Bloomington is a unincorporated census-designated place (CDP) in San Bernardino County, California, United States. The population was 19,318 at the 2000 census. Though unincorporated at the current time, many of the town's political activists are pushing for Bloomington to attain cityhood, while the nearby cities of Rialto and Fontana are attempting to annex the community. The incorporation effort is led by the BIC, or the Bloomington Incorporation Committee.