| Great Falls to Nuth | 4,684.92 mi (7,539.65 km) |
| Great Falls to Oegstgeest | 4,578.96 mi (7,369.12 km) |
| Great Falls to Oirschot | 4,637.90 mi (7,463.98 km) |
| Great Falls to Oisterwijk | 4,630.74 mi (7,452.46 km) |
| Great Falls to Oldebroek | 4,605.03 mi (7,411.09 km) |
| Great Falls to Oldenzaal | 4,640.36 mi (7,467.94 km) |
| Great Falls to Ommen | 4,615.73 mi (7,428.30 km) |
| Great Falls to Oosterend | 4,580.69 mi (7,371.90 km) |
| Great Falls to Oosterhout | 4,617.94 mi (7,431.86 km) |
| Great Falls to Oosterwolde | 4,587.50 mi (7,382.87 km) |
| Great Falls to Oostzaan | 4,577.71 mi (7,367.11 km) |
| Great Falls to Opmeer | 4,565.76 mi (7,347.89 km) |
| Great Falls to Oss | 4,630.07 mi (7,451.38 km) |
| Great Falls to Oud-Beijerland | 4,596.01 mi (7,396.57 km) |
| Great Falls to Oudenbosch | 4,611.30 mi (7,421.17 km) |
