| Sioux City to Oerlinghausen | 4,528.29 mi (7,287.58 km) |
| Sioux City to Oestrich-Winkel | 4,590.57 mi (7,387.81 km) |
| Sioux City to Offenburg | 4,654.99 mi (7,491.47 km) |
| Sioux City to Oftersheim | 4,638.28 mi (7,464.59 km) |
| Sioux City to Ohrdruf | 4,647.04 mi (7,478.68 km) |
| Sioux City to Ohringen | 4,677.56 mi (7,527.80 km) |
| Sioux City to Olbernhau | 4,740.16 mi (7,628.55 km) |
| Sioux City to Olching | 4,785.42 mi (7,701.39 km) |
| Sioux City to Oldenburg | 4,463.06 mi (7,182.60 km) |
| Sioux City to Oldenburg in Holstein | 4,498.85 mi (7,240.20 km) |
| Sioux City to Olfen | 4,495.91 mi (7,235.46 km) |
| Sioux City to Olpe | 4,541.03 mi (7,308.08 km) |
| Sioux City to Olsberg | 4,548.72 mi (7,320.46 km) |
| Sioux City to Oranienburg | 4,641.57 mi (7,469.88 km) |
| Sioux City to Ortenberg | 4,611.33 mi (7,421.22 km) |
