| Birmingham to Olympia Heights (Florida) | 4,351.77 mi (7,003.50 km) |
| Birmingham to Omaha (Nebraska) | 4,191.38 mi (6,745.37 km) |
| Birmingham to On Top of the World Designated Place (Florida) | 4,260.35 mi (6,856.36 km) |
| Birmingham to Onalaska (Wisconsin) | 3,888.39 mi (6,257.76 km) |
| Birmingham to Oneida (New York) | 3,332.53 mi (5,363.18 km) |
| Birmingham to Oneonta (New York) | 3,335.64 mi (5,368.19 km) |
| Birmingham to Ontario (California) | 5,319.67 mi (8,561.17 km) |
| Birmingham to Ontario (Oregon) | 4,736.55 mi (7,622.75 km) |
| Birmingham to Opa-locka (Florida) | 4,339.28 mi (6,983.39 km) |
| Birmingham to Opelika (Alabama) | 4,207.92 mi (6,771.99 km) |
| Birmingham to Opelousas (Louisiana) | 4,584.08 mi (7,377.36 km) |
| Birmingham to Orange (California) | 5,340.07 mi (8,594.00 km) |
| Birmingham to Orange (Texas) | 4,671.19 mi (7,517.55 km) |
| Birmingham to Orange City (Florida) | 4,227.79 mi (6,803.97 km) |
| Birmingham to Orangeburg (South Carolina) | 3,984.11 mi (6,411.80 km) |
