 The gmina covers an area of , and as of 2006 its total population is 21,531, of which the population of Brwinów is 11,968, and the population of the rural part of the gmina is 9,563.Apart from the town of Brwinów, Gmina Brwinów contains the villages and settlements of Biskupice, Czubin, Domaniew, Domaniewek, Falęcin, Grudów, Kanie, Kopana, Koszajec, Kotowice, Krosna-Wieś, Milęcin, Moszna-Wieś, Otrębusy, Owczarnia, Parzniew, Popówek, Terenia and Żółwin.Gmina Brwinów is bordered by the towns of Milanówek, Podkowa Leśna and Pruszków, and by the gminas of Błonie, Grodzisk Mazowiecki, Michałowice, Nadarzyn and Ożarów Mazowiecki.