| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oakdale | city | North Dakota | United States | 47.47306 | -102.86444 | 2470 | 61 |
| Oakes | city | North Dakota | United States | 46.13861 | -98.09 | 1302 | 359 |
| Oakwood | city | North Dakota | United States | 48.42694 | -97.295 | 810 | 577 |
| Oberon | city | North Dakota | United States | 47.92306 | -99.20361 | 1597 | 307 |
| Odell historical | city | North Dakota | United States | 47.06472 | -98.19722 | 1420 | 131 |
| Ojata historical | city | North Dakota | United States | 47.9175 | -97.26889 | 849 | 694 |
| Olga | city | North Dakota | United States | 48.79833 | -98.0375 | 1499 | 98 |
| Omemee | city | North Dakota | United States | 48.70639 | -100.35472 | 1502 | 159 |
| On-a-Slant Village historical | city | North Dakota | United States | 46.76694 | -100.84639 | 1699 | 13868 |
| Ops | city | North Dakota | United States | 48.22778 | -97.59667 | 925 | 236 |
| Oriska | city | North Dakota | United States | 46.93056 | -97.78861 | 1269 | 131 |
| Orr | city | North Dakota | United States | 48.09333 | -97.675 | 1092 | 168 |
| Orrin | city | North Dakota | United States | 48.09139 | -100.16278 | 1597 | 182 |
| Osnabrock | city | North Dakota | United States | 48.66889 | -98.15083 | 1607 | 98 |
| Oswald | city | North Dakota | United States | 46.05889 | -96.72778 | 980 | 238 |
| Ottention historical | city | North Dakota | United States | 48.99583 | -97.56056 | 826 | 904 |
| Otter Creek | city | North Dakota | United States | 47.04917 | -101.55472 | 2099 | 117 |
| Overly | city | North Dakota | United States | 48.68194 | -100.14972 | 1545 | 159 |
| Oxbow | city | North Dakota | United States | 46.67 | -96.8 | 898 | 805 |
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