Cajamar is a municipality in the State of São Paulo, Brazil. It is part of the Metropolitan Region of São Paulo. The population is 77,934 in an are…Cajamar is a municipality in the State of São Paulo, Brazil. It is part of the Metropolitan Region of São Paulo. The population is 77,934 in an area of 131.39 km². It is bordered by Jundiaí to the north, Franco da Rocha and Caieiras to the east, the capital of the southeast, Santana do Parnaíba and Pirapora do Bom Jesus in the west.