| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oakdale | city | North Dakota | United States | 47.47 | -102.86 | 2509 | |
| Oakes | city | North Dakota | United States | 46.14 | -98.09 | 1669 | |
| Oakwood | city | North Dakota | United States | 48.43 | -97.30 | 830 | |
| Oberon | city | North Dakota | United States | 47.92 | -99.20 | 1669 | |
| Odell (historical) | city | North Dakota | United States | 47.06 | -98.20 | 1669 | |
| Ojata (historical) | city | North Dakota | United States | 47.92 | -97.27 | 849 | |
| Olga | city | North Dakota | United States | 48.80 | -98.04 | 1669 | |
| Omemee | city | North Dakota | United States | 48.71 | -100.36 | 1669 | |
| On-a-Slant Village (historical) | city | North Dakota | United States | 46.77 | -100.85 | 1699 | |
| Ops | city | North Dakota | United States | 48.23 | -97.60 | 925 | |
| Oriska | city | North Dakota | United States | 46.93 | -97.79 | 1669 | |
| Orr | city | North Dakota | United States | 48.09 | -97.68 | 1092 | |
| Orrin | city | North Dakota | United States | 48.09 | -100.16 | 1669 | |
| Osnabrock | city | North Dakota | United States | 48.67 | -98.15 | 1669 | |
| Oswald | city | North Dakota | United States | 46.06 | -96.73 | 980 | |
| Ottention (historical) | city | North Dakota | United States | 49.00 | -97.56 | 830 | |
| Otter Creek | city | North Dakota | United States | 47.05 | -101.56 | 2509 | |
| Overly | city | North Dakota | United States | 48.68 | -100.15 | 1669 | |
| Oxbow | city | North Dakota | United States | 46.67 | -96.81 | 905 |