Sereno del Mar, CA has a population of 61 and is the 27,899th largest city in the United States. The population density is 83 per sq mi which is 64% lower than the California average and 9% lower than the national average. The median age in Sereno del Mar is 72 which is approximately 101% higher than the California average of 36. In Sereno del Mar, 56% of the population over 15 years of age are married, 85% speak English and 0% speak Spanish. 43% of Sereno del Mar residents were born in California, 43% were born out of state, 15% were born outside of the United States and 0% were foreign born.