Alcalde is a census-designated place in Rio Arriba County, New Mexico, United States. In 2022, the Census Bureau lists the population at 235. Each year on December 27, the city of Alcalde celebrates a feast day. One prominent focus of the celebration is when villagers enact Los Comanches, a poetic drama written 1780. The performance, based o…Alcalde is a census-designated place in Rio Arriba County, New Mexico, United States. In 2022, the Census Bureau lists the population at 235. Each year on December 27, the city of Alcalde celebrates a feast day. One prominent focus of the celebration is when villagers enact Los Comanches, a poetic drama written 1780. The performance, based on true events, depicts the Spanish army's defeat of Comanche leader, Green Horn.