| San Gwann to Olympia Heights (Florida) | 5,448.38 mi (8,768.32 km) |
| San Gwann to Omaha (Nebraska) | 5,528.96 mi (8,898.00 km) |
| San Gwann to On Top of the World Designated Place (Florida) | 5,413.49 mi (8,712.16 km) |
| San Gwann to Onalaska (Wisconsin) | 5,223.09 mi (8,405.75 km) |
| San Gwann to Oneida (New York) | 4,593.12 mi (7,391.91 km) |
| San Gwann to Oneonta (New York) | 4,586.53 mi (7,381.31 km) |
| San Gwann to Ontario (California) | 6,700.71 mi (10,783.75 km) |
| San Gwann to Ontario (Oregon) | 6,131.04 mi (9,866.95 km) |
| San Gwann to Opa-locka (Florida) | 5,437.20 mi (8,750.32 km) |
| San Gwann to Opelika (Alabama) | 5,422.05 mi (8,725.95 km) |
| San Gwann to Opelousas (Louisiana) | 5,825.69 mi (9,375.53 km) |
| San Gwann to Orange (California) | 6,721.14 mi (10,816.62 km) |
| San Gwann to Orange (Texas) | 5,920.93 mi (9,528.81 km) |
| San Gwann to Orange City (Florida) | 5,370.55 mi (8,643.07 km) |
| San Gwann to Orangeburg (South Carolina) | 5,174.19 mi (8,327.05 km) |
