| Harmanli to Oignies | 1,236.91 mi (1,990.61 km) |
| Harmanli to Oissel | 1,295.61 mi (2,085.08 km) |
| Harmanli to Olivet | 1,237.97 mi (1,992.32 km) |
| Harmanli to Ollioules | 1,021.87 mi (1,644.54 km) |
| Harmanli to Olonne-sur-Mer | 1,398.60 mi (2,250.82 km) |
| Harmanli to Oloron-Sainte-Marie | 1,346.06 mi (2,166.28 km) |
| Harmanli to Onet Village | 1,182.70 mi (1,903.38 km) |
| Harmanli to Onnaing | 1,209.98 mi (1,947.27 km) |
| Harmanli to Orange | 1,072.92 mi (1,726.70 km) |
| Harmanli to Orchies | 1,226.67 mi (1,974.13 km) |
| Harmanli to Orleans | 1,238.08 mi (1,992.49 km) |
| Harmanli to Orly | 1,228.53 mi (1,977.13 km) |
| Harmanli to Ormesson-sur-Marne | 1,222.79 mi (1,967.89 km) |
| Harmanli to Orsay | 1,236.90 mi (1,990.59 km) |
| Harmanli to Orthez | 1,352.49 mi (2,176.62 km) |
