| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ohaikea (historical) | city | Hawaii | United States | 19.43 | -155.35 | 4402 | |
| Ohaikea Houses (historical) | city | Hawaii | United States | 19.40 | -155.37 | 4189 | |
| Ohia (historical) | city | Hawaii | United States | 19.58 | -155.08 | 944 | |
| Okoe (historical) | city | Hawaii | United States | 19.15 | -155.91 | 150 | |
| Olelomoana (historical) | city | Hawaii | United States | 19.28 | -155.88 | 1049 | |
| Olinda | city | Hawaii | United States | 20.81 | -156.28 | 4189 | |
| Oloewa (historical) | city | Hawaii | United States | 20.75 | -155.98 | 0 | |
| Olohena | city | Hawaii | United States | 22.07 | -159.36 | 830 | |
| Olokele | city | Hawaii | United States | 21.92 | -159.63 | 98 | |
| Olowalu | city | Hawaii | United States | 20.81 | -156.62 | 0 | |
| Onau (historical) | city | Hawaii | United States | 20.62 | -156.43 | 114 | |
| Onomea (historical) | city | Hawaii | United States | 19.81 | -155.10 | 226 | |
| Onouli (historical) | city | Hawaii | United States | 19.52 | -155.92 | 1814 | |
| Opaeopaeilio | city | Hawaii | United States | 22.02 | -159.42 | 830 | |
| Opihikao | city | Hawaii | United States | 19.43 | -154.88 | 0 | |
| Orchidlands Estates | city | Hawaii | United States | 19.56 | -155.02 | 830 | |
| Otani Camp (historical) | city | Hawaii | United States | 20.92 | -156.67 | 830 |