Bellflower is a city located in southeast Los Angeles County, California, in the Los Angeles metropolitan area. It was founded in 1906 and incorporated on September 3, 1957. As of the 2020 census, the city had a total population of 79,190, up from 76,616 at the 2010 census. This made it the 65th most densely populated city in the United States, of cities over 50,000 residents.

The Gateway Cities Region, or Southeast Los Angeles County, is an urbanized region located in southeastern Los Angeles County, California, between the City of Los Angeles proper, Orange County, and the Pacific Ocean. The cluster of cities has been termed "Gateway Cities" in that they serve as a "gateway" between the LA and Orange counties, with the city of Cerritos equidistant from Downtown L.A., Long Beach, and Santa Ana in Orange County. As such, the area is central to the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area (MSA), and has a population of approximately 2,000,000 residents.