Águas de São Pedro
Recognizing the importance of the thermal springs in the region, the São Paulo State Government on 19 June 1940 founded the (Hydromineral and Climatic Spa of Águas de São Pedro). Despite this, the city celebrates its birthday on 25 July, the date in 1940 of the founding of the first major building in the city, the "Grande Hotel" (now "Grande Hotel São Pedro"). The municipality of Águas de São Pedro was incorporated by State Law No.233, of 24 December 1948.
São Pedro da Aldeia
São Pedro da Aldeia was founded in 1660 by Catholic priests on the top of a hill named after Saint Peter, in honor of whom the city was named. A chapel was built that was later replaced by an architecturally significant church. Nowadays it is the main historical monument in the town and is protected by state laws. Some colonial buildings and landmarks remain today, such as the cemetery beside the church, where the family graves of the founders of the town remain. In the 1960s the Brazilian Air Force and Navy built a military airport there, bringing many migrants from others parts of the country and increasing the town's population.