| Great Baddow to Orbetello | 813.59 mi (1,309.35 km) |
| Great Baddow to Oria | 1,123.45 mi (1,808.01 km) |
| Great Baddow to Oristano | 903.00 mi (1,453.24 km) |
| Great Baddow to Orta Nova | 1,014.78 mi (1,633.13 km) |
| Great Baddow to Orte | 847.27 mi (1,363.55 km) |
| Great Baddow to Ortona | 917.43 mi (1,476.47 km) |
| Great Baddow to Orvieto | 824.59 mi (1,327.06 km) |
| Great Baddow to Orzinuovi | 612.60 mi (985.88 km) |
| Great Baddow to Osimo | 827.97 mi (1,332.48 km) |
| Great Baddow to Ospitaletto | 609.10 mi (980.25 km) |
| Great Baddow to Ostuni | 1,109.54 mi (1,785.64 km) |
| Great Baddow to Ottaviano | 1,001.04 mi (1,611.01 km) |
| Great Baddow to Ovada | 615.57 mi (990.66 km) |
| Great Baddow to Ozieri | 868.80 mi (1,398.20 km) |
| Great Baddow to Paceco | 1,114.18 mi (1,793.10 km) |
