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 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.
As of the census of 2000, there are 13,142 people, 5,532 households, and 3,313 families residing in the city. The population density is 1,290.9 people per square mile (498.4/km²). There are 7,605 housing units at an average density of 288.4/km² (747.0/sq mi). The racial makeup of the city is 82.35% White, 5.20% Black or African American, 2.69% Native American, 1.13% Asian, 0.16% Pacific Islander, 3.65% from other races, and 4.80% from two or more races. 11.03% of the population are Hispanic or Latino of any race.
There are 5,532 households out of which 26.4% have children under the age of 18 living with them, 38.1% are married couples living together, 15.7% have a female householder with no husband present, and 40.1% are non-families. 32.9% of all households are made up of individuals and 16.1% have someone living alone who is 65 years of age or older. The average household size is 2.35 and the average family size is 2.96.
In the city the population is spread out with 25.8% under the age of 18, 6.7% from 18 to 24, 23.1% from 25 to 44, 24.1% from 45 to 64, and 20.3% who are 65 years of age or older. The median age is 41 years. For every 100 females there are 91.9 males. For every 100 females age 18 and over, there are 87.8 males.
The median income for a household in the city is $19,863, and the median income for a family is $25,504. Males have a median income of $24,694 versus $18,207 for females. The per capita income for the city is $12,538. 28.6% of the population and 23.5% of families are below the poverty line. Out of the total population, 39.8% of those under the age of 18 and 8.4% of those 65 and older are living below the poverty line.
In the state legislature Clearlake is located in the 2nd Senate District, represented by Democrat Pat Wiggins, and in the 1st Assembly District, represented by Democrat Patty Berg. Federally, Clearlake is located in California's 1st congressional district, which has a Cook PVI of D +10 and is represented by Democrat Mike Thompson.
The Clearlake post office opened in 1923, changed its name to Clearlake Park in 1937, and changed it back in 1980 when Clearlake incorporated.