| Castellammare del Golfo to Novi di Modena | 485.37 mi (781.12 km) |
| Castellammare del Golfo to Novi Ligure | 511.15 mi (822.62 km) |
| Castellammare del Golfo to Nuoro | 247.24 mi (397.89 km) |
| Castellammare del Golfo to Occhiobello | 481.12 mi (774.29 km) |
| Castellammare del Golfo to Oderzo | 536.15 mi (862.84 km) |
| Castellammare del Golfo to Oggiono | 565.71 mi (910.42 km) |
| Castellammare del Golfo to Olbia | 269.01 mi (432.93 km) |
| Castellammare del Golfo to Oleggio | 566.94 mi (912.40 km) |
| Castellammare del Golfo to Olgiate Comasco | 572.30 mi (921.03 km) |
| Castellammare del Golfo to Olgiate Olona | 564.24 mi (908.06 km) |
| Castellammare del Golfo to Omegna | 588.94 mi (947.81 km) |
| Castellammare del Golfo to Opera | 542.15 mi (872.51 km) |
| Castellammare del Golfo to Oppeano | 510.10 mi (820.93 km) |
| Castellammare del Golfo to Orbassano | 555.64 mi (894.21 km) |
| Castellammare del Golfo to Orbetello | 317.33 mi (510.69 km) |
