A smaller core urban area of 10,000-50,000 people with adjacent territory that has a high degree of social and economic interconnectedness with the urban core is known as a micropolitan statistical area.
A metropolitan or micropolitan statistical area often refers to a core area with a significant population nucleus and adjacent settlements that are highly integrated economically and socially with that core.
A metropolitan statistical area (MSA) is a geographic area in the United States that has strong economic links and a center with a relatively high population density. The specific definition of any particular metropolitan area might vary depending on the source because such areas are neither legally established as a city or town would be, nor are they formal administrative divisions like counties or distinct organizations like states. In 1949, the term "metropolitan area" was introduced and the statistical criteria for a conventional metropolitan region were established.
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