Marías is a barrio in the municipality of Aguada, Puerto Rico.

[3][4][5] Marías was in Spain's gazetteers[6] until Puerto Rico was ceded by Spain in the aftermath of the Spanish–American War under the terms of the Treaty of Paris of 1898 and became an unincorporated territory of the United States.

In 1899, the United States Department of War conducted a census of Puerto Rico finding that the population of Marías barrio was 746.

Barrios (which are, in contemporary times, roughly comparable to minor civil divisions)[14] in turn are further subdivided into smaller local populated place areas/units called sectores ("sectors" in English).

During the 2019-2020 Puerto Rico earthquakes the Lydia Meléndez School in Asomante barrio served as a refuge for residents of Cerro Gordo, Marías and Atalaya (nearby barrios), who had to leave their damaged homes.