| Oak Ridge Township | NW Guilford County. |
| Oak Spring | community in central Rutherford County on Catheys Creek. A post office was there, 1855-1907. |
| Oak Summit | community in N Forsyth County served by post office, 1891-1903. Formerly Flat Branch. |
| Oak Swamp | rises in E Robeson County and flows NE into Big Swamp. |
| Oak Villa | community in E Hertford County. It developed on the old post road from Norfolk, Va., to Wilmington and was a point from which mail was rerouted. |
| Oakanoahs | See South Mountains. |
| Oakboro | town in SW Stanly County. Inc. 1915. Known as Furr City until about 1905. Post office est. 1914 with the coming of the railroad and when Big Lick post office was closed. |
| Oakdale | community on Deep River in SW Guilford County. |
| Oakdale | community in SW Wilkes County between Beaver Creek and Yadkin River. |
| Oakes Ridge | See Oak Knob. |