Foreign and domestic tourists using the accommodation base and granted accommodation in tourist accommodation facilities with 10 or more beds.

Under the new NUTS 2016 classification valid since 1 January 2018, introduced by the Regulation of the EU Commission, Mazowieckie voivodship was divided into two statistical regions – Warsaw capital and mazowiecki regional. This regulation is the result of the revision of the Classification of Territorial Units for Statistics (NUTS), under which modifications were made to the statistical units of 9 EU Member States.