| Cities | Distance |
|---|---|
| Kocaeli to Devnya | 208.13 mi (334.96 km) |
| Kocaeli to Dimitrovgrad | 240.74 mi (387.44 km) |
| Kocaeli to Dobrich | 221.19 mi (355.97 km) |
| Kocaeli to Dospat | 305.10 mi (491.01 km) |
| Kocaeli to Dupnitsa | 366.64 mi (590.05 km) |
| Kocaeli to Elhovo | 198.75 mi (319.87 km) |
| Kocaeli to Etropole | 336.61 mi (541.72 km) |
| Kocaeli to Gabrovo | 277.18 mi (446.08 km) |
| Kocaeli to Gorna Oryahovitsa | 271.61 mi (437.11 km) |
| Kocaeli to Gotse Delchev | 326.36 mi (525.22 km) |
| Kocaeli to Harmanli | 223.51 mi (359.70 km) |
| Kocaeli to Haskovo | 239.70 mi (385.76 km) |
| Kocaeli to Ihtiman | 335.70 mi (540.26 km) |
| Kocaeli to Isperih | 257.94 mi (415.11 km) |
| Kocaeli to Kardzhali | 244.34 mi (393.23 km) |