| Naples to Oerlinghausen | 813.34 mi (1,308.94 km) |
| Naples to Oestrich-Winkel | 701.55 mi (1,129.04 km) |
| Naples to Offenburg | 611.53 mi (984.16 km) |
| Naples to Oftersheim | 650.91 mi (1,047.54 km) |
| Naples to Ohrdruf | 710.81 mi (1,143.94 km) |
| Naples to Ohringen | 622.58 mi (1,001.94 km) |
| Naples to Olbernhau | 680.84 mi (1,095.71 km) |
| Naples to Olching | 529.00 mi (851.34 km) |
| Naples to Oldenburg | 896.10 mi (1,442.13 km) |
| Naples to Oldenburg in Holstein | 943.32 mi (1,518.13 km) |
| Naples to Olfen | 819.48 mi (1,318.82 km) |
| Naples to Olpe | 767.50 mi (1,235.18 km) |
| Naples to Olsberg | 776.79 mi (1,250.13 km) |
| Naples to Oranienburg | 825.04 mi (1,327.77 km) |
| Naples to Ortenberg | 703.80 mi (1,132.66 km) |
