| Monterotondo to Oerlinghausen | 709.72 mi (1,142.19 km) |
| Monterotondo to Oestrich-Winkel | 591.97 mi (952.69 km) |
| Monterotondo to Offenburg | 498.21 mi (801.78 km) |
| Monterotondo to Oftersheim | 541.72 mi (871.81 km) |
| Monterotondo to Ohrdruf | 613.05 mi (986.61 km) |
| Monterotondo to Ohringen | 516.34 mi (830.97 km) |
| Monterotondo to Olbernhau | 596.33 mi (959.70 km) |
| Monterotondo to Olching | 429.61 mi (691.38 km) |
| Monterotondo to Oldenburg | 793.10 mi (1,276.37 km) |
| Monterotondo to Oldenburg in Holstein | 850.08 mi (1,368.08 km) |
| Monterotondo to Olfen | 711.70 mi (1,145.36 km) |
| Monterotondo to Olpe | 659.58 mi (1,061.49 km) |
| Monterotondo to Olsberg | 671.47 mi (1,080.63 km) |
| Monterotondo to Oranienburg | 740.16 mi (1,191.18 km) |
| Monterotondo to Ortenberg | 598.43 mi (963.08 km) |
