UpAlphabetical listing of Places in Kocaeli
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|
| Oluklu | city | Kocaeli | Turkey | 40.67 | 29.58 | 1145 | 38282 |
| Omerli | city | Kocaeli | Turkey | 40.92 | 30.24 | 830 | 6982 |
| Orcun | city | Kocaeli | Turkey | 40.70 | 29.80 | 830 | 56010 |
| Oren | city | Kocaeli | Turkey | 40.85 | 29.84 | 1256 | 10945 |
| Orhaniye | city | Kocaeli | Turkey | 40.86 | 30.07 | 1092 | 7069 |
| Ortaburun | city | Kocaeli | Turkey | 40.79 | 30.20 | 830 | 16336 |
| Ortaburun Koyu | city | Kocaeli | Turkey | 40.79 | 30.20 | 830 | 16336 |
| Ortaköy | city | Kocaeli | Turkey | 41.02 | 29.89 | 400 | 7003 |
| Osmaniye | city | Kocaeli | Turkey | 40.67 | 29.69 | 2509 | 55863 |
| Osmanlı | city | Kocaeli | Turkey | 40.92 | 29.78 | 830 | 7003 |
| Otuk | city | Kocaeli | Turkey | 40.97 | 30.10 | 830 | 7003 |
| Ovacik | city | Kocaeli | Turkey | 40.97 | 29.50 | 830 | 7003 |
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