13 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Oak Island | Brunswick County | 9,789 |
| Oxford | Granville County | 9,069 |
| Ogden | New Hanover County | 8,732 |
| Oak Ridge | Guilford County | 8,029 |
| Oakboro | Stanly County | 2,343 |
| Ocean Isle Beach | Brunswick County | 1,013 |
| Oriental | Pamlico County | 913 |
| Old Fort | McDowell County | 842 |
| Ocracoke | Hyde County | 654 |
| Ossipee | Alamance County | 585 |
| Oak City | Martin County | 261 |
| Old Hundred | Richmond County | 253 |
| Orrum | Robeson County | 61 |