| Romanshorn to Isny im Allgau | 33.02 mi (53.14 km) |
| Romanshorn to Isselburg | 321.96 mi (518.15 km) |
| Romanshorn to Issum | 304.45 mi (489.97 km) |
| Romanshorn to Itzehoe | 439.59 mi (707.46 km) |
| Romanshorn to Jena | 253.21 mi (407.50 km) |
| Romanshorn to Jever | 420.17 mi (676.20 km) |
| Romanshorn to Jork | 412.80 mi (664.33 km) |
| Romanshorn to Juchen | 276.11 mi (444.35 km) |
| Romanshorn to Julich | 268.54 mi (432.17 km) |
| Romanshorn to Juterbog | 347.99 mi (560.03 km) |
| Romanshorn to Kaarst | 280.83 mi (451.95 km) |
| Romanshorn to Kaiserslautern | 148.91 mi (239.64 km) |
| Romanshorn to Kalkar | 319.32 mi (513.90 km) |
| Romanshorn to Kall | 242.28 mi (389.91 km) |
| Romanshorn to Kaltenkirchen | 434.44 mi (699.17 km) |
