| Broxbourne to Orbetello | 830.54 mi (1,336.63 km) |
| Broxbourne to Oria | 1,142.90 mi (1,839.32 km) |
| Broxbourne to Oristano | 915.90 mi (1,474.01 km) |
| Broxbourne to Orta Nova | 1,033.80 mi (1,663.73 km) |
| Broxbourne to Orte | 865.09 mi (1,392.22 km) |
| Broxbourne to Ortona | 936.38 mi (1,506.96 km) |
| Broxbourne to Orvieto | 842.40 mi (1,355.72 km) |
| Broxbourne to Orzinuovi | 631.07 mi (1,015.61 km) |
| Broxbourne to Osimo | 847.15 mi (1,363.36 km) |
| Broxbourne to Ospitaletto | 627.83 mi (1,010.39 km) |
| Broxbourne to Ostuni | 1,129.09 mi (1,817.10 km) |
| Broxbourne to Ottaviano | 1,019.13 mi (1,640.13 km) |
| Broxbourne to Ovada | 632.13 mi (1,017.32 km) |
| Broxbourne to Ozieri | 882.52 mi (1,420.27 km) |
| Broxbourne to Paceco | 1,129.46 mi (1,817.68 km) |
