| Kilkis to Oberkirch | 890.91 mi (1,433.79 km) |
| Kilkis to Obernburg am Main | 901.65 mi (1,451.07 km) |
| Kilkis to Obernkirchen | 1,013.06 mi (1,630.37 km) |
| Kilkis to Oberschleissheim | 747.55 mi (1,203.07 km) |
| Kilkis to Oberstdorf | 763.96 mi (1,229.47 km) |
| Kilkis to Obertraubling | 758.64 mi (1,220.92 km) |
| Kilkis to Obertshausen | 922.06 mi (1,483.91 km) |
| Kilkis to Oberursel | 936.81 mi (1,507.65 km) |
| Kilkis to Ochsenfurt | 861.11 mi (1,385.82 km) |
| Kilkis to Ochsenhausen | 801.22 mi (1,289.45 km) |
| Kilkis to Ochtrup | 1,070.34 mi (1,722.55 km) |
| Kilkis to Odenthal | 1,022.45 mi (1,645.47 km) |
| Kilkis to Oelde | 1,022.64 mi (1,645.78 km) |
| Kilkis to Oelsnitz | 829.78 mi (1,335.39 km) |
| Kilkis to Oer-Erkenschwick | 1,043.60 mi (1,679.51 km) |
