Ostrołęka County Powiat ostrołęcki
County
Location within the voivodeship
Division into gminas
Coordinates (Ostrołęka): 53°4′N 21°34′E / 53.067°N 21.567°E / 53.067; 21.567
Country	Poland
Voivodeship	Masovian
Seat	Ostrołęka
Gminas	Total 11 Gmina Baranowo Gmina Czarnia Gmina Czerwin Gmina Goworowo Gmina Kadzidło Gmina Lelis Gmina Łyse Gmina Myszyniec Gmina Olszewo-Borki Gmina Rzekuń Gmina Troszyn
Area
• Total	2,099.32 km2 (810.55 sq mi)
Population  (2019)
• Total	88,717
• Density	42/km2 (110/sq mi)
• Urban	3,408
• Rural	85,309
Car plates	WOS
Website	https://powiatostrolecki.pl/

Ostrołęka County (Polish: powiat ostrołęcki) is a unit of territorial administration and local government (powiat) in Masovian Voivodeship, east-central Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat is the city of Ostrołęka, although the city is not part of the county (it constitutes a separate city county). The only town in Ostrołęka County is Myszyniec, which lies 38 km (24 mi) north of Ostrołęka.

The county covers an area of 2,099.32 square kilometres (810.6 sq mi). As of 2019 its total population is 88,717, out of which the population of Myszyniec is 3,408 and the rural population is 85,309.^[1]

Apart from the city of Ostrołęka, Ostrołęka County is also bordered by Pisz County and Kolno County to the north, Łomża County to the east, Ostrów Mazowiecka County to the south-east, Wyszków County to the south, Maków County to the south-west, Przasnysz County to the west, and Szczytno County to the north-west.

The county is subdivided into 11 gminas (one urban-rural and 10 rural). These are listed in the following table, in descending order of population.