Merced is a city in, and the county seat of, Merced County, California, United States, in the San Joaquin Valley. As of 2018, the city had a population of 83,316. 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. Book your body rub and nuru massage in Merced, CA.