| Harmanli to Oswego (Illinois) | 5,355.18 mi (8,618.32 km) |
| Harmanli to Oswego (New York) | 4,829.79 mi (7,772.79 km) |
| Harmanli to Otsego (Minnesota) | 5,353.52 mi (8,615.66 km) |
| Harmanli to Ottawa (Illinois) | 5,389.04 mi (8,672.82 km) |
| Harmanli to Ottawa (Kansas) | 5,757.94 mi (9,266.51 km) |
| Harmanli to Ottumwa (Iowa) | 5,532.74 mi (8,904.08 km) |
| Harmanli to Overland (Missouri) | 5,578.94 mi (8,978.43 km) |
| Harmanli to Overland Park (Kansas) | 5,722.75 mi (9,209.88 km) |
| Harmanli to Overlea (Maryland) | 5,011.49 mi (8,065.22 km) |
| Harmanli to Oviedo (Florida) | 5,707.57 mi (9,185.45 km) |
| Harmanli to Owasso (Oklahoma) | 5,900.82 mi (9,496.46 km) |
| Harmanli to Owatonna (Minnesota) | 5,401.57 mi (8,692.99 km) |
| Harmanli to Owensboro (Kentucky) | 5,505.05 mi (8,859.53 km) |
| Harmanli to Owings Mills (Maryland) | 5,020.50 mi (8,079.71 km) |
| Harmanli to Owosso (Michigan) | 5,140.45 mi (8,272.75 km) |
