| Thetford to Orbetello | 843.28 mi (1,357.13 km) |
| Thetford to Oria | 1,145.09 mi (1,842.84 km) |
| Thetford to Oristano | 940.81 mi (1,514.08 km) |
| Thetford to Orta Nova | 1,038.11 mi (1,670.68 km) |
| Thetford to Orte | 874.59 mi (1,407.51 km) |
| Thetford to Ortona | 941.14 mi (1,514.62 km) |
| Thetford to Orvieto | 851.96 mi (1,371.09 km) |
| Thetford to Orzinuovi | 638.45 mi (1,027.49 km) |
| Thetford to Osimo | 850.96 mi (1,369.49 km) |
| Thetford to Ospitaletto | 634.14 mi (1,020.55 km) |
| Thetford to Ostuni | 1,130.86 mi (1,819.95 km) |
| Thetford to Ottaviano | 1,027.34 mi (1,653.34 km) |
| Thetford to Ovada | 646.59 mi (1,040.59 km) |
| Thetford to Ozieri | 905.26 mi (1,456.87 km) |
| Thetford to Paceco | 1,147.41 mi (1,846.58 km) |
