Morro Bay, CA has a population of 10,519 and is the 3,796th largest city in the United States. The population density is 1,984 per sq mi which is 754% higher than the California average and 2089% higher than the national average. The median age in Morro Bay is 50 which is approximately 39% higher than the California average of 36. In Morro Bay, 57% of the population over 15 years of age are married, 85% speak English and 10% speak Spanish. 63% of Morro Bay residents were born in California, 25% were born out of state, 1% were born outside of the United States and 11% were foreign born.