| Grass Valley to Octeville | 5,277.91 mi (8,493.98 km) |
| Grass Valley to Oignies | 5,374.07 mi (8,648.73 km) |
| Grass Valley to Oissel | 5,376.10 mi (8,652.00 km) |
| Grass Valley to Olivet | 5,476.88 mi (8,814.19 km) |
| Grass Valley to Ollioules | 5,849.75 mi (9,414.26 km) |
| Grass Valley to Olonne-sur-Mer | 5,427.98 mi (8,735.49 km) |
| Grass Valley to Oloron-Sainte-Marie | 5,635.76 mi (9,069.88 km) |
| Grass Valley to Onet Village | 5,681.06 mi (9,142.79 km) |
| Grass Valley to Onnaing | 5,395.72 mi (8,683.58 km) |
| Grass Valley to Orange | 5,763.46 mi (9,275.40 km) |
| Grass Valley to Orchies | 5,381.01 mi (8,659.89 km) |
| Grass Valley to Orleans | 5,475.14 mi (8,811.39 km) |
| Grass Valley to Orly | 5,446.16 mi (8,764.74 km) |
| Grass Valley to Ormesson-sur-Marne | 5,448.34 mi (8,768.25 km) |
| Grass Valley to Orsay | 5,442.36 mi (8,758.63 km) |
