| Sioux City to Opwijk | 4,416.83 mi (7,108.20 km) |
| Sioux City to Ostend | 4,361.87 mi (7,019.75 km) |
| Sioux City to Oud-Heverlee | 4,439.25 mi (7,144.29 km) |
| Sioux City to Oud-Turnhout | 4,430.41 mi (7,130.05 km) |
| Sioux City to Oudenaarde | 4,401.03 mi (7,082.77 km) |
| Sioux City to Oudenburg | 4,366.41 mi (7,027.06 km) |
| Sioux City to Oupeye | 4,478.57 mi (7,207.57 km) |
| Sioux City to Overijse | 4,436.63 mi (7,140.06 km) |
| Sioux City to Overpelt | 4,449.56 mi (7,160.88 km) |
| Sioux City to Paal | 4,448.44 mi (7,159.07 km) |
| Sioux City to Peer | 4,454.32 mi (7,168.53 km) |
| Sioux City to Pepinster | 4,490.55 mi (7,226.84 km) |
| Sioux City to Peruwelz | 4,413.96 mi (7,103.58 km) |
| Sioux City to Perwez | 4,453.08 mi (7,166.54 km) |
| Sioux City to Philippeville | 4,461.25 mi (7,179.68 km) |
