| Rhondda to Noventa Vicentina | 810.62 mi (1,304.56 km) |
| Rhondda to Novi di Modena | 803.74 mi (1,293.50 km) |
| Rhondda to Novi Ligure | 733.46 mi (1,180.40 km) |
| Rhondda to Nuoro | 989.22 mi (1,591.99 km) |
| Rhondda to Occhiobello | 828.05 mi (1,332.62 km) |
| Rhondda to Oderzo | 827.55 mi (1,331.82 km) |
| Rhondda to Oggiono | 706.52 mi (1,137.03 km) |
| Rhondda to Olbia | 959.99 mi (1,544.96 km) |
| Rhondda to Oleggio | 688.39 mi (1,107.86 km) |
| Rhondda to Olgiate Comasco | 692.31 mi (1,114.17 km) |
| Rhondda to Olgiate Olona | 695.97 mi (1,120.06 km) |
| Rhondda to Omegna | 667.54 mi (1,074.29 km) |
| Rhondda to Opera | 719.49 mi (1,157.91 km) |
| Rhondda to Oppeano | 796.54 mi (1,281.90 km) |
| Rhondda to Orbassano | 678.32 mi (1,091.64 km) |
