What is signal hill zip code?

The zip code for Signal Hill, California is 90755. It is located in Los Angeles County and covers an area of approximately 2.2 square miles. The population of Signal Hill is around 11,000 and the median household income is $71,000. The area is known for its oil refineries and as being the site of one of the earliest oil strikes in California in 1921. Signal Hill is a small city that is surrounded by the much larger city of Long Beach. It is named Signal Hill because it was historically used as a signaling point for ships entering the Long Beach Harbor.