| Sioux City to Nuth | 4,478.22 mi (7,207.00 km) |
| Sioux City to Oegstgeest | 4,377.20 mi (7,044.43 km) |
| Sioux City to Oirschot | 4,433.82 mi (7,135.54 km) |
| Sioux City to Oisterwijk | 4,426.93 mi (7,124.46 km) |
| Sioux City to Oldebroek | 4,415.11 mi (7,105.43 km) |
| Sioux City to Oldenzaal | 4,455.46 mi (7,170.36 km) |
| Sioux City to Ommen | 4,429.76 mi (7,129.01 km) |
| Sioux City to Oosterend | 4,397.90 mi (7,077.73 km) |
| Sioux City to Oosterhout | 4,412.64 mi (7,101.45 km) |
| Sioux City to Oosterwolde | 4,405.95 mi (7,090.70 km) |
| Sioux City to Oostzaan | 4,381.31 mi (7,051.03 km) |
| Sioux City to Opmeer | 4,372.74 mi (7,037.24 km) |
| Sioux City to Oss | 4,430.26 mi (7,129.82 km) |
| Sioux City to Oud-Beijerland | 4,389.77 mi (7,064.66 km) |
| Sioux City to Oudenbosch | 4,403.32 mi (7,086.46 km) |
