Bellflower, city, Los Angeles County, southern California; founded 1906, incorporated 1957. Bellflower is a residential community with dairy, truck farm, and commercial flower industries. The site was formerly rich farmland watered by artesian wells and floodwaters of the now-contained San Gabriel River. The city is named for the bellflower apples once grown here. Population 53,441 (1980); 61,815 (1990); 72,878 (2000).