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) is a census-designated place (CDP) in Lake County, California, USA. Lower Lake is located east-southeast of Kelseyville, at an elevation of 1371 feet (418 m). The population was 1,755 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 7.9 square miles (20.5 km²), of which, 7.9 square miles (20.4 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.88%) is water.