| Swansea to Nuth | 4,444.12 mi (7,152.13 km) |
| Swansea to Oegstgeest | 4,347.98 mi (6,997.39 km) |
| Swansea to Oirschot | 4,402.10 mi (7,084.50 km) |
| Swansea to Oisterwijk | 4,395.52 mi (7,073.90 km) |
| Swansea to Oldebroek | 4,391.77 mi (7,067.87 km) |
| Swansea to Oldenzaal | 4,434.10 mi (7,136.00 km) |
| Swansea to Ommen | 4,408.33 mi (7,094.53 km) |
| Swansea to Oosterend | 4,378.92 mi (7,047.19 km) |
| Swansea to Oosterhout | 4,380.67 mi (7,050.01 km) |
| Swansea to Oosterwolde | 4,387.51 mi (7,061.01 km) |
| Swansea to Oostzaan | 4,355.01 mi (7,008.72 km) |
| Swansea to Opmeer | 4,348.53 mi (6,998.28 km) |
| Swansea to Oss | 4,401.04 mi (7,082.78 km) |
| Swansea to Oud-Beijerland | 4,357.75 mi (7,013.12 km) |
| Swansea to Oudenbosch | 4,370.03 mi (7,032.88 km) |
