Devrek is a town and district in Zonguldak Province in the Black Sea Region of Turkey. It was originally founded as Hamidiye, in the sanjak of Bolu. Devrek was incorporated into the Zonguldak Province on May 14, 1920. It is divided into five quarters, three subdistricts and seventy-six villages. The three subdistricts are Çaydeğirmeni, Eğerci, and Özbağı. The population of the Devrek district is 66,518. The mayor is Mustafa Semerci (AKP).