Middletown (formerly, Middle Station and Middleton) is a census-designated place (CDP) in Lake County, California, United States. Middletown is located 11 miles (18 km) west of Lower Lake, at an elevation of 1099 feet (335 m). The population was 1,020 at the 2000 census. Middletown was given its name because it is halfway between Lower Lake to the north and Calistoga to the south.
According to the United States Census Bureau, the CDP has a total area of 2.6 ;[square miles (6.7 km²), all of it land.
As of the census of 2000, there were 1,020 people, 392 households, and 263 families residing in the CDP. The population density was 395.6 people per square mile (152.6/km²). There were 427 housing units at an average density of 165.6/sq mi (63.9/km²). The racial makeup of the CDP was 83.73% White, 0.39% African American, 1.86% Native American, 1.67% Asian, 0.69% Pacific Islander, 8.24% from other races, and 3.43% from two or more races. Hispanic or Latino of any race were 22.84% of the population.
There were 392 households out of which 32.9% had children under the age of 18 living with them, 47.4% were married couples living together, 12.0% had a female householder with no husband present, and 32.7% were non-families. 24.0% of all households were made up of individuals and 10.2% had someone living alone who was 65 years of age or older. The average household size was 2.56 and the average family size was 3.05.
In the CDP the population was spread out with 26.6% under the age of 18, 7.5% from 18 to 24, 26.9% from 25 to 44, 23.9% from 45 to 64, and 15.2% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 110.3 males. For every 100 females age 18 and over, there were 105.2 males.
The median income for a household in the CDP was $35,278, and the median income for a family was $38,571. Males had a median income of $33,214 versus $26,515 for females. The per capita income for the CDP was $14,135. About 21.2% of families and 20.9% of the population were below the poverty line, including 22.1% of those under age 18 and 28.3% of those age 65 or over.
In the state legislature Middletown is located in the 2nd Senate District, represented by Democrat Pat Wiggins, and in the 1st Assembly District, represented by Democrat Patty Berg. Federally, Middletown is located in California's 1st congressional district, which has a Cook PVI of D +10 and is represented by Democrat Mike Thompson.
Lake County has five districts. Middletown is a subset of District 1. As of January 2009, Jim Comstock is the supervisor of District 1.