| Erba to Olympia Heights (Florida) | 4,945.10 mi (7,958.36 km) |
| Erba to Omaha (Nebraska) | 4,866.19 mi (7,831.37 km) |
| Erba to On Top of the World Designated Place (Florida) | 4,875.11 mi (7,845.74 km) |
| Erba to Onalaska (Wisconsin) | 4,562.22 mi (7,342.18 km) |
| Erba to Oneida (New York) | 3,982.64 mi (6,409.44 km) |
| Erba to Oneonta (New York) | 3,982.33 mi (6,408.94 km) |
| Erba to Ontario (California) | 5,999.49 mi (9,655.25 km) |
| Erba to Ontario (Oregon) | 5,411.31 mi (8,708.67 km) |
| Erba to Opa-locka (Florida) | 4,933.04 mi (7,938.96 km) |
| Erba to Opelika (Alabama) | 4,844.98 mi (7,797.24 km) |
| Erba to Opelousas (Louisiana) | 5,231.94 mi (8,419.99 km) |
| Erba to Orange (California) | 6,019.88 mi (9,688.07 km) |
| Erba to Orange (Texas) | 5,321.98 mi (8,564.90 km) |
| Erba to Orange City (Florida) | 4,838.40 mi (7,786.66 km) |
| Erba to Orangeburg (South Carolina) | 4,611.41 mi (7,421.34 km) |
