| Horta to Nuth | 1,874.99 mi (3,017.50 km) |
| Horta to Oegstgeest | 1,839.94 mi (2,961.10 km) |
| Horta to Oirschot | 1,860.64 mi (2,994.41 km) |
| Horta to Oisterwijk | 1,858.04 mi (2,990.22 km) |
| Horta to Oldebroek | 1,903.22 mi (3,062.93 km) |
| Horta to Oldenzaal | 1,942.64 mi (3,126.38 km) |
| Horta to Ommen | 1,925.38 mi (3,098.60 km) |
| Horta to Oosterend | 1,921.00 mi (3,091.55 km) |
| Horta to Oosterhout | 1,845.01 mi (2,969.26 km) |
| Horta to Oosterwolde | 1,929.67 mi (3,105.50 km) |
| Horta to Oostzaan | 1,861.94 mi (2,996.51 km) |
| Horta to Opmeer | 1,870.25 mi (3,009.87 km) |
| Horta to Oss | 1,874.52 mi (3,016.75 km) |
| Horta to Oud-Beijerland | 1,829.69 mi (2,944.61 km) |
| Horta to Oudenbosch | 1,830.25 mi (2,945.51 km) |
