| Sofia to Olympia Heights (Florida) | 5,670.78 mi (9,126.24 km) |
| Sofia to Omaha (Nebraska) | 5,517.17 mi (8,879.03 km) |
| Sofia to On Top of the World Designated Place (Florida) | 5,594.22 mi (9,003.03 km) |
| Sofia to Onalaska (Wisconsin) | 5,217.36 mi (8,396.53 km) |
| Sofia to Oneida (New York) | 4,678.43 mi (7,529.21 km) |
| Sofia to Oneonta (New York) | 4,681.33 mi (7,533.87 km) |
| Sofia to Ontario (California) | 6,588.05 mi (10,602.44 km) |
| Sofia to Ontario (Oregon) | 5,962.06 mi (9,595.01 km) |
| Sofia to Opa-locka (Florida) | 5,658.62 mi (9,106.66 km) |
| Sofia to Opelika (Alabama) | 5,551.98 mi (8,935.05 km) |
| Sofia to Opelousas (Louisiana) | 5,929.98 mi (9,543.38 km) |
| Sofia to Orange (California) | 6,608.20 mi (10,634.86 km) |
| Sofia to Orange (Texas) | 6,017.00 mi (9,683.42 km) |
| Sofia to Orange City (Florida) | 5,559.06 mi (8,946.45 km) |
| Sofia to Orangeburg (South Carolina) | 5,324.39 mi (8,568.78 km) |
