| Hereford to Orbetello | 928.76 mi (1,494.70 km) |
| Hereford to Oria | 1,250.17 mi (2,011.95 km) |
| Hereford to Oristano | 997.17 mi (1,604.79 km) |
| Hereford to Orta Nova | 1,139.53 mi (1,833.90 km) |
| Hereford to Orte | 966.56 mi (1,555.52 km) |
| Hereford to Ortona | 1,041.99 mi (1,676.92 km) |
| Hereford to Orvieto | 943.91 mi (1,519.08 km) |
| Hereford to Orzinuovi | 735.71 mi (1,184.00 km) |
| Hereford to Osimo | 953.82 mi (1,535.03 km) |
| Hereford to Ospitaletto | 733.39 mi (1,180.28 km) |
| Hereford to Ostuni | 1,236.71 mi (1,990.29 km) |
| Hereford to Ottaviano | 1,121.36 mi (1,804.65 km) |
| Hereford to Ovada | 729.74 mi (1,174.40 km) |
| Hereford to Ozieri | 967.39 mi (1,556.86 km) |
| Hereford to Paceco | 1,220.02 mi (1,963.43 km) |
