San Luis Río Colorado
Place
San Luis Río Colorado is a city and also the name of its surrounding municipality in the state of Sonora, Mexico. In the 2020 census, the city had a population of 176,685. The city is the fourth-largest community in the state, and the municipality is also the fourth-largest in terms of population. Lying in the northwestern corner of Sonora, the city marks the state border with Baja California.