| Derry to Olympia Heights (Florida) | 4,115.18 mi (6,622.74 km) |
| Derry to Omaha (Nebraska) | 3,913.50 mi (6,298.17 km) |
| Derry to On Top of the World Designated Place (Florida) | 4,013.50 mi (6,459.11 km) |
| Derry to Onalaska (Wisconsin) | 3,611.19 mi (5,811.65 km) |
| Derry to Oneida (New York) | 3,069.23 mi (4,939.45 km) |
| Derry to Oneonta (New York) | 3,074.23 mi (4,947.49 km) |
| Derry to Ontario (California) | 5,037.79 mi (8,107.53 km) |
| Derry to Ontario (Oregon) | 4,455.99 mi (7,171.22 km) |
| Derry to Opa-locka (Florida) | 4,102.50 mi (6,602.34 km) |
| Derry to Opelika (Alabama) | 3,950.04 mi (6,356.97 km) |
| Derry to Opelousas (Louisiana) | 4,320.22 mi (6,952.73 km) |
| Derry to Orange (California) | 5,058.19 mi (8,140.36 km) |
| Derry to Orange (Texas) | 4,405.77 mi (7,090.41 km) |
| Derry to Orange City (Florida) | 3,983.08 mi (6,410.15 km) |
| Derry to Orangeburg (South Carolina) | 3,731.61 mi (6,005.45 km) |
