| Harsum to Oestrich-Winkel | 174.48 mi (280.81 km) |
| Harsum to Offenburg | 273.32 mi (439.86 km) |
| Harsum to Oftersheim | 204.86 mi (329.69 km) |
| Harsum to Ohrdruf | 100.79 mi (162.21 km) |
| Harsum to Ohringen | 208.63 mi (335.75 km) |
| Harsum to Olbernhau | 180.01 mi (289.69 km) |
| Harsum to Olching | 283.16 mi (455.70 km) |
| Harsum to Oldenburg | 97.75 mi (157.31 km) |
| Harsum to Oldenburg in Holstein | 149.67 mi (240.87 km) |
| Harsum to Olfen | 114.77 mi (184.71 km) |
| Harsum to Olpe | 122.76 mi (197.56 km) |
| Harsum to Olsberg | 86.47 mi (139.17 km) |
| Harsum to Oranienburg | 143.00 mi (230.14 km) |
| Harsum to Ortenberg | 133.64 mi (215.07 km) |
| Harsum to Oschatz | 148.41 mi (238.85 km) |
