The name of the region dates to the time of Marechal Cândido Rondon, who noticed a large amount of native cocao there near the bank of the Ji-Paraná River (Machado River).

He recommended that the guard Anízio Serrão build a house there, and Serrao asked for the site to be granted to him in 1912, calling it Cacoal.

In 1960, the rubber tapper and gold miner José Cassimiro Lopes built a shack on the left side of the highway, where he remained until the early 1970s.

Large sections on mud developed in the winter and drivers who were prevented from continuing their journey waited at the rubber tapper's house.

They built huts where they put the goods they carried for sale to prevent them from spoiling.

[6] In 2017, the average monthly salary of formal workers was 2.0 minimum wages.

Households with monthly income of up to half a minimum wage per person represent 35.6% of the population.