Palmarejo is a rural barrio with an urban zone in the municipality of Corozal, Puerto Rico.

[3][4][5] Palmarejo 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 Palmarejo barrio was 901.

[13] A bridge listed on the National Register of Historic Places in Puerto Rico is between Palmarejo barrio and Abras barrio, also in Corozal.

[14] Barrios (which are, in contemporary times, roughly comparable to minor civil divisions)[15] in turn are further subdivided into smaller local populated place areas/units called sectores (sectors in English).