Santa Clarita, CA has a population of 180,303 and is the 137th largest city in the United States. The population density is 2,737 per sq mi which is 1078% higher than the California average and 2921% higher than the national average. The median age in Santa Clarita is 38 which is approximately 5% higher than the California average of 36. In Santa Clarita, 56% of the population over 15 years of age are married, 69% speak English and 21% speak Spanish. 59% of Santa Clarita residents were born in California, 19% were born out of state, 1% were born outside of the United States and 21% were foreign born.