Districts
| Rank | City | 1990 Census | 2000 Census | 2007 Census | 2009 Estimate |
| 1 | İzmit | 159.116 | 195.669 | 248.424 | 313.964 |
| 2 | Gebze | 190.741 | 253.487 | 310.815 | 297.956 |
| 3 | Derince | 66.141 | 93.997 | 113.991 | 116.806 |
| 4 | Darıca | 53.559 | 85.818 | 109.580 | 112.975 |
| 5 | Körfez | 63.194 | 81.938 | 97.535 | 99.859 |
| 6 | Gölcük | 65.600 | 55.790 | 71.538 | 73.788 |
| 7 | Çayırova District, Kocaeli | 7.800 | 24.825 | 36.741 | 38.709 |
| 8 | Karamürsel | 24.462 | 29.353 | 36.466 | 37.172 |
| 9 | Dilovası | 18.590 | 28.890 | 35.856 | 36.851 |
| 10 | Değirmendere | 19.530 | 22.086 | 29.906 | 31.023 |
| 11 | Alikahya | 4.074 | 16.300 | 23.192 | 24.182 |
| 12 | Hereke | 13.872 | 14.553 | 18.877 | 19.495 |
| 13 | Yuvacık | 7.338 | 12.101 | 18.491 | 19.404 |
| 14 | Köseköy | 9.200 | 15.639 | 17.492 | 17.757 |
| 15 | Kandıra | 10.427 | 12.641 | 15.473 | 15.770 |
| 16 | Uzunçiftlik | 7.261 | 13.302 | 14.893 | 15.342 |
| 17 | Kullar | 8.820 | 17.105 | 13.730 | 13.248 |
| 18 | İhsaniye | 9.186 | 15.000 | 12.839 | 13.054 |
| 19 | Bahçecik | 8.648 | 9.563 | 12.232 | 12.613 |
| 20 | Kuruçeşme | 7.743 | 9.490 | 11.785 | 12.113 |
| 21 | Arslanbey | 3.439 | 4.421 | 10.573 | 11.452 |
Read more about this topic: Kocaeli Province
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