| Castelfidardo to Novi di Modena | 164.09 mi (264.08 km) |
| Castelfidardo to Novi Ligure | 252.49 mi (406.35 km) |
| Castelfidardo to Nuoro | 306.91 mi (493.93 km) |
| Castelfidardo to Occhiobello | 140.04 mi (225.38 km) |
| Castelfidardo to Oderzo | 168.23 mi (270.74 km) |
| Castelfidardo to Oggiono | 261.19 mi (420.35 km) |
| Castelfidardo to Olbia | 271.76 mi (437.35 km) |
| Castelfidardo to Oleggio | 283.34 mi (456.00 km) |
| Castelfidardo to Olgiate Comasco | 276.31 mi (444.68 km) |
| Castelfidardo to Olgiate Olona | 274.11 mi (441.14 km) |
| Castelfidardo to Omegna | 302.53 mi (486.88 km) |
| Castelfidardo to Opera | 251.39 mi (404.57 km) |
| Castelfidardo to Oppeano | 172.33 mi (277.33 km) |
| Castelfidardo to Orbassano | 315.91 mi (508.41 km) |
| Castelfidardo to Orbetello | 137.62 mi (221.47 km) |
