| Merthyr Tudful to Noventa Vicentina | 813.11 mi (1,308.57 km) |
| Merthyr Tudful to Novi di Modena | 806.67 mi (1,298.20 km) |
| Merthyr Tudful to Novi Ligure | 737.22 mi (1,186.45 km) |
| Merthyr Tudful to Nuoro | 994.53 mi (1,600.54 km) |
| Merthyr Tudful to Occhiobello | 830.73 mi (1,336.94 km) |
| Merthyr Tudful to Oderzo | 829.46 mi (1,334.89 km) |
| Merthyr Tudful to Oggiono | 709.46 mi (1,141.76 km) |
| Merthyr Tudful to Olbia | 965.07 mi (1,553.14 km) |
| Merthyr Tudful to Oleggio | 691.72 mi (1,113.22 km) |
| Merthyr Tudful to Olgiate Comasco | 695.40 mi (1,119.13 km) |
| Merthyr Tudful to Olgiate Olona | 699.19 mi (1,125.23 km) |
| Merthyr Tudful to Omegna | 670.78 mi (1,079.51 km) |
| Merthyr Tudful to Opera | 722.73 mi (1,163.12 km) |
| Merthyr Tudful to Oppeano | 799.14 mi (1,286.09 km) |
| Merthyr Tudful to Orbassano | 682.44 mi (1,098.28 km) |
