Ostrów County () is a county in Masovian Voivodeship, east-central Poland. Its seat is located in the town of Ostrów Mazowiecka, with the other towns of the county being Małkinia Górna and Brok. The county was established on 1 January 1999, and historically existed from 1919 to 1939 in the Białystok Voivodeship, Second Polish Republic, and in 1939, in the Warsaw Voivodeship.
The county covers an area of . As of 2019, its total population is 72,558, out of which the population of Ostrów Mazowiecka is 22,489, that of Małkinia Górna is 4,834 and Brok 1,941, and the rural population is 48,128.
Neighbouring counties Ostrów County is bordered by Łomża County to the north, Zambrów County to the north-east, Wysokie Mazowieckie County to the east, Sokołów County and Węgrów County to the south, Wyszków County to the south-west, and Ostrołęka County to the north-west.
Administrative divisions The county is subdivided into 11 gminas (one urban, two urban-rural and eight rural). These are listed in the following table, in descending order of population.
Gmina Type Area(km2) Population(2019) SeatOstrów Mazowieckaurban22.122,489 Gmina Ostrów Mazowieckarural283.712,885Ostrów Mazowiecka *Gmina Małkinia Górnaurban-rural134.111,617Małkinia GórnaGmina Wąseworural119.24,317WąsewoGmina Andrzejeworural118.64,094AndrzejewoGmina Stary Lubotyńrural109.23,724Stary LubotyńGmina Zaręby Kościelnerural88.93,660Zaręby KościelneGmina Brokurban-rural110.22,840BrokGmina Nurrural102.92,670NurGmina Boguty-Piankirural89.12,594Boguty-PiankiGmina Szulborze Wielkierural46.71,668Szulborze Wielkie* seat not part of the gmina
References