| Montalegre to Oerlinghausen | 1,042.03 mi (1,676.99 km) |
| Montalegre to Oestrich-Winkel | 943.14 mi (1,517.83 km) |
| Montalegre to Offenburg | 890.76 mi (1,433.53 km) |
| Montalegre to Oftersheim | 944.90 mi (1,520.66 km) |
| Montalegre to Ohrdruf | 1,076.03 mi (1,731.71 km) |
| Montalegre to Ohringen | 976.76 mi (1,571.94 km) |
| Montalegre to Olbernhau | 1,173.72 mi (1,888.91 km) |
| Montalegre to Olching | 1,028.43 mi (1,655.10 km) |
| Montalegre to Oldenburg | 1,077.07 mi (1,733.37 km) |
| Montalegre to Oldenburg in Holstein | 1,212.14 mi (1,950.76 km) |
| Montalegre to Olfen | 987.81 mi (1,589.73 km) |
| Montalegre to Olpe | 974.91 mi (1,568.96 km) |
| Montalegre to Olsberg | 1,011.15 mi (1,627.28 km) |
| Montalegre to Oranienburg | 1,233.89 mi (1,985.76 km) |
| Montalegre to Ortenberg | 995.86 mi (1,602.68 km) |
