From the Wikipedia page [https://en.wikipedia.org/wiki/Tren%C4%8D%C3%ADn_Region
The Trenčín Region (Slovak: Trenčiansky kraj; Czech: Trenčínský kraj) is one of the eight Slovak administrative regions. It consists of 9 districts (okresy). The region was established in 1996, previously it had been a part of West-Slovak region (Západoslovenský kraj) and partly central Slovak region (Stredoslovenský kraj). Industry is a main branch of region economy.
The Trenčín Region consists of 9 districts: Bánovce nad Bebravou, Ilava, Myjava, Nové Mesto nad Váhom, Partizánske, Považská Bystrica, Prievidza, Púchov, and Trenčín.
There are 274 municipalities (obce), including 18 towns.