Clearlake Oaks, CA has a population of 1,841 and is the 11,502nd largest city in the United States. The population density is 931 per sq mi which is 300% higher than the California average and 927% higher than the national average. The median age in Clearlake Oaks is 57 which is approximately 58% higher than the California average of 36. In Clearlake Oaks, 55% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 58% of Clearlake Oaks residents were born in California, 38% were born out of state, 1% were born outside of the United States and 4% were foreign born.