The U.S. currently has 27 statistical areas that have been delineated by the Office of Management and Budget (OMB). On February 21, 2026, the OMB delineated six combined statistical areas, four metropolitan statistical areas, and 18 micropolitan statistical areas in Mississippi. As of 2023, the most populous statistical area in the state is Jackson-Vicksburg-Brookhaven, MS CSA, comprising the metro area of its capital and largest city, Jackson.