| Zagarolo to Oerlinghausen | 726.94 mi (1,169.90 km) |
| Zagarolo to Oestrich-Winkel | 609.89 mi (981.53 km) |
| Zagarolo to Offenburg | 516.52 mi (831.26 km) |
| Zagarolo to Oftersheim | 559.58 mi (900.55 km) |
| Zagarolo to Ohrdruf | 629.44 mi (1,012.98 km) |
| Zagarolo to Ohringen | 533.82 mi (859.10 km) |
| Zagarolo to Olbernhau | 610.79 mi (982.98 km) |
| Zagarolo to Olching | 446.06 mi (717.87 km) |
| Zagarolo to Oldenburg | 810.27 mi (1,304.00 km) |
| Zagarolo to Oldenburg in Holstein | 865.97 mi (1,393.65 km) |
| Zagarolo to Olfen | 729.44 mi (1,173.91 km) |
| Zagarolo to Olpe | 677.32 mi (1,090.05 km) |
| Zagarolo to Olsberg | 688.90 mi (1,108.67 km) |
| Zagarolo to Oranienburg | 754.81 mi (1,214.75 km) |
| Zagarolo to Ortenberg | 615.83 mi (991.08 km) |
