| Harmanli to Obernburg am Main | 970.24 mi (1,561.44 km) |
| Harmanli to Obernkirchen | 1,059.62 mi (1,705.29 km) |
| Harmanli to Oberschleissheim | 822.21 mi (1,323.21 km) |
| Harmanli to Oberstdorf | 853.65 mi (1,373.82 km) |
| Harmanli to Obertraubling | 822.10 mi (1,323.04 km) |
| Harmanli to Obertshausen | 989.68 mi (1,592.73 km) |
| Harmanli to Oberursel | 1,004.14 mi (1,616.00 km) |
| Harmanli to Ochsenfurt | 927.66 mi (1,492.92 km) |
| Harmanli to Ochsenhausen | 884.84 mi (1,424.02 km) |
| Harmanli to Ochtrup | 1,125.17 mi (1,810.78 km) |
| Harmanli to Odenthal | 1,087.59 mi (1,750.30 km) |
| Harmanli to Oelde | 1,076.93 mi (1,733.15 km) |
| Harmanli to Oelsnitz | 877.98 mi (1,412.98 km) |
| Harmanli to Oer-Erkenschwick | 1,102.96 mi (1,775.05 km) |
| Harmanli to Oerlinghausen | 1,063.53 mi (1,711.58 km) |
