Presented data are preliminary and will be subject to revision due to revision policy applied in national and regional accounts. Final data for 2016 will be published in October 2018.

There are five subregional centres in Mazowieckie voivodship: Ciechanów, Ostrołęka, Płock, Radom and Siedlce. These cities, until the end of 1998, were the capitals of the voivodships, and after the administrative reform from January 1, 1999 they gained the status of cities with powiat rights. The exception is Ciechanów, which gained the status of urban gmina. Since 1999, majority of these cities recorded a population decrease mainly due to migration. One of the reasons for population decline was the suburbanisation process and the outflow of population to the suburban area.