| Efkarpia to Olympia Heights (Florida) | 5,718.64 mi (9,203.27 km) |
| Efkarpia to Omaha (Nebraska) | 5,608.15 mi (9,025.45 km) |
| Efkarpia to On Top of the World Designated Place (Florida) | 5,650.50 mi (9,093.60 km) |
| Efkarpia to Onalaska (Wisconsin) | 5,306.75 mi (8,540.39 km) |
| Efkarpia to Oneida (New York) | 4,750.86 mi (7,645.78 km) |
| Efkarpia to Oneonta (New York) | 4,752.03 mi (7,647.66 km) |
| Efkarpia to Ontario (California) | 6,696.10 mi (10,776.33 km) |
| Efkarpia to Ontario (Oregon) | 6,076.61 mi (9,779.36 km) |
| Efkarpia to Opa-locka (Florida) | 5,706.66 mi (9,183.98 km) |
| Efkarpia to Opelika (Alabama) | 5,618.10 mi (9,041.46 km) |
| Efkarpia to Opelousas (Louisiana) | 6,001.71 mi (9,658.82 km) |
| Efkarpia to Orange (California) | 6,716.32 mi (10,808.87 km) |
| Efkarpia to Orange (Texas) | 6,090.42 mi (9,801.59 km) |
| Efkarpia to Orange City (Florida) | 5,613.69 mi (9,034.36 km) |
| Efkarpia to Orangeburg (South Carolina) | 5,386.12 mi (8,668.11 km) |
