Population classification, introduced by the U.S. Office of Management and Budget (OMB) in 2000, consisting of the county or counties associated with at least one core of 10,000 or greater population, plus adjacent counties having a high degree of social and economic integration with the core(s) as measured by commuting ties.
Example: Core-based statistical areas are classified as Micropolitan Statistical Areas if their population is 10,000-49,999 and Metropolitan Statistical Areas if its 50,000 or more. The largest city in each metropolitan or micropolitan statistical area is designated a "principal city." Additional cities qualify if specified requirements are met concerning population size and employment.
Core Based Statistical Area
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A Core Based Statistical Area is the official term for a functional region based around an urban center of at least 10,000 people, based on standards published by the Office of Management and Budget (OMB) in 2000. Areas defined on the basis of these standards applied with Census 2000 data were announced by OMB in June 2003. These standards are used to replace the definitions of metropolitan areas that were defined in 1990.
The term "CBSA" refers to both metropolitan statistical areas and newly-created micropolitan areas collectively. Micro areas are based around Census Bureau-defined urban cluster of at least 10,000 and fewer than 50,000 people. The map located on the right shows the metropolitan areas (in red) and micropolitan areas (in blue) for the CBSAs for the United States and Puerto Rico (which is included in the US Census data).
The basic definition of metropolitan areas has had slight changes made to it as well. A metro area, as it did in 1990, requires a Census Bureau-defined urbanized area of at least 50,000 people. A metropolitan statistical area containing an urbanized area of at least 2.5 million people can be subdivided into two or more "metropolitan divisions," provided specified criteria are met. Metropolitan divisions are conceptually similar the primary metropolitan statistical areas (PMSAs) defined under previous standards.
By a similar token, there are now definitions for "Combined Statistical Areas" (CSA). These areas can be formed when adjoining CBSAs meet particular standards to become new areas. It does not matter which kind of areas they are; any combination of metro and micro areas may be used to form a CSA.
Unlike past years, the traditional listings of metro areas list New England regions as county-based areas. In the past, these were referred to by the Census as "NECMA"'s (New England County Metropolitan Areas) and were separate from the normal census counts for the areas, which used cities and towns as their basis. They have essentially swapped places now, with the city and town areas (or NECTAs for New England City and Town Areas) being the separate listings.
Despite there not being much change in the basic definition, 49 new metropolitan areas were formed as a result of the new rules for them. Over 550 other areas were classified as micropolitan. All told, the present rules have defined 935 CBSAs in the U.S. and Puerto Rico. 11 of the CBSAs have metropolitan divisions, 29 in total. In comparison, the definition of metropolitan areas in 1999, the last year areas were formed based on the 1990 rules for them, there were 284 metropolitan areas, with 19 of the areas providing 76 primary metropolitan areas (the equivalent of divisions); almost three times the number of areas overall are now recognized by the OMB.
See also
- Geography
- United States
- United States Census Bureau
- United States Office of Management and Budget
External links
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Mentioned in
- Micropolitan Statistical Area
- Metropolitan Statistical Area (MSA)
- CBSA
- Wyoming census statistical areas
- Arizona census statistical areas
- Hawaii census statistical areas
- United States urban area
- Alaska census statistical areas
- Montana census statistical areas
- Delaware census statistical areas
- Nevada census statistical areas
- Maine census statistical areas
- Vermont census statistical areas
- District of Columbia census statistical areas
