| Harmanli to Oakley (California) | 6,549.83 mi (10,540.93 km) |
| Harmanli to Oakton (Virginia) | 5,064.78 mi (8,150.98 km) |
| Harmanli to Oakville (Missouri) | 5,589.81 mi (8,995.94 km) |
| Harmanli to Oatfield (Oregon) | 6,096.94 mi (9,812.07 km) |
| Harmanli to Ocala (Florida) | 5,724.13 mi (9,212.10 km) |
| Harmanli to Ocean Acres (New Jersey) | 4,903.20 mi (7,890.93 km) |
| Harmanli to Ocean City (New Jersey) | 4,937.26 mi (7,945.75 km) |
| Harmanli to Ocean Pines (Maryland) | 4,998.90 mi (8,044.95 km) |
| Harmanli to Ocean Pointe (Hawaii) | 8,059.58 mi (12,970.64 km) |
| Harmanli to Ocean Springs (Mississippi) | 5,939.91 mi (9,559.36 km) |
| Harmanli to Oceanside (California) | 6,743.29 mi (10,852.27 km) |
| Harmanli to Oceanside (New York) | 4,838.10 mi (7,786.18 km) |
| Harmanli to Ocoee (Florida) | 5,726.38 mi (9,215.72 km) |
| Harmanli to Oconomowoc (Wisconsin) | 5,290.48 mi (8,514.20 km) |
| Harmanli to Odenton (Maryland) | 5,032.04 mi (8,098.29 km) |
