| Castellammare del Golfo to Oerlinghausen | 984.51 mi (1,584.42 km) |
| Castellammare del Golfo to Oestrich-Winkel | 861.63 mi (1,386.65 km) |
| Castellammare del Golfo to Offenburg | 762.69 mi (1,227.44 km) |
| Castellammare del Golfo to Oftersheim | 812.30 mi (1,307.27 km) |
| Castellammare del Golfo to Ohrdruf | 890.74 mi (1,433.50 km) |
| Castellammare del Golfo to Ohringen | 790.11 mi (1,271.56 km) |
| Castellammare del Golfo to Olbernhau | 873.64 mi (1,405.99 km) |
| Castellammare del Golfo to Olching | 707.30 mi (1,138.29 km) |
| Castellammare del Golfo to Oldenburg | 1,068.04 mi (1,718.84 km) |
| Castellammare del Golfo to Oldenburg in Holstein | 1,128.34 mi (1,815.88 km) |
| Castellammare del Golfo to Olfen | 982.75 mi (1,581.58 km) |
| Castellammare del Golfo to Olpe | 930.78 mi (1,497.94 km) |
| Castellammare del Golfo to Olsberg | 945.13 mi (1,521.04 km) |
| Castellammare del Golfo to Oranienburg | 1,017.75 mi (1,637.91 km) |
| Castellammare del Golfo to Ortenberg | 872.39 mi (1,403.98 km) |
