California, United States·2K residents
Middletown is a census-designated place (CDP) in Lake County, California, United States. Its population was 1,114 at the 2020 census, down from 1,323 at the 2010 census, which was up from 1,020 at the 2000 census. Middletown was given its name because it is halfway between Lower Lake and Calistoga, which is 17 miles (27 km) to the south. The town was severely damaged by the 2015 Valley Fire.
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