| Marsciano to Olympia Heights (Florida) | 5,157.50 mi (8,300.19 km) |
| Marsciano to Omaha (Nebraska) | 5,113.69 mi (8,229.69 km) |
| Marsciano to On Top of the World Designated Place (Florida) | 5,096.23 mi (8,201.58 km) |
| Marsciano to Onalaska (Wisconsin) | 4,809.27 mi (7,739.76 km) |
| Marsciano to Oneida (New York) | 4,219.37 mi (6,790.42 km) |
| Marsciano to Oneonta (New York) | 4,217.67 mi (6,787.69 km) |
| Marsciano to Ontario (California) | 6,251.78 mi (10,061.26 km) |
| Marsciano to Ontario (Oregon) | 5,663.75 mi (9,114.92 km) |
| Marsciano to Opa-locka (Florida) | 5,145.64 mi (8,281.11 km) |
| Marsciano to Opelika (Alabama) | 5,075.27 mi (8,167.86 km) |
| Marsciano to Opelousas (Louisiana) | 5,466.41 mi (8,797.34 km) |
| Marsciano to Orange (California) | 6,272.17 mi (10,094.09 km) |
| Marsciano to Orange (Texas) | 5,557.67 mi (8,944.21 km) |
| Marsciano to Orange City (Florida) | 5,057.92 mi (8,139.93 km) |
| Marsciano to Orangeburg (South Carolina) | 4,838.03 mi (7,786.05 km) |
