| Great Falls to Opwijk | 4,633.79 mi (7,457.36 km) |
| Great Falls to Ostend | 4,583.85 mi (7,377.00 km) |
| Great Falls to Oud-Heverlee | 4,654.62 mi (7,490.88 km) |
| Great Falls to Oud-Turnhout | 4,638.50 mi (7,464.94 km) |
| Great Falls to Oudenaarde | 4,622.94 mi (7,439.90 km) |
| Great Falls to Oudenburg | 4,588.37 mi (7,384.27 km) |
| Great Falls to Oupeye | 4,689.06 mi (7,546.31 km) |
| Great Falls to Overijse | 4,653.38 mi (7,488.89 km) |
| Great Falls to Overpelt | 4,656.00 mi (7,493.10 km) |
| Great Falls to Paal | 4,658.35 mi (7,496.89 km) |
| Great Falls to Peer | 4,661.43 mi (7,501.85 km) |
| Great Falls to Pepinster | 4,701.44 mi (7,566.23 km) |
| Great Falls to Peruwelz | 4,639.64 mi (7,466.77 km) |
| Great Falls to Perwez | 4,669.77 mi (7,515.27 km) |
| Great Falls to Philippeville | 4,684.22 mi (7,538.52 km) |
