| Kardzhali to Oegstgeest | 1,218.47 mi (1,960.94 km) |
| Kardzhali to Oirschot | 1,164.85 mi (1,874.64 km) |
| Kardzhali to Oisterwijk | 1,171.34 mi (1,885.08 km) |
| Kardzhali to Oldebroek | 1,175.26 mi (1,891.40 km) |
| Kardzhali to Oldenzaal | 1,133.54 mi (1,824.26 km) |
| Kardzhali to Ommen | 1,159.33 mi (1,865.76 km) |
| Kardzhali to Oosterend | 1,189.98 mi (1,915.10 km) |
| Kardzhali to Oosterhout | 1,186.29 mi (1,909.15 km) |
| Kardzhali to Oosterwolde | 1,181.69 mi (1,901.74 km) |
| Kardzhali to Oostzaan | 1,211.49 mi (1,949.70 km) |
| Kardzhali to Opmeer | 1,218.34 mi (1,960.72 km) |
| Kardzhali to Oss | 1,165.45 mi (1,875.61 km) |
| Kardzhali to Oud-Beijerland | 1,209.17 mi (1,945.97 km) |
| Kardzhali to Oudenbosch | 1,197.30 mi (1,926.87 km) |
| Kardzhali to Oudewater | 1,198.06 mi (1,928.09 km) |
