| Pirot to Octeville | 1,231.58 mi (1,982.03 km) |
| Pirot to Oignies | 1,050.86 mi (1,691.20 km) |
| Pirot to Oissel | 1,107.60 mi (1,782.51 km) |
| Pirot to Olivet | 1,049.40 mi (1,688.85 km) |
| Pirot to Ollioules | 842.39 mi (1,355.69 km) |
| Pirot to Olonne-sur-Mer | 1,210.87 mi (1,948.70 km) |
| Pirot to Oloron-Sainte-Marie | 1,164.85 mi (1,874.64 km) |
| Pirot to Onet Village | 998.66 mi (1,607.18 km) |
| Pirot to Onnaing | 1,024.05 mi (1,648.05 km) |
| Pirot to Orange | 889.60 mi (1,431.67 km) |
| Pirot to Orchies | 1,040.74 mi (1,674.91 km) |
| Pirot to Orleans | 1,049.50 mi (1,689.01 km) |
| Pirot to Orly | 1,040.25 mi (1,674.11 km) |
| Pirot to Ormesson-sur-Marne | 1,034.55 mi (1,664.94 km) |
| Pirot to Orsay | 1,048.56 mi (1,687.50 km) |
