| Olgiate Olona to Oerlinghausen | 437.71 mi (704.42 km) |
| Olgiate Olona to Oestrich-Winkel | 304.47 mi (490.00 km) |
| Olgiate Olona to Offenburg | 200.81 mi (323.17 km) |
| Olgiate Olona to Oftersheim | 258.60 mi (416.17 km) |
| Olgiate Olona to Ohrdruf | 368.85 mi (593.61 km) |
| Olgiate Olona to Ohringen | 248.11 mi (399.30 km) |
| Olgiate Olona to Olbernhau | 403.59 mi (649.52 km) |
| Olgiate Olona to Olching | 211.25 mi (339.98 km) |
| Olgiate Olona to Oldenburg | 519.80 mi (836.53 km) |
| Olgiate Olona to Oldenburg in Holstein | 605.31 mi (974.15 km) |
| Olgiate Olona to Olfen | 425.83 mi (685.31 km) |
| Olgiate Olona to Olpe | 375.06 mi (603.60 km) |
| Olgiate Olona to Olsberg | 395.41 mi (636.35 km) |
| Olgiate Olona to Oranienburg | 529.59 mi (852.29 km) |
| Olgiate Olona to Ortenberg | 326.39 mi (525.27 km) |
