Santos Dumont is a municipality in southern Minas Gerais state, Brazil. The population is estimated to be 46,421 and the total area of the municipality is 639.1 km2. It lies at an elevation of 839 m just off the main interstate highway, BR040, between the urban centers of Barbacena and Juiz de Fora. It is 240 km from the state capital, Belo Horizonte, and 220 km from Rio de Janeiro. It became a city in 1889.