| Harwich to Oerlinghausen | 315.03 mi (507.00 km) |
| Harwich to Oestrich-Winkel | 321.88 mi (518.02 km) |
| Harwich to Offenburg | 379.66 mi (611.01 km) |
| Harwich to Oftersheim | 366.04 mi (589.08 km) |
| Harwich to Ohrdruf | 415.02 mi (667.91 km) |
| Harwich to Ohringen | 407.43 mi (655.69 km) |
| Harwich to Olbernhau | 527.97 mi (849.68 km) |
| Harwich to Olching | 514.38 mi (827.81 km) |
| Harwich to Oldenburg | 303.57 mi (488.55 km) |
| Harwich to Oldenburg in Holstein | 430.58 mi (692.95 km) |
| Harwich to Olfen | 261.59 mi (420.98 km) |
| Harwich to Olpe | 289.53 mi (465.96 km) |
| Harwich to Olsberg | 311.95 mi (502.03 km) |
| Harwich to Oranienburg | 507.86 mi (817.33 km) |
| Harwich to Ortenberg | 354.60 mi (570.67 km) |
