[3][4][5] Barrero 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 combined population of Barrero and Atalaya barrios was 1,157.

[7] Barrios (which are, in contemporary times, roughly comparable to minor civil divisions)[13] in turn are further subdivided into smaller local populated place areas/units called sectores (sectors in English).

[14][15][16][17][18] The following sectors are in Barrero barrio:[19] Carretera 115, Carretera 429, Condominio Sol y Playa, Punta Cadena, Sector La Mancha, Sector La Playa, and The Villas at the Horned Dorset Primavera.

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