Kelseyville (formerly, Kelsey, Kelsey Creek, Kelsey Town, Peartown, and Uncle Sam) is a census-designated place (CDP) in Lake County, California, United States. Kelseyville is located 6 miles (9.7 km) southeast of Lakeport, at an elevation of 1384 feet (422 m). The population was 2,928 at the 2000 census.