| Swansea to Olympia (Washington) | 1,753.32 mi (2,821.69 km) |
| Swansea to Olympia Heights (Florida) | 1,049.22 mi (1,688.55 km) |
| Swansea to Omaha (Nebraska) | 372.04 mi (598.74 km) |
| Swansea to On Top of the World Designated Place (Florida) | 787.41 mi (1,267.21 km) |
| Swansea to Onalaska (Wisconsin) | 374.21 mi (602.23 km) |
| Swansea to Oneida (New York) | 810.33 mi (1,304.09 km) |
| Swansea to Oneonta (New York) | 827.59 mi (1,331.87 km) |
| Swansea to Ontario (California) | 1,563.18 mi (2,515.70 km) |
| Swansea to Ontario (Oregon) | 1,444.19 mi (2,324.19 km) |
| Swansea to Opa-locka (Florida) | 1,041.36 mi (1,675.90 km) |
| Swansea to Opelika (Alabama) | 482.14 mi (775.93 km) |
| Swansea to Opelousas (Louisiana) | 567.14 mi (912.73 km) |
| Swansea to Orange (California) | 1,580.31 mi (2,543.26 km) |
| Swansea to Orange (Texas) | 620.71 mi (998.94 km) |
| Swansea to Orange City (Florida) | 830.43 mi (1,336.45 km) |
