| Fort Smith to Oerlinghausen | 4,835.13 mi (7,781.39 km) |
| Fort Smith to Oestrich-Winkel | 4,883.30 mi (7,858.91 km) |
| Fort Smith to Offenburg | 4,937.86 mi (7,946.71 km) |
| Fort Smith to Oftersheim | 4,928.78 mi (7,932.11 km) |
| Fort Smith to Ohrdruf | 4,952.70 mi (7,970.60 km) |
| Fort Smith to Ohringen | 4,969.74 mi (7,998.02 km) |
| Fort Smith to Olbernhau | 5,052.38 mi (8,131.03 km) |
| Fort Smith to Olching | 5,077.10 mi (8,170.81 km) |
| Fort Smith to Oldenburg | 4,775.99 mi (7,686.21 km) |
| Fort Smith to Oldenburg in Holstein | 4,825.54 mi (7,765.96 km) |
| Fort Smith to Olfen | 4,797.72 mi (7,721.18 km) |
| Fort Smith to Olpe | 4,839.67 mi (7,788.69 km) |
| Fort Smith to Olsberg | 4,851.24 mi (7,807.32 km) |
| Fort Smith to Oranienburg | 4,965.44 mi (7,991.10 km) |
| Fort Smith to Ortenberg | 4,909.31 mi (7,900.78 km) |
