| Karlovo to Oignies | 1,162.90 mi (1,871.51 km) |
| Karlovo to Oissel | 1,222.44 mi (1,967.32 km) |
| Karlovo to Olivet | 1,166.02 mi (1,876.52 km) |
| Karlovo to Ollioules | 958.35 mi (1,542.31 km) |
| Karlovo to Olonne-sur-Mer | 1,328.55 mi (2,138.09 km) |
| Karlovo to Oloron-Sainte-Marie | 1,281.51 mi (2,062.40 km) |
| Karlovo to Onet Village | 1,116.10 mi (1,796.20 km) |
| Karlovo to Onnaing | 1,135.95 mi (1,828.14 km) |
| Karlovo to Orange | 1,006.84 mi (1,620.35 km) |
| Karlovo to Orchies | 1,152.64 mi (1,854.99 km) |
| Karlovo to Orleans | 1,166.08 mi (1,876.62 km) |
| Karlovo to Orly | 1,155.67 mi (1,859.87 km) |
| Karlovo to Ormesson-sur-Marne | 1,149.87 mi (1,850.54 km) |
| Karlovo to Orsay | 1,164.10 mi (1,873.43 km) |
| Karlovo to Orthez | 1,287.35 mi (2,071.78 km) |
