| Romano di Lombardia to Olympia Heights (Florida) | 4,976.09 mi (8,008.25 km) |
| Romano di Lombardia to Omaha (Nebraska) | 4,899.24 mi (7,884.56 km) |
| Romano di Lombardia to On Top of the World Designated Place (Florida) | 4,906.81 mi (7,896.75 km) |
| Romano di Lombardia to Onalaska (Wisconsin) | 4,595.28 mi (7,395.38 km) |
| Romano di Lombardia to Oneida (New York) | 4,015.37 mi (6,462.11 km) |
| Romano di Lombardia to Oneonta (New York) | 4,014.98 mi (6,461.49 km) |
| Romano di Lombardia to Ontario (California) | 6,032.07 mi (9,707.68 km) |
| Romano di Lombardia to Ontario (Oregon) | 5,443.24 mi (8,760.05 km) |
| Romano di Lombardia to Opa-locka (Florida) | 4,964.05 mi (7,988.87 km) |
| Romano di Lombardia to Opelika (Alabama) | 4,877.34 mi (7,849.32 km) |
| Romano di Lombardia to Opelousas (Louisiana) | 5,264.56 mi (8,472.49 km) |
| Romano di Lombardia to Orange (California) | 6,052.46 mi (9,740.50 km) |
| Romano di Lombardia to Orange (Texas) | 5,354.68 mi (8,617.52 km) |
| Romano di Lombardia to Orange City (Florida) | 4,869.98 mi (7,837.47 km) |
| Romano di Lombardia to Orangeburg (South Carolina) | 4,643.51 mi (7,473.00 km) |
