| Castelletto sopra Ticino to Oerlinghausen | 431.84 mi (694.97 km) |
| Castelletto sopra Ticino to Oestrich-Winkel | 297.40 mi (478.61 km) |
| Castelletto sopra Ticino to Offenburg | 192.84 mi (310.34 km) |
| Castelletto sopra Ticino to Oftersheim | 252.47 mi (406.31 km) |
| Castelletto sopra Ticino to Ohrdruf | 366.08 mi (589.15 km) |
| Castelletto sopra Ticino to Ohringen | 244.05 mi (392.76 km) |
| Castelletto sopra Ticino to Olbernhau | 404.58 mi (651.11 km) |
| Castelletto sopra Ticino to Olching | 213.17 mi (343.06 km) |
| Castelletto sopra Ticino to Oldenburg | 513.51 mi (826.42 km) |
| Castelletto sopra Ticino to Oldenburg in Holstein | 601.32 mi (967.74 km) |
| Castelletto sopra Ticino to Olfen | 418.44 mi (673.41 km) |
| Castelletto sopra Ticino to Olpe | 368.02 mi (592.28 km) |
| Castelletto sopra Ticino to Olsberg | 389.28 mi (626.49 km) |
| Castelletto sopra Ticino to Oranienburg | 528.48 mi (850.51 km) |
| Castelletto sopra Ticino to Ortenberg | 321.12 mi (516.80 km) |
