| Mut to Olympia Heights (Florida) | 6,346.81 mi (10,214.20 km) |
| Mut to Omaha (Nebraska) | 6,179.02 mi (9,944.17 km) |
| Mut to On Top of the World Designated Place (Florida) | 6,273.94 mi (10,096.93 km) |
| Mut to Onalaska (Wisconsin) | 5,881.83 mi (9,465.89 km) |
| Mut to Oneida (New York) | 5,357.44 mi (8,621.97 km) |
| Mut to Oneonta (New York) | 5,360.94 mi (8,627.59 km) |
| Mut to Ontario (California) | 7,209.76 mi (11,602.99 km) |
| Mut to Ontario (Oregon) | 6,563.45 mi (10,562.85 km) |
| Mut to Opa-locka (Florida) | 6,334.75 mi (10,194.80 km) |
| Mut to Opelika (Alabama) | 6,232.46 mi (10,030.18 km) |
| Mut to Opelousas (Louisiana) | 6,608.92 mi (10,636.04 km) |
| Mut to Orange (California) | 7,229.62 mi (11,634.94 km) |
| Mut to Orange (Texas) | 6,695.17 mi (10,774.83 km) |
| Mut to Orange City (Florida) | 6,238.26 mi (10,039.52 km) |
| Mut to Orangeburg (South Carolina) | 6,005.02 mi (9,664.15 km) |
