Deer Park, CA has a population of 1,092 and is the 14,592nd largest city in the United States. The population density is 196 per sq mi which is 16% lower than the California average and 116% higher than the national average. The median age in Deer Park is 62 which is approximately 73% higher than the California average of 36. In Deer Park, 78% of the population over 15 years of age are married, 91% speak English and 5% speak Spanish. 44% of Deer Park residents were born in California, 38% were born out of state, 0% were born outside of the United States and 18% were foreign born.