| Hardenberg to Oststeinbek | 162.12 mi (260.91 km) |
| Hardenberg to Ottendorf-Okrilla | 321.98 mi (518.17 km) |
| Hardenberg to Ottersberg | 111.97 mi (180.20 km) |
| Hardenberg to Ottobrunn | 382.30 mi (615.26 km) |
| Hardenberg to Ottweiler | 222.39 mi (357.90 km) |
| Hardenberg to Overath | 115.46 mi (185.82 km) |
| Hardenberg to Oyten | 105.92 mi (170.47 km) |
| Hardenberg to Paderborn | 107.94 mi (173.71 km) |
| Hardenberg to Papenburg | 47.57 mi (76.56 km) |
| Hardenberg to Parchim | 224.71 mi (361.63 km) |
| Hardenberg to Pasewalk | 313.32 mi (504.24 km) |
| Hardenberg to Passau | 407.59 mi (655.96 km) |
| Hardenberg to Pattensen | 134.34 mi (216.20 km) |
| Hardenberg to Pegnitz | 288.51 mi (464.31 km) |
| Hardenberg to Peine | 153.26 mi (246.65 km) |
