| Big Spring to Oerlinghausen | 5,256.14 mi (8,458.94 km) |
| Big Spring to Oestrich-Winkel | 5,310.48 mi (8,546.39 km) |
| Big Spring to Offenburg | 5,369.01 mi (8,640.59 km) |
| Big Spring to Oftersheim | 5,356.93 mi (8,621.15 km) |
| Big Spring to Ohrdruf | 5,374.42 mi (8,649.29 km) |
| Big Spring to Ohringen | 5,397.27 mi (8,686.07 km) |
| Big Spring to Olbernhau | 5,471.22 mi (8,805.07 km) |
| Big Spring to Olching | 5,505.00 mi (8,859.44 km) |
| Big Spring to Oldenburg | 5,194.08 mi (8,359.07 km) |
| Big Spring to Oldenburg in Holstein | 5,236.85 mi (8,427.89 km) |
| Big Spring to Olfen | 5,220.92 mi (8,402.26 km) |
| Big Spring to Olpe | 5,264.30 mi (8,472.08 km) |
| Big Spring to Olsberg | 5,274.21 mi (8,488.02 km) |
| Big Spring to Oranienburg | 5,378.40 mi (8,655.69 km) |
| Big Spring to Ortenberg | 5,334.34 mi (8,584.78 km) |
