The Warsaw West County is a county in Masovian Voivodeship, located in east-central Poland, with its seat of government located in Ożarów Mazowiecki. Other towns located in the county are: Łomianki, and Błonie. It was established on January 1, 1999, as a result of the Polish local government reforms. Until 31 December 2005, its seat was located extraterritorially in the city of Warsaw.