Piracaia is a municipality in the state of São Paulo in Brazil. The population is 27,462 (2020 est.) in an area of 386 km². The elevation is 792 m. The municipality was established in 1859 as Santo Antônio da Cachoeira, and its name was changed to Piracaia on 20 August 1906.

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In telecommunications, the city was served by Companhia Telefônica Brasileira until 1973, when Telecomunicações de São Paulo took over.