In the United States a Metropolitan Statistical Area (MSA) is a geographical region with a relatively high population density at its core and close economic ties throughout the area. Such regions are not legally incorporated as a city or town would be, nor are they legal administrative divisions like counties or sovereign entities like states. As such the precise definition of any given metropolitan area can vary with the source. A typical metropolitan area is centered around a single large city that wields substantial influence over the region (e.g., Chicago). However, some metropolitan areas contain more than one large city with no single municipality holding a substantially dominant position (e.g., Dallas–Fort Worth metroplex or Minneapolis–Saint Paul).
MSAs are defined by the U.S. Office of Management and Budget (OMB), and used by the U.S. Census Bureau and other federal government agencies for statistical purposes.
Read more about Metropolitan Statistical Area: Definitions, Most Populous U.S. Metropolitan Areas
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