| Pisa to Olympia Heights (Florida) | 5,047.16 mi (8,122.61 km) |
| Pisa to Omaha (Nebraska) | 5,004.27 mi (8,053.60 km) |
| Pisa to On Top of the World Designated Place (Florida) | 4,984.92 mi (8,022.46 km) |
| Pisa to Onalaska (Wisconsin) | 4,699.67 mi (7,563.38 km) |
| Pisa to Oneida (New York) | 4,107.75 mi (6,610.78 km) |
| Pisa to Oneonta (New York) | 4,105.96 mi (6,607.91 km) |
| Pisa to Ontario (California) | 6,146.89 mi (9,892.47 km) |
| Pisa to Ontario (Oregon) | 5,562.90 mi (8,952.62 km) |
| Pisa to Opa-locka (Florida) | 5,035.27 mi (8,103.49 km) |
| Pisa to Opelika (Alabama) | 4,963.48 mi (7,987.95 km) |
| Pisa to Opelousas (Louisiana) | 5,354.65 mi (8,617.48 km) |
| Pisa to Orange (California) | 6,167.30 mi (9,925.31 km) |
| Pisa to Orange (Texas) | 5,445.96 mi (8,764.42 km) |
| Pisa to Orange City (Florida) | 4,946.76 mi (7,961.04 km) |
| Pisa to Orangeburg (South Carolina) | 4,726.35 mi (7,606.32 km) |
