Del Mar, CA has a population of 4,312 and is the 7,101st largest city in the United States. The population density is 2,526 per sq mi which is 987% higher than the California average and 2689% higher than the national average. The median age in Del Mar is 51 which is approximately 41% higher than the California average of 36. In Del Mar, 57% of the population over 15 years of age are married, 91% speak English and 3% speak Spanish. 29% of Del Mar residents were born in California, 42% were born out of state, 5% were born outside of the United States and 24% were foreign born.