| Kallithea to Olympia Heights (Florida) | 5,843.37 mi (9,403.99 km) |
| Kallithea to Omaha (Nebraska) | 5,776.37 mi (9,296.17 km) |
| Kallithea to On Top of the World Designated Place (Florida) | 5,784.50 mi (9,309.25 km) |
| Kallithea to Onalaska (Wisconsin) | 5,473.76 mi (8,809.17 km) |
| Kallithea to Oneida (New York) | 4,902.49 mi (7,889.80 km) |
| Kallithea to Oneonta (New York) | 4,901.96 mi (7,888.94 km) |
| Kallithea to Ontario (California) | 6,877.67 mi (11,068.54 km) |
| Kallithea to Ontario (Oregon) | 6,262.77 mi (10,078.96 km) |
| Kallithea to Opa-locka (Florida) | 5,831.60 mi (9,385.05 km) |
| Kallithea to Opelika (Alabama) | 5,762.49 mi (9,273.84 km) |
| Kallithea to Opelousas (Louisiana) | 6,151.42 mi (9,899.76 km) |
| Kallithea to Orange (California) | 6,897.93 mi (11,101.15 km) |
| Kallithea to Orange (Texas) | 6,241.75 mi (10,045.12 km) |
| Kallithea to Orange City (Florida) | 5,745.96 mi (9,247.23 km) |
| Kallithea to Orangeburg (South Carolina) | 5,526.20 mi (8,893.55 km) |
