| Great Dunmow to Orbetello | 825.65 mi (1,328.75 km) |
| Great Dunmow to Oria | 1,134.80 mi (1,826.29 km) |
| Great Dunmow to Oristano | 915.32 mi (1,473.06 km) |
| Great Dunmow to Orta Nova | 1,026.31 mi (1,651.69 km) |
| Great Dunmow to Orte | 859.15 mi (1,382.68 km) |
| Great Dunmow to Ortona | 928.99 mi (1,495.07 km) |
| Great Dunmow to Orvieto | 836.48 mi (1,346.18 km) |
| Great Dunmow to Orzinuovi | 624.32 mi (1,004.75 km) |
| Great Dunmow to Osimo | 839.44 mi (1,350.95 km) |
| Great Dunmow to Ospitaletto | 620.74 mi (998.99 km) |
| Great Dunmow to Ostuni | 1,120.86 mi (1,803.86 km) |
| Great Dunmow to Ottaviano | 1,012.84 mi (1,630.02 km) |
| Great Dunmow to Ovada | 627.69 mi (1,010.17 km) |
| Great Dunmow to Ozieri | 881.12 mi (1,418.02 km) |
| Great Dunmow to Paceco | 1,126.43 mi (1,812.81 km) |
