| Sasso Marconi to Olympia Heights (Florida) | 5,070.85 mi (8,160.75 km) |
| Sasso Marconi to Omaha (Nebraska) | 5,005.13 mi (8,054.98 km) |
| Sasso Marconi to On Top of the World Designated Place (Florida) | 5,004.62 mi (8,054.15 km) |
| Sasso Marconi to Onalaska (Wisconsin) | 4,701.06 mi (7,565.63 km) |
| Sasso Marconi to Oneida (New York) | 4,118.27 mi (6,627.71 km) |
| Sasso Marconi to Oneonta (New York) | 4,117.44 mi (6,626.38 km) |
| Sasso Marconi to Ontario (California) | 6,138.39 mi (9,878.78 km) |
| Sasso Marconi to Ontario (Oregon) | 5,548.63 mi (8,929.66 km) |
| Sasso Marconi to Opa-locka (Florida) | 5,058.88 mi (8,141.48 km) |
| Sasso Marconi to Opelika (Alabama) | 4,978.23 mi (8,011.69 km) |
| Sasso Marconi to Opelousas (Louisiana) | 5,366.82 mi (8,637.07 km) |
| Sasso Marconi to Orange (California) | 6,158.78 mi (9,911.60 km) |
| Sasso Marconi to Orange (Texas) | 5,457.32 mi (8,782.71 km) |
| Sasso Marconi to Orange City (Florida) | 4,967.22 mi (7,993.97 km) |
| Sasso Marconi to Orangeburg (South Carolina) | 4,743.17 mi (7,633.39 km) |
