Before revision: Metropolitan areas in the United States are delineated around the Core of a core based statistical area which is defined as an urban area, (this is different than the urban core) and consists of central and outlying counties, as the terms central city and suburb are no longer used by the census bureau due to suburbanization of employment.
After revision: Metropolitan areas in the United States are delineated around the core of a core based statistical area which is defined as an urban area, (this is different than the urban core) and consists of central and outlying counties, as the terms central city and suburb are no longer used by the census bureau due to suburbanization of employment.