| Troisdorf to Isny im Allgau | 251.97 mi (405.50 km) |
| Troisdorf to Isselburg | 76.30 mi (122.80 km) |
| Troisdorf to Issum | 59.15 mi (95.20 km) |
| Troisdorf to Itzehoe | 236.74 mi (380.99 km) |
| Troisdorf to Jena | 193.30 mi (311.09 km) |
| Troisdorf to Jever | 193.17 mi (310.88 km) |
| Troisdorf to Jork | 216.14 mi (347.85 km) |
| Troisdorf to Juchen | 34.61 mi (55.69 km) |
| Troisdorf to Julich | 35.53 mi (57.18 km) |
| Troisdorf to Juterbog | 267.61 mi (430.67 km) |
| Troisdorf to Kaarst | 36.26 mi (58.35 km) |
| Troisdorf to Kaiserslautern | 98.57 mi (158.63 km) |
| Troisdorf to Kalkar | 73.87 mi (118.88 km) |
| Troisdorf to Kall | 32.29 mi (51.96 km) |
| Troisdorf to Kaltenkirchen | 240.10 mi (386.40 km) |
