| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oo-moo-chah (historical) | city | California | United States | 38.41 | -121.37 | 36 | |
| Oolite | city | Kentucky | United States | 38.07 | -86.28 | 830 | |
| Oolitic | city | Indiana | United States | 38.90 | -86.53 | 830 | |
| Oologah | city | Oklahoma | United States | 36.45 | -95.71 | 830 | |
| Ooltewah | city | Tennessee | United States | 35.08 | -85.06 | 1079 | |
| Oostanaula | city | Georgia | United States | 34.48 | -85.01 | 830 | |
| Oostburg | city | Wisconsin | United States | 43.62 | -87.79 | 830 | |
| Oot Park | city | New York | United States | 43.06 | -76.03 | 830 | |
| Ootens Store (historical) | city | Kentucky | United States | 36.74 | -85.24 | 875 | |
| Oowala | city | Oklahoma | United States | 36.42 | -95.61 | 830 |