| Monte San Giovanni Campano to Oerlinghausen | 749.48 mi (1,206.18 km) |
| Monte San Giovanni Campano to Oestrich-Winkel | 635.77 mi (1,023.17 km) |
| Monte San Giovanni Campano to Offenburg | 544.81 mi (876.79 km) |
| Monte San Giovanni Campano to Oftersheim | 585.20 mi (941.79 km) |
| Monte San Giovanni Campano to Ohrdruf | 648.96 mi (1,044.40 km) |
| Monte San Giovanni Campano to Ohringen | 557.71 mi (897.55 km) |
| Monte San Giovanni Campano to Olbernhau | 624.21 mi (1,004.57 km) |
| Monte San Giovanni Campano to Olching | 466.25 mi (750.36 km) |
| Monte San Giovanni Campano to Oldenburg | 832.51 mi (1,339.80 km) |
| Monte San Giovanni Campano to Oldenburg in Holstein | 883.46 mi (1,421.79 km) |
| Monte San Giovanni Campano to Olfen | 754.28 mi (1,213.89 km) |
| Monte San Giovanni Campano to Olpe | 702.23 mi (1,130.13 km) |
| Monte San Giovanni Campano to Olsberg | 712.34 mi (1,146.41 km) |
| Monte San Giovanni Campano to Oranienburg | 768.50 mi (1,236.79 km) |
| Monte San Giovanni Campano to Ortenberg | 639.28 mi (1,028.83 km) |
