Signal Hill is a city (2.2 mi², 5.7 km²) in California located in the Greater Los Angeles area. Signal Hill, completely surrounded by the city of Long Beach, was incorporated on April 22, 1924, roughly three years after oil was discovered there. As of the 2010 census, the city population was 11,465.
Signal Hill lies in the 562 area code. The city once shared three different postal ZIP codes with the city of Long Beach but in July 2002, the city of Signal Hill received its own ZIP code, 90755.