Rio Lucio is a census-designated place in Taos County, New Mexico, United States. The population was 379 at the 2000 census. Accordin…Rio Lucio is a census-designated place in Taos County, New Mexico, United States. The population was 379 at the 2000 census. According to the United States Census Bureau, the CDP has a total area of 1.1 square miles, all land.