San Juan Capistrano, CA has a population of 36,006 and is the 1,170th largest city in the United States. The population density is 2,495 per sq mi which is 974% higher than the California average and 2654% higher than the national average. The median age in San Juan Capistrano is 42 which is approximately 17% higher than the California average of 36. In San Juan Capistrano, 62% of the population over 15 years of age are married, 64% speak English and 33% speak Spanish. 55% of San Juan Capistrano residents were born in California, 21% were born out of state, 1% were born outside of the United States and 23% were foreign born.