| Castenaso to Olympia Heights (Florida) | 5,078.47 mi (8,173.01 km) |
| Castenaso to Omaha (Nebraska) | 5,008.32 mi (8,060.11 km) |
| Castenaso to On Top of the World Designated Place (Florida) | 5,011.50 mi (8,065.22 km) |
| Castenaso to Onalaska (Wisconsin) | 4,704.37 mi (7,570.96 km) |
| Castenaso to Oneida (New York) | 4,123.41 mi (6,636.00 km) |
| Castenaso to Oneonta (New York) | 4,122.78 mi (6,634.97 km) |
| Castenaso to Ontario (California) | 6,139.60 mi (9,880.74 km) |
| Castenaso to Ontario (Oregon) | 5,548.64 mi (8,929.67 km) |
| Castenaso to Opa-locka (Florida) | 5,066.49 mi (8,153.72 km) |
| Castenaso to Opelika (Alabama) | 4,984.17 mi (8,021.25 km) |
| Castenaso to Opelousas (Louisiana) | 5,372.25 mi (8,645.80 km) |
| Castenaso to Orange (California) | 6,159.99 mi (9,913.54 km) |
| Castenaso to Orange (Texas) | 5,462.59 mi (8,791.19 km) |
| Castenaso to Orange City (Florida) | 4,974.25 mi (8,005.28 km) |
| Castenaso to Orangeburg (South Carolina) | 4,749.51 mi (7,643.59 km) |
