| Zagarolo to Oberkirch | 517.25 mi (832.44 km) |
| Zagarolo to Obernburg am Main | 580.86 mi (934.81 km) |
| Zagarolo to Obernkirchen | 741.52 mi (1,193.36 km) |
| Zagarolo to Oberschleissheim | 447.62 mi (720.38 km) |
| Zagarolo to Oberstdorf | 405.19 mi (652.09 km) |
| Zagarolo to Obertraubling | 493.86 mi (794.79 km) |
| Zagarolo to Obertshausen | 600.22 mi (965.96 km) |
| Zagarolo to Oberursel | 613.05 mi (986.60 km) |
| Zagarolo to Ochsenfurt | 556.21 mi (895.13 km) |
| Zagarolo to Ochsenhausen | 453.48 mi (729.80 km) |
| Zagarolo to Ochtrup | 763.78 mi (1,229.18 km) |
| Zagarolo to Odenthal | 690.97 mi (1,112.01 km) |
| Zagarolo to Oelde | 725.14 mi (1,167.00 km) |
| Zagarolo to Oelsnitz | 593.91 mi (955.80 km) |
| Zagarolo to Oer-Erkenschwick | 726.92 mi (1,169.87 km) |
