Alumínio (Portuguese meaning aluminium) is a Brazilian municipality of the state of São Paulo. It is part of the Metropolitan Region of Sorocaba. The population is 18,767 (2020 est.) in an area of 83.66 km. The elevation is 790 m. Alumínio is located east of Sorocaba and is also a suburban area. The main employer in Alumínio is Companhia Brasileira de Aluminio.

The history of the city starts with the Rodovalho Railway, named after Col. Antônio Proost Rodovalho, owner of a factory in Alumínio. His factory existed until 1920. Alumínio was part of São Roque city until Mairinque was emancipated as an independent city and yet, Alumínio was just a borough of Mairinque. In 1991, Alumínio was emancipated and became a city.

• Mairinque
• Sorocaba
• Votorantim
• Ibiúna

Historical population

Year	Pop.	±%
2001	15,252	—
2005	16,018	+5.0%
2015	18,061	+12.8%

According to the 2000 IBGE Census, the population was 15,252, of which 13,727 are urban and 1,525 are rural. The average life expectancy was 69.03 years. The literacy rate was at 92.89%.

In telecommunications, the city was 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).

• List of municipalities in the state of São Paulo by population
• Interior of São Paulo

• (in Portuguese) https://web.archive.org/web/20070929001931/http://www.guiasaoroque.com.br/aluminio/aluminio.htm
• (in Portuguese) http://www.aluminio.sp.gov.br
• (in Portuguese) Alumínio on citybrazil.com.br