| Merthyr Tudful to Orthez | 583.04 mi (938.31 km) |
| Merthyr Tudful to Orvault | 318.79 mi (513.05 km) |
| Merthyr Tudful to Osny | 302.84 mi (487.38 km) |
| Merthyr Tudful to Ostwald | 537.62 mi (865.22 km) |
| Merthyr Tudful to Ouistreham | 218.52 mi (351.67 km) |
| Merthyr Tudful to Oullins | 558.48 mi (898.79 km) |
| Merthyr Tudful to Outreau | 226.75 mi (364.92 km) |
| Merthyr Tudful to Oyonnax | 557.29 mi (896.87 km) |
| Merthyr Tudful to Ozoir-la-Ferriere | 336.82 mi (542.06 km) |
| Merthyr Tudful to Pace | 258.42 mi (415.89 km) |
| Merthyr Tudful to Palaiseau | 324.76 mi (522.65 km) |
| Merthyr Tudful to Pamiers | 639.65 mi (1,029.42 km) |
| Merthyr Tudful to Panazol | 460.15 mi (740.53 km) |
| Merthyr Tudful to Pantin | 321.85 mi (517.97 km) |
| Merthyr Tudful to Paray-le-Monial | 498.23 mi (801.83 km) |
