| Oine | community in NW Warren County. Post office est. there in 1886 but discontinued in 1904. |
| Okay | community in NE Forsyth County served by post office, 1890-1904. |
| Okeewemee | community in N Montgomery County. Name derived from Indian word meaning "land between two rivers." |
| Okie Branch | rises in S Duplin County and flows SE into Northeast Cape Fear River. |
| Okisko | community in W Pasquotank County. Settled prior to 1890. Named for a king of the Yeopim Indians. Alt. 12. |
| Oklawaha | See Mud Creek. |
| Okok | See Ocracoke. |
| Ola | former community in W Haywood County near lat. 35°36'15" N., long. 83°08'00". The site is now within Great Smoky Mountains National Park and abandoned. |
| Old Apalachia | former community in NW Cherokee County below and N of Apalachia Dam near the junction of Shuler Creek with Hiwassee River. |
| Old Bald Creek | rises in S Haywood County and flows NE into Allen Creek. |