Clearlake is a city in Lake County, California. Clearlake is 4.5 miles (7.2 km) north-northwest of Lower Lake, at an elevation of 1,417 feet (432 m). As of the 2020 census, the city had a total population of 16,685, up from 15,250 in 2010. It takes its name from Clear Lake.

Lake County is a county located in the north central portion of the U.S. state of California. As of the 2020 census, the population was 68,163. The county seat is Lakeport. The county takes its name from Clear Lake, the dominant geographic feature in the county and the largest non-extinct natural lake wholly within California.