| Troina to Oerlinghausen | 1,021.27 mi (1,643.58 km) |
| Troina to Oestrich-Winkel | 904.92 mi (1,456.33 km) |
| Troina to Offenburg | 810.33 mi (1,304.11 km) |
| Troina to Oftersheim | 854.65 mi (1,375.43 km) |
| Troina to Ohrdruf | 921.03 mi (1,482.26 km) |
| Troina to Ohringen | 828.71 mi (1,333.68 km) |
| Troina to Olbernhau | 892.33 mi (1,436.06 km) |
| Troina to Olching | 738.42 mi (1,188.37 km) |
| Troina to Oldenburg | 1,104.42 mi (1,777.39 km) |
| Troina to Oldenburg in Holstein | 1,154.62 mi (1,858.19 km) |
| Troina to Olfen | 1,024.53 mi (1,648.83 km) |
| Troina to Olpe | 972.42 mi (1,564.96 km) |
| Troina to Olsberg | 983.67 mi (1,583.07 km) |
| Troina to Oranienburg | 1,036.48 mi (1,668.05 km) |
| Troina to Ortenberg | 910.59 mi (1,465.45 km) |
