| Tuscaloosa to Orbetello | 5,111.18 mi (8,225.65 km) |
| Tuscaloosa to Oria | 5,463.20 mi (8,792.17 km) |
| Tuscaloosa to Oristano | 5,081.66 mi (8,178.14 km) |
| Tuscaloosa to Orta Nova | 5,347.92 mi (8,606.65 km) |
| Tuscaloosa to Orte | 5,161.73 mi (8,307.00 km) |
| Tuscaloosa to Ortona | 5,252.97 mi (8,453.83 km) |
| Tuscaloosa to Orvieto | 5,140.49 mi (8,272.82 km) |
| Tuscaloosa to Orzinuovi | 4,954.01 mi (7,972.71 km) |
| Tuscaloosa to Osimo | 5,172.05 mi (8,323.61 km) |
| Tuscaloosa to Ospitaletto | 4,954.71 mi (7,973.83 km) |
| Tuscaloosa to Ostuni | 5,451.87 mi (8,773.94 km) |
| Tuscaloosa to Ottaviano | 5,312.30 mi (8,549.32 km) |
| Tuscaloosa to Ovada | 4,924.33 mi (7,924.94 km) |
| Tuscaloosa to Ozieri | 5,077.10 mi (8,170.80 km) |
| Tuscaloosa to Paceco | 5,332.37 mi (8,581.63 km) |
