| Alliance to Oerlinghausen | 4,064.84 mi (6,541.73 km) |
| Alliance to Oestrich-Winkel | 4,103.69 mi (6,604.26 km) |
| Alliance to Offenburg | 4,152.39 mi (6,682.62 km) |
| Alliance to Oftersheim | 4,147.61 mi (6,674.93 km) |
| Alliance to Ohrdruf | 4,180.82 mi (6,728.38 km) |
| Alliance to Ohringen | 4,189.30 mi (6,742.03 km) |
| Alliance to Olbernhau | 4,284.33 mi (6,894.97 km) |
| Alliance to Olching | 4,295.79 mi (6,913.40 km) |
| Alliance to Oldenburg | 4,010.40 mi (6,454.12 km) |
| Alliance to Oldenburg in Holstein | 4,070.16 mi (6,550.29 km) |
| Alliance to Olfen | 4,024.32 mi (6,476.52 km) |
| Alliance to Olpe | 4,063.95 mi (6,540.30 km) |
| Alliance to Olsberg | 4,077.96 mi (6,562.84 km) |
| Alliance to Oranienburg | 4,206.68 mi (6,770.00 km) |
| Alliance to Ortenberg | 4,132.75 mi (6,651.03 km) |
