| Bolton to Orbetello | 991.45 mi (1,595.58 km) |
| Bolton to Oria | 1,298.73 mi (2,090.10 km) |
| Bolton to Oristano | 1,076.35 mi (1,732.22 km) |
| Bolton to Orta Nova | 1,191.03 mi (1,916.78 km) |
| Bolton to Orte | 1,024.93 mi (1,649.47 km) |
| Bolton to Ortona | 1,093.85 mi (1,760.38 km) |
| Bolton to Orvieto | 1,002.26 mi (1,612.98 km) |
| Bolton to Orzinuovi | 789.79 mi (1,271.05 km) |
| Bolton to Osimo | 1,003.99 mi (1,615.76 km) |
| Bolton to Ospitaletto | 785.99 mi (1,264.93 km) |
| Bolton to Ostuni | 1,284.61 mi (2,067.38 km) |
| Bolton to Ottaviano | 1,178.48 mi (1,896.58 km) |
| Bolton to Ovada | 793.34 mi (1,276.76 km) |
| Bolton to Ozieri | 1,043.64 mi (1,679.57 km) |
| Bolton to Paceco | 1,291.11 mi (2,077.84 km) |
