| Senigallia to Oegstgeest | 710.60 mi (1,143.61 km) |
| Senigallia to Oirschot | 651.50 mi (1,048.48 km) |
| Senigallia to Oisterwijk | 658.68 mi (1,060.04 km) |
| Senigallia to Oldebroek | 690.93 mi (1,111.95 km) |
| Senigallia to Oldenzaal | 661.03 mi (1,063.83 km) |
| Senigallia to Ommen | 683.70 mi (1,100.32 km) |
| Senigallia to Oosterend | 720.17 mi (1,159.01 km) |
| Senigallia to Oosterhout | 671.00 mi (1,079.87 km) |
| Senigallia to Oosterwolde | 714.77 mi (1,150.32 km) |
| Senigallia to Oostzaan | 713.86 mi (1,148.84 km) |
| Senigallia to Opmeer | 727.30 mi (1,170.47 km) |
| Senigallia to Oss | 660.77 mi (1,063.40 km) |
| Senigallia to Oud-Beijerland | 692.63 mi (1,114.69 km) |
| Senigallia to Oudenbosch | 677.15 mi (1,089.77 km) |
| Senigallia to Oudewater | 691.12 mi (1,112.26 km) |
