Ostrów Mazowiecka County (Polish: powiat ostrowski) 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 Ostrów Mazowiecka, which lies 89 kilometres (55 mi) north-east of Warsaw. The only other town in the county is Brok, lying 12 km (7 mi) south of Ostrów Mazowiecka. The county covers an area of 1,218.06 square kilometres (470.3 sq mi). As of 2006 its total population is 75,073, out of which the population of Ostrów Mazowiecka is 22,560, that of Brok is 1,859, and the rural population is 50,654.