| Tuscaloosa to Olympia (Washington) | 2,073.74 mi (3,337.36 km) |
| Tuscaloosa to Olympia Heights (Florida) | 675.01 mi (1,086.33 km) |
| Tuscaloosa to Omaha (Nebraska) | 725.55 mi (1,167.66 km) |
| Tuscaloosa to On Top of the World Designated Place (Florida) | 421.02 mi (677.56 km) |
| Tuscaloosa to Onalaska (Wisconsin) | 762.25 mi (1,226.73 km) |
| Tuscaloosa to Oneida (New York) | 935.13 mi (1,504.94 km) |
| Tuscaloosa to Oneonta (New York) | 929.81 mi (1,496.38 km) |
| Tuscaloosa to Ontario (California) | 1,724.97 mi (2,776.07 km) |
| Tuscaloosa to Ontario (Oregon) | 1,743.18 mi (2,805.38 km) |
| Tuscaloosa to Opa-locka (Florida) | 668.76 mi (1,076.27 km) |
| Tuscaloosa to Opelika (Alabama) | 130.80 mi (210.50 km) |
| Tuscaloosa to Opelousas (Louisiana) | 326.23 mi (525.01 km) |
| Tuscaloosa to Orange (California) | 1,739.20 mi (2,798.97 km) |
| Tuscaloosa to Orange (Texas) | 424.84 mi (683.71 km) |
| Tuscaloosa to Orange City (Florida) | 473.68 mi (762.32 km) |
