Alcalde is a census-designated place (CDP) in Rio Arriba County, New Mexico, United States. The population was 377 at the 2000 census. "Alcalde" literally means "Mayor" in Spanish. According to the United States Census Bureau, the CDP has a total area of 0.5 square miles (1.3 km2), all of it land. The Oñate Monument Center is located in Alcalde on NM Highway 68.
As of the census of 2000, there were 377 people, 121 households, and 99 families residing in the CDP. The population density was 735.3 people per square mile (285.4/km²). There were 138 housing units at an average density of 269.2 per square mile (104.5/km²). The racial makeup of the CDP was 37.40% White, 0.27% African American, 1.59% Native American, 0.27% Asian, 54.64% from other races@