Full Size Original
Standard Metropolitan Area Map
Standard definitions of metropolitan areas were first issued in 1949 by the then Bureau of the Budget (predecessor of Office of Management and Budget or OMB), under the designation "standard metropolitan area" (SMA). The term was changed to "standard metropolitan statistical area" (SMSA) in 1959, and to "metropolitan statistical area" (MSA) in 1983. The term "metropolitan area" (MA) was adopted in 1990 and referred collectively to metropolitan statistical areas, consolidated metropolitan statistical areas, and primary metropolitan statistical areas.