Merced is a city in, and the county seat of, Merced County, California, United States, in the San Joaquin Valley. As of the 2020 census, the city had a population of 86,333, up from 78,958 in 2010. Incorporated on April 1, 1889, Merced is a charter city that operates under a council–manager government. It is named after the Merced River, which flows nearby.