| Douglas to Oerlinghausen | 727.13 mi (1,170.20 km) |
| Douglas to Oestrich-Winkel | 725.63 mi (1,167.78 km) |
| Douglas to Offenburg | 759.81 mi (1,222.80 km) |
| Douglas to Oftersheim | 763.98 mi (1,229.51 km) |
| Douglas to Ohrdruf | 827.89 mi (1,332.36 km) |
| Douglas to Ohringen | 806.78 mi (1,298.39 km) |
| Douglas to Olbernhau | 941.17 mi (1,514.67 km) |
| Douglas to Olching | 909.40 mi (1,463.54 km) |
| Douglas to Oldenburg | 703.97 mi (1,132.94 km) |
| Douglas to Oldenburg in Holstein | 816.22 mi (1,313.58 km) |
| Douglas to Olfen | 674.73 mi (1,085.87 km) |
| Douglas to Olpe | 701.62 mi (1,129.15 km) |
| Douglas to Olsberg | 725.18 mi (1,167.07 km) |
| Douglas to Oranienburg | 913.93 mi (1,470.84 km) |
| Douglas to Ortenberg | 763.98 mi (1,229.51 km) |
