| South Milwaukee to Opwijk | 4,088.57 mi (6,579.93 km) |
| South Milwaukee to Ostend | 4,032.37 mi (6,489.47 km) |
| South Milwaukee to Oud-Heverlee | 4,111.34 mi (6,616.56 km) |
| South Milwaukee to Oud-Turnhout | 4,105.39 mi (6,606.98 km) |
| South Milwaukee to Oudenaarde | 4,071.08 mi (6,551.77 km) |
| South Milwaukee to Oudenburg | 4,036.87 mi (6,496.71 km) |
| South Milwaukee to Oupeye | 4,152.05 mi (6,682.07 km) |
| South Milwaukee to Overijse | 4,108.22 mi (6,611.53 km) |
| South Milwaukee to Overpelt | 4,124.94 mi (6,638.45 km) |
| South Milwaukee to Paal | 4,122.50 mi (6,634.52 km) |
| South Milwaukee to Peer | 4,129.38 mi (6,645.59 km) |
| South Milwaukee to Pepinster | 4,163.73 mi (6,700.87 km) |
| South Milwaukee to Peruwelz | 4,082.43 mi (6,570.04 km) |
| South Milwaukee to Perwez | 4,124.50 mi (6,637.73 km) |
| South Milwaukee to Philippeville | 4,130.18 mi (6,646.89 km) |
