Kelseyville, CA has a population of 3,822 and is the 7,650th largest city in the United States. The population density is 1,325 per sq mi which is 470% higher than the California average and 1362% higher than the national average. The median age in Kelseyville is 38 which is approximately 6% higher than the California average of 36. In Kelseyville, 59% of the population over 15 years of age are married, 69% speak English and 29% speak Spanish. 61% of Kelseyville residents were born in California, 20% were born out of state, 2% were born outside of the United States and 18% were foreign born.