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.
Novo Airão
New Airão began when the Jesuits founded a settlement at the mouth of the Jaú River in 1668 named Santo Elias de Jau. The region was inhabited by Indians Waimiri-Atroari, Crichanã, Carabinari and Jauaperi. Everything indicates that the mission village of Santo Elias de Jau was the second or third nucleus of settlement organized by the Portuguese in Amazonian lands. In 1759, the village was elevated to a town with the name Airão by Joaquim de Melo Póvoas, first governor of the . Later, the district around Airão became part of Manaus and when it was dismembered in 1938, became New Airão.