Merced, CA has a population of 81,461 and is the 423rd largest city in the United States. The population density is 3,507 per sq mi which is 1409% higher than the California average and 3771% higher than the national average. The median age in Merced is 29 which is approximately 18% lower than the California average of 36. In Merced, 46% of the population over 15 years of age are married, 55% speak English and 34% speak Spanish. 65% of Merced residents were born in California, 12% were born out of state, 1% were born outside of the United States and 21% were foreign born.