| Onalaska to Opwijk | 4,164.47 mi (6,702.07 km) |
| Onalaska to Ostend | 4,108.96 mi (6,612.72 km) |
| Onalaska to Oud-Heverlee | 4,187.05 mi (6,738.41 km) |
| Onalaska to Oud-Turnhout | 4,179.40 mi (6,726.09 km) |
| Onalaska to Oudenaarde | 4,147.96 mi (6,675.50 km) |
| Onalaska to Oudenburg | 4,113.49 mi (6,620.02 km) |
| Onalaska to Oupeye | 4,226.98 mi (6,802.66 km) |
| Onalaska to Overijse | 4,184.22 mi (6,733.85 km) |
| Onalaska to Overpelt | 4,198.73 mi (6,757.21 km) |
| Onalaska to Paal | 4,197.06 mi (6,754.52 km) |
| Onalaska to Peer | 4,203.36 mi (6,764.66 km) |
| Onalaska to Pepinster | 4,238.84 mi (6,821.75 km) |
| Onalaska to Peruwelz | 4,160.26 mi (6,695.30 km) |
| Onalaska to Perwez | 4,200.62 mi (6,760.24 km) |
| Onalaska to Philippeville | 4,207.77 mi (6,771.76 km) |
