| Mesolongi to Olympia Heights (Florida) | 5,720.74 mi (9,206.64 km) |
| Mesolongi to Omaha (Nebraska) | 5,672.65 mi (9,129.25 km) |
| Mesolongi to On Top of the World Designated Place (Florida) | 5,664.23 mi (9,115.69 km) |
| Mesolongi to Onalaska (Wisconsin) | 5,369.25 mi (8,640.98 km) |
| Mesolongi to Oneida (New York) | 4,789.08 mi (7,707.29 km) |
| Mesolongi to Oneonta (New York) | 4,787.76 mi (7,705.16 km) |
| Mesolongi to Ontario (California) | 6,786.93 mi (10,922.51 km) |
| Mesolongi to Ontario (Oregon) | 6,179.56 mi (9,945.05 km) |
| Mesolongi to Opa-locka (Florida) | 5,709.02 mi (9,187.78 km) |
| Mesolongi to Opelika (Alabama) | 5,645.71 mi (9,085.89 km) |
| Mesolongi to Opelousas (Louisiana) | 6,036.73 mi (9,715.17 km) |
| Mesolongi to Orange (California) | 6,807.25 mi (10,955.20 km) |
| Mesolongi to Orange (Texas) | 6,127.75 mi (9,861.67 km) |
| Mesolongi to Orange City (Florida) | 5,625.21 mi (9,052.90 km) |
| Mesolongi to Orangeburg (South Carolina) | 5,407.91 mi (8,703.19 km) |
