| West Lafayette to Oerlinghausen | 4,302.61 mi (6,924.39 km) |
| West Lafayette to Oestrich-Winkel | 4,348.66 mi (6,998.49 km) |
| West Lafayette to Offenburg | 4,402.15 mi (7,084.57 km) |
| West Lafayette to Oftersheim | 4,393.84 mi (7,071.20 km) |
| West Lafayette to Ohrdruf | 4,419.84 mi (7,113.05 km) |
| West Lafayette to Ohringen | 4,434.96 mi (7,137.37 km) |
| West Lafayette to Olbernhau | 4,520.57 mi (7,275.15 km) |
| West Lafayette to Olching | 4,542.18 mi (7,309.94 km) |
| West Lafayette to Oldenburg | 4,244.68 mi (6,831.15 km) |
| West Lafayette to Oldenburg in Holstein | 4,297.24 mi (6,915.74 km) |
| West Lafayette to Olfen | 4,264.42 mi (6,862.92 km) |
| West Lafayette to Olpe | 4,305.85 mi (6,929.59 km) |
| West Lafayette to Olsberg | 4,318.00 mi (6,949.14 km) |
| West Lafayette to Oranienburg | 4,436.21 mi (7,139.39 km) |
| West Lafayette to Ortenberg | 4,375.33 mi (7,041.42 km) |
