Acosta is the twelfth canton in the province of San José in Costa Rica.

[3][1] The mountainous canton begins in the Cerros de Escazú on the far western edge of the San José Metropolitan Area.

It continues west and south between the Negro River on the north and the Jorco River on the east to encompass a large portion of the Coastal Mountain Range, ending at the border of Puntarenas Province near the Pacific coast in Parrita Canton.

According to Costa Rica's Municipal Code, mayors are elected every four years by the population of the canton.

[4] As of the latest municipal elections in 2024, the National Liberation Party candidate, Nelson Martín Umaña Quirós, was elected mayor of the canton with 41.92% of the votes, with Tania Granados Borbón and Marianela Arias Elizondo as first and second vice mayors, respectively.