Buena Park, CA has a population of 82,771 and is the 414th largest city in the United States. The population density is 7,868 per sq mi which is 3286% higher than the California average and 8585% higher than the national average. The median age in Buena Park is 36 which is approximately equal to the California average of 36. In Buena Park, 55% of the population over 15 years of age are married, 45% speak English and 29% speak Spanish. 51% of Buena Park residents were born in California, 10% were born out of state, 1% were born outside of the United States and 37% were foreign born.