Core-based statistical area
[1] On July 15, 2015, the OMB released new standards based on the 2010 census.[2][3][4] These standards are used to replace the definitions of metropolitan areas from the 2010 United States census data.Micropolitan areas are based on Census Bureau-defined urban clusters of at least 10,000 and fewer than 50,000 people.Any combination of metro and micro areas may be used to form a CSA.Previously, these were referred to by the Census Bureau as New England county metropolitan areas (NECMA) and were separate from the normal census counts for the areas, based on cities and towns.