Guanajibo is a barrio in the municipality of Hormigueros, Puerto Rico.

[3][4][5] Guanajibo 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 Guanajibo and Pueblo barrios was 1,203.

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] The following sectors are in Guanajibo barrio:[17] Calle La Ceiba, Camino Cachito, Camino Fian Toro, Camino Justo Colón, Camino Los Barbosa, Carretera 343 (until km 2.3), Égida Presbiteriana del Ángel, Hogar Eterno Paraíso de Amor, Hogar San José, Parcelas San Romualdo, Reparto Santa Ana, Sector Higinia Vázquez, Sector Hoya Grande, Sector Las Plumas, Sector Los Quiles, Sector Los Santana (both sides), Sector Punto Cubano, Urbanización Buenaventura, Urbanización Paseo Loma Linda, Urbanización Monte Bello, Urbanización Valle Hermoso, and Urbanización Villa Zoraida.