Aztec is a city in San Juan County, New Mexico, United States. It is part of the Farmington, New Mexico Metropolitan Statistical Area. The population was 6,378 at the 2000 census. It is the county seat of San Juan County. The Aztec Ruins National Monument stands close to the city. Aztec apartments for rent comparison page shows most up to date rent information on Aztec apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.