| Echternach to Olympia Heights (Florida) | 4,741.72 mi (7,631.07 km) |
| Echternach to Omaha (Nebraska) | 4,593.44 mi (7,392.43 km) |
| Echternach to On Top of the World Designated Place (Florida) | 4,656.86 mi (7,494.49 km) |
| Echternach to Onalaska (Wisconsin) | 4,291.03 mi (6,905.75 km) |
| Echternach to Oneida (New York) | 3,736.53 mi (6,013.36 km) |
| Echternach to Oneonta (New York) | 3,739.13 mi (6,017.55 km) |
| Echternach to Ontario (California) | 5,708.76 mi (9,187.36 km) |
| Echternach to Ontario (Oregon) | 5,113.40 mi (8,229.23 km) |
| Echternach to Opa-locka (Florida) | 4,729.36 mi (7,611.17 km) |
| Echternach to Opelika (Alabama) | 4,609.93 mi (7,418.97 km) |
| Echternach to Opelousas (Louisiana) | 4,988.03 mi (8,027.45 km) |
| Echternach to Orange (California) | 5,729.12 mi (9,220.13 km) |
| Echternach to Orange (Texas) | 5,075.50 mi (8,168.23 km) |
| Echternach to Orange City (Florida) | 4,623.07 mi (7,440.12 km) |
| Echternach to Orangeburg (South Carolina) | 4,383.81 mi (7,055.06 km) |
