk | Federated States of Micronesia | 7.35 | 151.83 | 3 | 12935 |
| Onongot | city | Chuuk | Federated States of Micronesia | 7.35 | 151.83 | 3 | 12935 |
| Opun | city | Chuuk | Federated States of Micronesia | 7.35 | 151.78 | 0 | 6000 |
| Or | city | Chuuk | Federated States of Micronesia | 7.45 | 151.90 | 0 | 5052 |
| Oror en Fein | city | Chuuk | Federated States of Micronesia | 7.35 | 151.83 | 3 | 13886 |