From an administrative point of view, the Polish part of Cieszyn Silesia lies within the Silesian Voivodeship and comprises Cieszyn County, the western part of Bielsko County, and the western part of the town of Bielsko-Biała.
The Czech part lies within the Moravian-Silesian Region and comprises the Karviná District, the eastern part of the Frýdek-Místek District, and the eastern parts of the Ostrava-City District and of the city of Ostrava itself.