| Kilkis to Oerlinghausen | 1,012.49 mi (1,629.45 km) |
| Kilkis to Oestrich-Winkel | 949.08 mi (1,527.39 km) |
| Kilkis to Offenburg | 894.56 mi (1,439.65 km) |
| Kilkis to Oftersheim | 902.74 mi (1,452.82 km) |
| Kilkis to Ohrdruf | 893.78 mi (1,438.39 km) |
| Kilkis to Ohringen | 862.27 mi (1,387.69 km) |
| Kilkis to Olbernhau | 809.93 mi (1,303.45 km) |
| Kilkis to Olching | 754.57 mi (1,214.36 km) |
| Kilkis to Oldenburg | 1,082.67 mi (1,742.40 km) |
| Kilkis to Oldenburg in Holstein | 1,072.70 mi (1,726.34 km) |
| Kilkis to Olfen | 1,042.43 mi (1,677.63 km) |
| Kilkis to Olpe | 997.02 mi (1,604.55 km) |
| Kilkis to Olsberg | 989.92 mi (1,593.13 km) |
| Kilkis to Oranienburg | 930.00 mi (1,496.69 km) |
| Kilkis to Ortenberg | 926.72 mi (1,491.42 km) |
