| South Sioux City to Oerlinghausen | 4,530.77 mi (7,291.57 km) |
| South Sioux City to Oestrich-Winkel | 4,593.03 mi (7,391.77 km) |
| South Sioux City to Offenburg | 4,657.43 mi (7,495.40 km) |
| South Sioux City to Oftersheim | 4,640.74 mi (7,468.54 km) |
| South Sioux City to Ohrdruf | 4,649.52 mi (7,482.68 km) |
| South Sioux City to Ohringen | 4,680.02 mi (7,531.76 km) |
| South Sioux City to Olbernhau | 4,742.66 mi (7,632.57 km) |
| South Sioux City to Olching | 4,787.88 mi (7,705.35 km) |
| South Sioux City to Oldenburg | 4,465.55 mi (7,186.61 km) |
| South Sioux City to Oldenburg in Holstein | 4,501.36 mi (7,244.24 km) |
| South Sioux City to Olfen | 4,498.38 mi (7,239.44 km) |
| South Sioux City to Olpe | 4,543.50 mi (7,312.05 km) |
| South Sioux City to Olsberg | 4,551.20 mi (7,324.44 km) |
| South Sioux City to Oranienburg | 4,644.07 mi (7,473.91 km) |
| South Sioux City to Ortenberg | 4,613.80 mi (7,425.19 km) |
