| Leiria to Nuth | 1,046.87 mi (1,684.78 km) |
| Leiria to Oegstgeest | 1,065.95 mi (1,715.49 km) |
| Leiria to Oirschot | 1,056.10 mi (1,699.63 km) |
| Leiria to Oisterwijk | 1,057.13 mi (1,701.28 km) |
| Leiria to Oldebroek | 1,120.68 mi (1,803.56 km) |
| Leiria to Oldenzaal | 1,145.39 mi (1,843.33 km) |
| Leiria to Ommen | 1,139.27 mi (1,833.48 km) |
| Leiria to Oosterend | 1,153.09 mi (1,855.72 km) |
| Leiria to Oosterhout | 1,049.80 mi (1,689.48 km) |
| Leiria to Oosterwolde | 1,158.89 mi (1,865.05 km) |
| Leiria to Oostzaan | 1,090.56 mi (1,755.09 km) |
| Leiria to Opmeer | 1,106.18 mi (1,780.22 km) |
| Leiria to Oss | 1,075.68 mi (1,731.14 km) |
| Leiria to Oud-Beijerland | 1,045.21 mi (1,682.10 km) |
| Leiria to Oudenbosch | 1,037.26 mi (1,669.31 km) |
