| Swansea to Odenton (Maryland) | 715.90 mi (1,152.13 km) |
| Swansea to Odessa (Texas) | 834.94 mi (1,343.71 km) |
| Swansea to Ogden (Utah) | 1,176.72 mi (1,893.74 km) |
| Swansea to Oildale (California) | 1,610.57 mi (2,591.96 km) |
| Swansea to Ojus (Florida) | 1,041.00 mi (1,675.32 km) |
| Swansea to Okemos (Michigan) | 409.45 mi (658.95 km) |
| Swansea to Oklahoma City (Oklahoma) | 466.56 mi (750.86 km) |
| Swansea to Okmulgee (Oklahoma) | 388.88 mi (625.85 km) |
| Swansea to Olathe (Kansas) | 261.59 mi (420.99 km) |
| Swansea to Old Jamestown (Missouri) | 25.65 mi (41.27 km) |
| Swansea to Oldsmar (Florida) | 838.81 mi (1,349.94 km) |
| Swansea to Olean (New York) | 655.07 mi (1,054.24 km) |
| Swansea to Olive Branch (Mississippi) | 248.14 mi (399.35 km) |
| Swansea to Olivehurst (California) | 1,691.42 mi (2,722.07 km) |
| Swansea to Olney (Maryland) | 695.55 mi (1,119.38 km) |
