| Addison to Olympia Heights (Florida) | 1,201.93 mi (1,934.32 km) |
| Addison to Omaha (Nebraska) | 418.06 mi (672.80 km) |
| Addison to On Top of the World Designated Place (Florida) | 942.17 mi (1,516.28 km) |
| Addison to Onalaska (Wisconsin) | 210.90 mi (339.41 km) |
| Addison to Oneida (New York) | 633.26 mi (1,019.14 km) |
| Addison to Oneonta (New York) | 662.84 mi (1,066.74 km) |
| Addison to Ontario (California) | 1,691.59 mi (2,722.35 km) |
| Addison to Ontario (Oregon) | 1,463.82 mi (2,355.80 km) |
| Addison to Opa-locka (Florida) | 1,192.24 mi (1,918.73 km) |
| Addison to Opelika (Alabama) | 656.53 mi (1,056.59 km) |
| Addison to Opelousas (Louisiana) | 819.85 mi (1,319.43 km) |
| Addison to Orange (California) | 1,710.09 mi (2,752.13 km) |
| Addison to Orange (Texas) | 876.37 mi (1,410.39 km) |
| Addison to Orange City (Florida) | 973.59 mi (1,566.85 km) |
| Addison to Orangeburg (South Carolina) | 701.05 mi (1,128.22 km) |
