Pereira Barreto is a municipality in the state of São Paulo in Brazil. The population is 25,677 (2020 est.) in an area of 974 km². The elevation is 347 meters.

The municipality was created by state law in 1938.

Historical population of municipality Year Population %± 1940 10,753 — 1946 21,351 98.6% 1950 27,749 30.0% 1958 29,334 5.7% 1960 33,543 14.3% 1970 52,413 56.3% 1980 46,366 −11.5% 1991 49,932 7.7% 2000 25,028 −49.9% 2010 24,962 −0.3% 2022 24,095 −3.5%

In telecommunications, the city was served by Companhia de Telecomunicações do Estado de São Paulo until 1975, when it began to be served by Telecomunicações de São Paulo. In July 1998, this company was acquired by Telefónica, which adopted the Vivo brand in 2012.

The company is currently an operator of cell phones, fixed lines, internet (fiber optics/4G) and television (satellite and cable).