Clearlake is a city located in Lake County, California. Clearlake is located 4.5 miles (7.2 km) north-northwest of Lower Lake, at an elevation of 1417 feet (432 m). As of the 2010 census, the city had a total population of 15,250, up from 13,142 at the 2000 census.
Clearlake is located at 38°57'30" North, 122°37'35" West.
According to the United States Census Bureau, the city has a total area of 10.6 square miles (27.4 km²), of which, 10.1 square miles (26.2 km²) of it is land and 0.5 square miles (1.2 km²) of it is water. The total area is 4.27% water.