Rio Rancho is the largest and most populous city in Sandoval County, New Mexico, United States. A small portion of the city extends into northern Bernalillo County. Part of the expansive Albuquerque metropolitan area, it is the third-largest city in New Mexico, and one of the most rapidly growing. Rio Rancho had a population of 104,046 at the 2020 census. The name Rio Rancho derives from Los Ranch…