Santa Cruz, CA has a population of 63,310 and is the 594th largest city in the United States. The population density is 4,969 per sq mi which is 2038% higher than the California average and 5385% higher than the national average. The median age in Santa Cruz is 29 which is approximately 20% lower than the California average of 36. In Santa Cruz, 31% of the population over 15 years of age are married, 75% speak English and 14% speak Spanish. 63% of Santa Cruz residents were born in California, 22% were born out of state, 1% were born outside of the United States and 14% were foreign born.