Rio de Contas is a municipality in the Bahia state, in the eastern part of Brazil. Its estimated population as of 2020 was 12,932. Rio de Contas has its origins in the 18th century. In 1718 the town of Santo Antônio de Mato Grosso was founded. It was later elevated to the status of municipality in 1773, with the designation of Vila Nova de Nossa Senhora do Livramento das Minas do Rio de Contas. Its named was shortened in 1840 to Minas do Rio de Contas, and in 1931 to Rio de Contas.