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Signal Hill is a city 2.2 mi2 (5.7 km2) in area in Los Angeles County, California, United States. Partially high on an eponymous hill, the city is an enclave completely surrounded by the city of Long Beach. Signal Hill was incorporated on April 22, 1924, roughly three years after oil was discovered there. As of the 2020 census, the population was 11,848, up from 11,016 at the 2010 census.