| Harmanli to Oestrich-Winkel | 1,020.48 mi (1,642.31 km) |
| Harmanli to Offenburg | 981.01 mi (1,578.79 km) |
| Harmanli to Oftersheim | 978.08 mi (1,574.06 km) |
| Harmanli to Ohrdruf | 945.63 mi (1,521.85 km) |
| Harmanli to Ohringen | 935.79 mi (1,506.01 km) |
| Harmanli to Olbernhau | 848.66 mi (1,365.78 km) |
| Harmanli to Olching | 830.98 mi (1,337.34 km) |
| Harmanli to Oldenburg | 1,125.88 mi (1,811.94 km) |
| Harmanli to Oldenburg in Holstein | 1,095.24 mi (1,762.62 km) |
| Harmanli to Olfen | 1,100.67 mi (1,771.35 km) |
| Harmanli to Olpe | 1,059.70 mi (1,705.43 km) |
| Harmanli to Olsberg | 1,047.10 mi (1,685.14 km) |
| Harmanli to Oranienburg | 951.29 mi (1,530.96 km) |
| Harmanli to Ortenberg | 990.69 mi (1,594.36 km) |
| Harmanli to Oschatz | 884.91 mi (1,424.13 km) |
