| Houilles to Novi di Modena | 496.23 mi (798.60 km) |
| Houilles to Novi Ligure | 424.06 mi (682.46 km) |
| Houilles to Nuoro | 690.14 mi (1,110.67 km) |
| Houilles to Occhiobello | 521.91 mi (839.93 km) |
| Houilles to Oderzo | 528.43 mi (850.42 km) |
| Houilles to Oggiono | 399.11 mi (642.31 km) |
| Houilles to Olbia | 658.22 mi (1,059.31 km) |
| Houilles to Oleggio | 379.40 mi (610.59 km) |
| Houilles to Olgiate Comasco | 384.21 mi (618.32 km) |
| Houilles to Olgiate Olona | 387.35 mi (623.37 km) |
| Houilles to Omegna | 358.84 mi (577.50 km) |
| Houilles to Opera | 410.75 mi (661.03 km) |
| Houilles to Oppeano | 491.09 mi (790.33 km) |
| Houilles to Orbassano | 369.81 mi (595.15 km) |
| Houilles to Orbetello | 624.13 mi (1,004.45 km) |
