Moss Beach, CA has a population of 3,706 and is the 7,791st largest city in the United States. The population density is 1,652 per sq mi which is 611% higher than the California average and 1723% higher than the national average. The median age in Moss Beach is 40 which is approximately 12% higher than the California average of 36. In Moss Beach, 72% of the population over 15 years of age are married, 69% speak English and 29% speak Spanish. 57% of Moss Beach residents were born in California, 26% were born out of state, 2% were born outside of the United States and 16% were foreign born.