| Siniscola to Olympia Heights (Florida) | 5,087.12 mi (8,186.93 km) |
| Siniscola to Omaha (Nebraska) | 5,119.66 mi (8,239.30 km) |
| Siniscola to On Top of the World Designated Place (Florida) | 5,039.46 mi (8,110.22 km) |
| Siniscola to Onalaska (Wisconsin) | 4,813.98 mi (7,747.35 km) |
| Siniscola to Oneida (New York) | 4,195.12 mi (6,751.39 km) |
| Siniscola to Oneonta (New York) | 4,190.24 mi (6,743.53 km) |
| Siniscola to Ontario (California) | 6,287.10 mi (10,118.11 km) |
| Siniscola to Ontario (Oregon) | 5,718.82 mi (9,203.54 km) |
| Siniscola to Opa-locka (Florida) | 5,075.58 mi (8,168.36 km) |
| Siniscola to Opelika (Alabama) | 5,035.11 mi (8,103.22 km) |
| Siniscola to Opelousas (Louisiana) | 5,434.14 mi (8,745.41 km) |
| Siniscola to Orange (California) | 6,307.53 mi (10,150.99 km) |
| Siniscola to Orange (Texas) | 5,527.94 mi (8,896.36 km) |
| Siniscola to Orange City (Florida) | 4,998.62 mi (8,044.51 km) |
| Siniscola to Orangeburg (South Carolina) | 4,791.44 mi (7,711.07 km) |
