| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ockhuizen | city | Provincie Utrecht | Netherlands | 52.1333333 | 5 | 3 | 83633 |
| Odijk | city | Provincie Utrecht | Netherlands | 52.05 | 5.2333333 | 9 | 77028 |
| Ons Belang | city | Provincie Utrecht | Netherlands | 52.1333333 | 5.3 | 91 | 102901 |
| Oog in Al | city | Provincie Utrecht | Netherlands | 52.0833333 | 5.0833333 | 3 | 195944 |
| Oord | city | Provincie Utrecht | Netherlands | 51.9666667 | 5.2666667 | 16 | 42791 |
| Oud Aa | city | Provincie Utrecht | Netherlands | 52.1833333 | 4.9666667 | 3 | 33858 |
| Oud-Kamerik | city | Provincie Utrecht | Netherlands | 52.1333333 | 4.9 | -3 | 38998 |
| Oud-Leusden | city | Provincie Utrecht | Netherlands | 52.1333333 | 5.3666667 | 22 | 114767 |
| Oud-Loosdrecht | city | Provincie Utrecht | Netherlands | 52.2 | 5.0833333 | -3 | 55189 |
| Oud-Maarsseveen | city | Provincie Utrecht | Netherlands | 52.1666667 | 5.0833333 | -3 | 55189 |
| Oud-Wulven | city | Provincie Utrecht | Netherlands | 52.05 | 5.15 | 6 | 173504 |
| Oud-Zuilen | city | Provincie Utrecht | Netherlands | 52.1333333 | 5.0666667 | 3 | 134961 |
| Oudenrijn | city | Provincie Utrecht | Netherlands | 52.0833333 | 5.0666667 | 3 | 195944 |
| Oudewater | city | Provincie Utrecht | Netherlands | 52.0333333 | 4.8833333 | -3 | 24528 |
| Oudhuizen | city | Provincie Utrecht | Netherlands | 52.2 | 4.9333333 | -6 | 33628 |
| Oudmaarseveen | city | Provincie Utrecht | Netherlands | 52.1666667 | 5.0833333 | -3 | 55189 |
| Oudover | city | Provincie Utrecht | Netherlands | 52.2166667 | 5.0666667 | -6 | 33996 |
| Oukoop | city | Provincie Utrecht | Netherlands | 52.2 | 4.9666667 | -3 | 33858 |
| Overberg | city | Provincie Utrecht | Netherlands | 52.0333333 | 5.5 | 29 | 73660 |
| Overlangbroek | city | Provincie Utrecht | Netherlands | 51.9833333 | 5.3833333 | 16 | 23801 |
| Overvecht | city | Provincie Utrecht | Netherlands | 52.1166667 | 5.1166667 | 3 | 230830 |
| Overvecht-Noord | city | Provincie Utrecht | Netherlands | 52.1166667 | 5.1 | 3 | 230830 |
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