Cayucos, CA has a population of 2,987 and is the 8,841st largest city in the United States. The population density is 964 per sq mi which is 315% higher than the California average and 964% higher than the national average. The median age in Cayucos is 56 which is approximately 56% higher than the California average of 36. In Cayucos, 59% of the population over 15 years of age are married, 91% speak English and 5% speak Spanish. 61% of Cayucos residents were born in California, 32% were born out of state, 0% were born outside of the United States and 8% were foreign born.