| Tonypandy to Oerlinghausen | 517.78 mi (833.29 km) |
| Tonypandy to Oestrich-Winkel | 511.78 mi (823.62 km) |
| Tonypandy to Offenburg | 549.43 mi (884.22 km) |
| Tonypandy to Oftersheim | 550.67 mi (886.22 km) |
| Tonypandy to Ohrdruf | 615.22 mi (990.10 km) |
| Tonypandy to Ohringen | 593.40 mi (954.98 km) |
| Tonypandy to Olbernhau | 728.91 mi (1,173.07 km) |
| Tonypandy to Olching | 696.85 mi (1,121.48 km) |
| Tonypandy to Oldenburg | 502.45 mi (808.62 km) |
| Tonypandy to Oldenburg in Holstein | 623.34 mi (1,003.17 km) |
| Tonypandy to Olfen | 463.89 mi (746.56 km) |
| Tonypandy to Olpe | 488.59 mi (786.30 km) |
| Tonypandy to Olsberg | 513.25 mi (826.00 km) |
| Tonypandy to Oranienburg | 709.58 mi (1,141.96 km) |
| Tonypandy to Ortenberg | 550.22 mi (885.50 km) |
