| Rome to Olympia Heights (Florida) | 5,190.22 mi (8,352.85 km) |
| Rome to Omaha (Nebraska) | 5,166.88 mi (8,315.30 km) |
| Rome to On Top of the World Designated Place (Florida) | 5,133.10 mi (8,260.93 km) |
| Rome to Onalaska (Wisconsin) | 4,862.09 mi (7,824.78 km) |
| Rome to Oneida (New York) | 4,265.00 mi (6,863.86 km) |
| Rome to Oneonta (New York) | 4,262.47 mi (6,859.79 km) |
| Rome to Ontario (California) | 6,311.27 mi (10,157.01 km) |
| Rome to Ontario (Oregon) | 5,726.58 mi (9,216.05 km) |
| Rome to Opa-locka (Florida) | 5,178.46 mi (8,333.93 km) |
| Rome to Opelika (Alabama) | 5,116.92 mi (8,234.88 km) |
| Rome to Opelousas (Louisiana) | 5,510.32 mi (8,868.01 km) |
| Rome to Orange (California) | 6,331.68 mi (10,189.85 km) |
| Rome to Orange (Texas) | 5,602.28 mi (9,016.00 km) |
| Rome to Orange City (Florida) | 5,094.03 mi (8,198.04 km) |
| Rome to Orangeburg (South Carolina) | 4,877.79 mi (7,850.05 km) |
