| Walker Mill to Oerlinghausen | 3,999.77 mi (6,437.00 km) |
| Walker Mill to Oestrich-Winkel | 4,028.44 mi (6,483.15 km) |
| Walker Mill to Offenburg | 4,070.01 mi (6,550.04 km) |
| Walker Mill to Oftersheim | 4,070.34 mi (6,550.58 km) |
| Walker Mill to Ohrdruf | 4,113.47 mi (6,619.99 km) |
| Walker Mill to Ohringen | 4,112.67 mi (6,618.70 km) |
| Walker Mill to Olbernhau | 4,220.28 mi (6,791.89 km) |
| Walker Mill to Olching | 4,217.60 mi (6,787.58 km) |
| Walker Mill to Oldenburg | 3,950.34 mi (6,357.46 km) |
| Walker Mill to Oldenburg in Holstein | 4,019.26 mi (6,468.37 km) |
| Walker Mill to Olfen | 3,956.26 mi (6,366.98 km) |
| Walker Mill to Olpe | 3,993.21 mi (6,426.45 km) |
| Walker Mill to Olsberg | 4,009.71 mi (6,453.01 km) |
| Walker Mill to Oranienburg | 4,151.90 mi (6,681.83 km) |
| Walker Mill to Ortenberg | 4,060.72 mi (6,535.09 km) |
