| Gulf Shores to Oerlinghausen | 4,853.06 mi (7,810.25 km) |
| Gulf Shores to Oestrich-Winkel | 4,882.57 mi (7,857.74 km) |
| Gulf Shores to Offenburg | 4,923.97 mi (7,924.37 km) |
| Gulf Shores to Oftersheim | 4,924.49 mi (7,925.20 km) |
| Gulf Shores to Ohrdruf | 4,967.09 mi (7,993.76 km) |
| Gulf Shores to Ohringen | 4,966.82 mi (7,993.32 km) |
| Gulf Shores to Olbernhau | 5,073.51 mi (8,165.02 km) |
| Gulf Shores to Olching | 5,071.74 mi (8,162.17 km) |
| Gulf Shores to Oldenburg | 4,802.76 mi (7,729.29 km) |
| Gulf Shores to Oldenburg in Holstein | 4,869.42 mi (7,836.57 km) |
| Gulf Shores to Olfen | 4,809.91 mi (7,740.81 km) |
| Gulf Shores to Olpe | 4,847.12 mi (7,800.69 km) |
| Gulf Shores to Olsberg | 4,863.40 mi (7,826.89 km) |
| Gulf Shores to Oranienburg | 5,003.21 mi (8,051.90 km) |
| Gulf Shores to Ortenberg | 4,914.72 mi (7,909.48 km) |
