| Mastic to Oerlinghausen | 3,751.58 mi (6,037.59 km) |
| Mastic to Oestrich-Winkel | 3,778.57 mi (6,081.02 km) |
| Mastic to Offenburg | 3,819.19 mi (6,146.39 km) |
| Mastic to Oftersheim | 3,820.17 mi (6,147.96 km) |
| Mastic to Ohrdruf | 3,864.81 mi (6,219.81 km) |
| Mastic to Ohringen | 3,862.56 mi (6,216.19 km) |
| Mastic to Olbernhau | 3,972.15 mi (6,392.56 km) |
| Mastic to Olching | 3,967.25 mi (6,384.67 km) |
| Mastic to Oldenburg | 3,703.16 mi (5,959.66 km) |
| Mastic to Oldenburg in Holstein | 3,774.04 mi (6,073.73 km) |
| Mastic to Olfen | 3,707.57 mi (5,966.76 km) |
| Mastic to Olpe | 3,744.05 mi (6,025.46 km) |
| Mastic to Olsberg | 3,760.96 mi (6,052.67 km) |
| Mastic to Oranienburg | 3,905.68 mi (6,285.59 km) |
| Mastic to Ortenberg | 3,811.31 mi (6,133.71 km) |
