| Nagykallo to Oberkirch | 634.62 mi (1,021.32 km) |
| Nagykallo to Obernburg am Main | 592.49 mi (953.52 km) |
| Nagykallo to Obernkirchen | 639.44 mi (1,029.07 km) |
| Nagykallo to Oberschleissheim | 475.13 mi (764.64 km) |
| Nagykallo to Oberstdorf | 539.09 mi (867.58 km) |
| Nagykallo to Obertraubling | 449.91 mi (724.06 km) |
| Nagykallo to Obertshausen | 608.43 mi (979.18 km) |
| Nagykallo to Oberursel | 621.20 mi (999.73 km) |
| Nagykallo to Ochsenfurt | 549.71 mi (884.67 km) |
| Nagykallo to Ochsenhausen | 550.10 mi (885.30 km) |
| Nagykallo to Ochtrup | 714.06 mi (1,149.17 km) |
| Nagykallo to Odenthal | 695.15 mi (1,118.74 km) |
| Nagykallo to Oelde | 667.14 mi (1,073.65 km) |
| Nagykallo to Oelsnitz | 470.88 mi (757.81 km) |
| Nagykallo to Oer-Erkenschwick | 699.91 mi (1,126.40 km) |
