San Clemente, CA has a population of 65,082 and is the 574th largest city in the United States. The population density is 3,546 per sq mi which is 1426% higher than the California average and 3813% higher than the national average. The median age in San Clemente is 42 which is approximately 18% higher than the California average of 36. In San Clemente, 63% of the population over 15 years of age are married, 82% speak English and 13% speak Spanish. 58% of San Clemente residents were born in California, 29% were born out of state, 1% were born outside of the United States and 12% were foreign born.