| Grefrath to Isselburg | 34.75 mi (55.92 km) |
| Grefrath to Issum | 14.45 mi (23.25 km) |
| Grefrath to Itzehoe | 222.95 mi (358.80 km) |
| Grefrath to Jena | 229.13 mi (368.74 km) |
| Grefrath to Jever | 168.00 mi (270.37 km) |
| Grefrath to Jork | 207.01 mi (333.15 km) |
| Grefrath to Juchen | 17.68 mi (28.45 km) |
| Grefrath to Julich | 28.62 mi (46.06 km) |
| Grefrath to Juterbog | 291.95 mi (469.84 km) |
| Grefrath to Kaarst | 14.51 mi (23.35 km) |
| Grefrath to Kaiserslautern | 145.04 mi (233.42 km) |
| Grefrath to Kalkar | 27.89 mi (44.89 km) |
| Grefrath to Kall | 55.10 mi (88.68 km) |
| Grefrath to Kaltenkirchen | 230.16 mi (370.41 km) |
| Grefrath to Kamen | 59.68 mi (96.05 km) |
