| Sioux City to Noventa Vicentina | 4,927.33 mi (7,929.77 km) |
| Sioux City to Novi di Modena | 4,922.50 mi (7,922.00 km) |
| Sioux City to Novi Ligure | 4,850.89 mi (7,806.75 km) |
| Sioux City to Nuoro | 5,075.41 mi (8,168.08 km) |
| Sioux City to Occhiobello | 4,945.87 mi (7,959.60 km) |
| Sioux City to Oderzo | 4,938.42 mi (7,947.62 km) |
| Sioux City to Oggiono | 4,825.34 mi (7,765.63 km) |
| Sioux City to Olbia | 5,054.03 mi (8,133.68 km) |
| Sioux City to Oleggio | 4,807.38 mi (7,736.73 km) |
| Sioux City to Olgiate Comasco | 4,811.35 mi (7,743.12 km) |
| Sioux City to Olgiate Olona | 4,815.06 mi (7,749.08 km) |
| Sioux City to Omegna | 4,786.61 mi (7,703.30 km) |
| Sioux City to Opera | 4,838.56 mi (7,786.92 km) |
| Sioux City to Oppeano | 4,913.93 mi (7,908.21 km) |
| Sioux City to Orbassano | 4,793.27 mi (7,714.02 km) |
