| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Ucgaziler | city | Kocaeli Ili | Turkey | 40.8488889 | 29.9611111 | 1066 | 31759 |
| Ulasli | city | Kocaeli Ili | Turkey | 40.7033333 | 29.6947222 | 620 | 24357 |
| Ulaşlı | city | Kocaeli Ili | Turkey | 40.7033333 | 29.6947222 | 620 | 24357 |
| Ulupinar | city | Kocaeli Ili | Turkey | 40.95 | 29.95 | 967 | 31717 |
| Ulupınar | city | Kocaeli Ili | Turkey | 40.95 | 29.95 | 967 | 31717 |
| Ummiye | city | Kocaeli Ili | Turkey | 40.6666667 | 29.85 | 639 | 28225 |
| Umniye | city | Kocaeli Ili | Turkey | 40.6666667 | 29.85 | 639 | 28225 |
| Utok | city | Kocaeli Ili | Turkey | 40.9666667 | 30.1 | 531 | 31697 |
| Utuk | city | Kocaeli Ili | Turkey | 40.9666667 | 30.1 | 531 | 31697 |
| Utök | city | Kocaeli Ili | Turkey | 40.9666667 | 30.1 | 531 | 31697 |
| Uzunbey | city | Kocaeli Ili | Turkey | 40.7666667 | 30.0666667 | 55 | 31801 |
| Uzundere | city | Kocaeli Ili | Turkey | 40.6666667 | 29.7 | 2273 | 24357 |
| Uzuntarla | city | Kocaeli Ili | Turkey | 40.7333333 | 30.15 | 311 | 31739 |
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