What does it mean when an area in the US is a

* MSA - Metropolitan Statistical Area: These areas are defined by the U.S. Office of Management and Budget and are based on core urban areas with a population of at least 50,000. MSAs are used for statistical purposes and are often used to define economic regions.

* CSA - Combined Statistical Area: These areas are made up of two or more adjacent MSAs that have economic and social ties. CSAs are also used for statistical purposes and can be used to define larger economic regions.

* PMSA - Primary Metropolitan Statistical Area: These areas are defined as urbanized areas that have a population of at least 250,000. PMSAs are used to define the metropolitan areas that are most important to the United States economy.

* CMSA - Consolidated Metropolitan Statistical Area: These areas are made up of two or more adjacent PMSAs that have economic and social ties. CMSAs are also used to define larger economic regions.

* NECMA - New England City and Town Area: These areas are defined by the U.S. Census Bureau and are used for statistical purposes. NECMAs are based on clusters of cities and towns that are economically and socially connected.