| Quattro Castella to Oerlinghausen | 513.35 mi (826.17 km) |
| Quattro Castella to Oestrich-Winkel | 388.33 mi (624.96 km) |
| Quattro Castella to Offenburg | 290.89 mi (468.15 km) |
| Quattro Castella to Oftersheim | 339.09 mi (545.71 km) |
| Quattro Castella to Ohrdruf | 428.20 mi (689.12 km) |
| Quattro Castella to Ohringen | 318.80 mi (513.06 km) |
| Quattro Castella to Olbernhau | 437.61 mi (704.27 km) |
| Quattro Castella to Olching | 249.73 mi (401.91 km) |
| Quattro Castella to Oldenburg | 596.79 mi (960.43 km) |
| Quattro Castella to Oldenburg in Holstein | 668.16 mi (1,075.30 km) |
| Quattro Castella to Olfen | 509.50 mi (819.95 km) |
| Quattro Castella to Olpe | 457.58 mi (736.40 km) |
| Quattro Castella to Olsberg | 473.01 mi (761.23 km) |
| Quattro Castella to Oranienburg | 575.05 mi (925.45 km) |
| Quattro Castella to Ortenberg | 400.82 mi (645.05 km) |
