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is a city located in Lake County, California. Clearlake is located north-northwest of Lower Lake, at an elevation of 1417 feet (432 m). As of the 2000 census, the city had a total population of 13,142.
According to the United States Census Bureau, the city has a total area of 10.6 square miles (27.5 km²), of which, 10.2 square miles (26.4 km²) of it is land and 0.4 square miles (1.1 km²) of it is water. The total area is 4.05% water.