Węgrów County 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 and largest town is Węgrów, which lies 73 km east of Warsaw. The only other town in the county is Łochów, lying 26 km north-west of Węgrów. The county covers an area of 1219.18 km2. As of 2019 its total population is 66,037, out of which the population of Węgrów is 12,628, that of Łochów is 6,825, and the rural population is 46,584.

Neighbouring counties

Węgrów County is bordered by Ostrów Mazowiecka County to the north, Sokołów County to the east, Siedlce County to the south, Mińsk County to the south-west, and Wołomin County and Wyszków County to the west.

Administrative division

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