| Hatvan to Oerlinghausen | 572.54 mi (921.42 km) |
| Hatvan to Oestrich-Winkel | 553.99 mi (891.55 km) |
| Hatvan to Offenburg | 544.15 mi (875.73 km) |
| Hatvan to Oftersheim | 520.24 mi (837.25 km) |
| Hatvan to Ohrdruf | 457.98 mi (737.05 km) |
| Hatvan to Ohringen | 477.67 mi (768.73 km) |
| Hatvan to Olbernhau | 353.17 mi (568.37 km) |
| Hatvan to Olching | 388.22 mi (624.78 km) |
| Hatvan to Oldenburg | 629.35 mi (1,012.84 km) |
| Hatvan to Oldenburg in Holstein | 595.77 mi (958.80 km) |
| Hatvan to Olfen | 615.22 mi (990.10 km) |
| Hatvan to Olpe | 580.05 mi (933.50 km) |
| Hatvan to Olsberg | 561.86 mi (904.22 km) |
| Hatvan to Oranienburg | 451.75 mi (727.01 km) |
| Hatvan to Ortenberg | 515.06 mi (828.91 km) |
