The United States federal government defines and delineates the nation's metropolitan areas for statistical purposes, using a set of standard statistical area definitions. As of 2013, the U.S. Office of Management and Budget (OMB) defined and delineated 388 metropolitan statistical areas (MSAs) and 541 micropolitan statistical areas (μSAs) in the United States and Puerto Rico. Many of these 929 MSAs and μSAs are, in turn, components of larger combined statistical areas (CSAs) consisting of adjacent MSAs and μSAs that are linked by commuting ties; as of 2013, 524 metropolitan and micropolitan areas are components of the 169 defined CSAs.
Metropolitan and micropolitan statistical areas are defined as consisting of one or more adjacent counties or county equivalents with at least one urban core area meeting relevant population thresholds, plus adjacent territory that has a high degree of social and economic integration with the core, as measured by commuting ties. A metropolitan statistical area has at least one urban core with a population of at least 50,000. In a micropolitan statistical area, the largest urban core has a population of at least 10,000 but less than 50,000.
Types and distribution 
The sortable table below shows the number of metropolitan and micropolitan statistical areas in each of the U.S. states, the District of Columbia, and Puerto Rico. For each jurisdiction, it lists:
- Total number of delineated areas wholly or partially in the named jurisdiction
- The number of primary statistical areas (i.e., CSAs plus any MSAs and µSAs that are not included in a CSA) wholly or partially in the jurisdiction
- The number of CSAs wholly or partially in the jurisdiction
- The number of core-based statistical areas (i.e., MSAs and µSAs) wholly or partially in the jurisdiction
- The number of MSAs wholly or partially in the jurisdiction
- The number of µSAs wholly or partially in the jurisdiction
- The number of counties and county-equivalents in the jurisdiction
Please note: Because many metropolitan and micropolitan areas overlap jurisdictional boundaries, columns are not additive.
See also 
- ^ a b c d e f g "OMB Bulletin No. 13-01: Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas". United States Office of Management and Budget. February 28, 2013. Retrieved April 2, 2013.
- ^ "Annual Estimates of the Resident Population for Counties and County-Equivalents: April 1, 2010 to July 1, 2012" (CSV). 2012 Population Estimates. United States Census Bureau, Population Division. April 2012. Retrieved March 18, 2013.
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap This state shares one or more statistical areas with one or more other states.
- ^ The State of Alaska has 16 boroughs, 2 independent municipalities, and 11 census areas.
- ^ The State of Louisiana has 64 parishes.
- ^ The State of Maryland has 23 counties and 1 independent city.
- ^ The State of Maryland has 114 counties, and the 1 independent city.
- ^ The State of Nevada has 16 counties and 1 independent city.
- ^ The Commonwealth of Virginia has 95 counties and 39 independent cities.
- ^ The District of Columbia shares both its statistical areas with nearby states.
- ^ The District of Columbia has no counties or other subdivisions, but the District itself is considered a county-equivalent.
- ^ The United States of America has 3087 counties, parishes, and boroughs; 11 census areas; 44 independent cities and municipalities; and 1 federal district.
- ^ The Commonwealth of Puerto Rico has 78 municipios.
- ^ The United States and Puerto Rico have 3087 counties, parishes, and boroughs; 78 municipios; 11 census areas; 44 independent cities and municipalities; and 1 federal district.
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