| Ub to Olympia Heights (Florida) | 5,470.52 mi (8,803.96 km) |
| Ub to Omaha (Nebraska) | 5,317.51 mi (8,557.71 km) |
| Ub to On Top of the World Designated Place (Florida) | 5,392.16 mi (8,677.85 km) |
| Ub to Onalaska (Wisconsin) | 5,017.13 mi (8,074.30 km) |
| Ub to Oneida (New York) | 4,475.27 mi (7,202.25 km) |
| Ub to Oneonta (New York) | 4,478.13 mi (7,206.85 km) |
| Ub to Ontario (California) | 6,397.97 mi (10,296.53 km) |
| Ub to Ontario (Oregon) | 5,777.93 mi (9,298.68 km) |
| Ub to Opa-locka (Florida) | 5,458.32 mi (8,784.31 km) |
| Ub to Opelika (Alabama) | 5,348.86 mi (8,608.15 km) |
| Ub to Opelousas (Louisiana) | 5,726.81 mi (9,216.41 km) |
| Ub to Orange (California) | 6,418.17 mi (10,329.04 km) |
| Ub to Orange (Texas) | 5,813.91 mi (9,356.58 km) |
| Ub to Orange City (Florida) | 5,357.30 mi (8,621.75 km) |
| Ub to Orangeburg (South Carolina) | 5,121.61 mi (8,242.44 km) |
