Carapicuíba (Portuguese pronunciation: [kɐɾɐpikuˈibɐ]) is a municipality in the state of São Paulo in Brazil. It is part of the Metropolitan Region of São Paulo. The population is 392,294 (2015 est.) in an area of 34.55 square kilometres (13.34 sq mi). It is one of the most densely populated municipalities in the state of São Paulo.