| Fort Dodge to Oerlinghausen | 4,453.13 mi (7,166.62 km) |
| Fort Dodge to Oestrich-Winkel | 4,512.54 mi (7,262.23 km) |
| Fort Dodge to Offenburg | 4,575.06 mi (7,362.85 km) |
| Fort Dodge to Oftersheim | 4,559.85 mi (7,338.36 km) |
| Fort Dodge to Ohrdruf | 4,571.74 mi (7,357.51 km) |
| Fort Dodge to Ohringen | 4,599.50 mi (7,402.18 km) |
| Fort Dodge to Olbernhau | 4,666.38 mi (7,509.81 km) |
| Fort Dodge to Olching | 4,707.37 mi (7,575.77 km) |
| Fort Dodge to Oldenburg | 4,389.15 mi (7,063.66 km) |
| Fort Dodge to Oldenburg in Holstein | 4,428.10 mi (7,126.33 km) |
| Fort Dodge to Olfen | 4,419.65 mi (7,112.73 km) |
| Fort Dodge to Olpe | 4,464.15 mi (7,184.36 km) |
| Fort Dodge to Olsberg | 4,472.66 mi (7,198.06 km) |
| Fort Dodge to Oranienburg | 4,570.30 mi (7,355.18 km) |
| Fort Dodge to Ortenberg | 4,534.39 mi (7,297.40 km) |
