| Prairie Ridge to Octeville | 4,866.56 mi (7,831.98 km) |
| Prairie Ridge to Oignies | 4,944.55 mi (7,957.48 km) |
| Prairie Ridge to Oissel | 4,957.10 mi (7,977.68 km) |
| Prairie Ridge to Olivet | 5,061.22 mi (8,145.25 km) |
| Prairie Ridge to Ollioules | 5,438.33 mi (8,752.14 km) |
| Prairie Ridge to Olonne-sur-Mer | 5,030.75 mi (8,096.21 km) |
| Prairie Ridge to Oloron-Sainte-Marie | 5,249.05 mi (8,447.52 km) |
| Prairie Ridge to Onet Village | 5,277.13 mi (8,492.71 km) |
| Prairie Ridge to Onnaing | 4,964.64 mi (7,989.82 km) |
| Prairie Ridge to Orange | 5,352.15 mi (8,613.45 km) |
| Prairie Ridge to Orchies | 4,950.69 mi (7,967.36 km) |
| Prairie Ridge to Orleans | 5,059.29 mi (8,142.14 km) |
| Prairie Ridge to Orly | 5,025.32 mi (8,087.47 km) |
| Prairie Ridge to Ormesson-sur-Marne | 5,026.86 mi (8,089.94 km) |
| Prairie Ridge to Orsay | 5,022.38 mi (8,082.74 km) |
