Editing Metropolitan statistical area (section)

==Definitions==
[[File:CBSA WallMap Jul2023.pdf|thumb|An enlargeable map of the 935 [[core-based statistical area]]s (CBSAs) of the [[United States]] and [[Puerto Rico]] as of 2023; the 393 MSAs are shown in <span style="color:#008060;">medium green</span>.<ref name="Revision 2023" />]]
The U.S. [[Office of Management and Budget]] defines a set of [[core based statistical area]]s (CBSAs) throughout the country, which are composed of [[List of United States counties and county equivalents|counties and county equivalents]].<ref>[https://www.census.gov/geo/lv4help/cengeoglos.html Census Geographic Glossary] {{Webarchive|url=https://web.archive.org/web/20120927004858/http://www.census.gov/geo/lv4help/cengeoglos.html |date=September 27, 2012 }}, U.S. Census Bureau</ref> 

CBSAs are delineated on the basis of a central contiguous area of relatively high population density, known as an [[United States urban area|urban area]]. The counties containing the core urban area are known as the "central counties" of the CBSA; these are defined as having at least 50% of their population living in [[List of United States urban areas|urban areas]] of at least 10,000 in population.<ref name="OFR">{{cite web |title=2020 Standards for Delineating Core Based Statistical Areas |url=https://www.federalregister.gov/documents/2021/07/16/2021-15159/2020-standards-for-delineating-core-based-statistical-areas#:~:text=The%20general%20concept%20of%20a%20core%20based%20statistical,a%20high%20degree%20of%20integration%20with%20that%20nucleus. |website=Federal Register | date=July 16, 2021 |publisher=National Archives and Records Administration |access-date=6 February 2024}}</ref> Additional surrounding counties, known as "outlying counties", can be included in the CBSA if these counties have strong social and economic ties to the central county or counties as measured by [[commuting]] and employment. Outlying counties are included in the CBSA if 25% of the workers living in the county work in the central county or counties, or if 25% of the employment in the county is held by workers who live in the central county or counties.

Adjacent CBSAs are merged into a single CBSA when the central county or counties of one CBSA qualify as an outlying county or counties to the other CBSAs.<ref name="OFR"/> One or more CBSAs may be grouped together or combined to form a larger statistical entity known as a [[combined statistical area]] (CSA) when the employment interchange measure (EIM) reaches 15% or more.

CBSAs are subdivided into MSAs (formed around urban areas of at least 50,000 in population) and [[micropolitan statistical area]]s (μSAs), which are CBSAs built around an urban area of at least 10,000 in population but less than 50,000 in population. Some metropolitan areas may include multiple cities below 50,000 people, but combined have over 50,000 people.<ref name="OFR"/> Previous terms that are no longer used to describe these regions include "standard metropolitan statistical area" (SMSA) and "primary metropolitan statistical area" (PMSA).<ref>{{cite web |url=https://www.census.gov/population/www/metroareas/metroarea.html |title=Metropolitan and Micropolitan Statistical Areas |publisher=U.S. Census Bureau |access-date=February 16, 2010 |archive-date=September 23, 2011 |archive-url=https://web.archive.org/web/20110923210008/http://www.census.gov/population/www/metroareas/metroarea.html |url-status=live }}</ref>

On January 19, 2021, OMB submitted a regulation for public comment that would increase the minimum population needed for an urban area population to be a metropolitan statistical area to be increased from 50,000 to 100,000.<ref>{{Cite web|date=January 19, 2021|title=Recommendations From the Metropolitan and Micropolitan Statistical Area Standards Review Committee to the Office of Management and Budget Concerning Changes to the 2010 Standards for Delineating Metropolitan and Micropolitan Statistical Areas|url=https://www.federalregister.gov/documents/2021/01/19/2021-00988/recommendations-from-the-metropolitan-and-micropolitan-statistical-area-standards-review-committee|access-date=January 21, 2021|website=Federal Register|archive-date=January 20, 2021|archive-url=https://web.archive.org/web/20210120231126/https://www.federalregister.gov/documents/2021/01/19/2021-00988/recommendations-from-the-metropolitan-and-micropolitan-statistical-area-standards-review-committee|url-status=live}}</ref> It ultimately decided to keep the minimum at 50,000 for the 2020 cycle.<ref>{{cite press release|title=Office of Management and Budget Announces 2020 Standards for Delineating Core Based Statistical Areas|url=https://bidenwhitehouse.archives.gov/omb/briefing-room/2021/07/13/office-of-management-and-budget-announces-2020-standards-for-delineating-core-based-statistical-areas/|author=[[White House|The White House]]|date=July 13, 2021|access-date=July 17, 2021|archive-date=July 16, 2021|archive-url=https://web.archive.org/web/20210716233710/https://www.whitehouse.gov/omb/briefing-room/2021/07/13/office-of-management-and-budget-announces-2020-standards-for-delineating-core-based-statistical-areas/|url-status=live}}</ref>

On July 21, 2023, the [[Office of Management and Budget]] released revised delineations of the various CBSAs in the United States.<ref name="Revision 2023">{{cite press release|title=Revised Delineations of Metropolitan Statistical Areas, Micropolitan Statistical Areas, and Combined Statistical Areas, and Guidance on Uses of the Delineations of These Areas|url=https://bidenwhitehouse.archives.gov/wp-content/uploads/2023/07/OMB-Bulletin-23-01.pdf|author=[[Executive Office of the President of the United States|Executive Office of the President]]|date=July 21, 2023|access-date=July 21, 2023|archive-date=July 21, 2023|archive-url=https://web.archive.org/web/20230721214234/https://www.whitehouse.gov/wp-content/uploads/2023/07/OMB-Bulletin-23-01.pdf|url-status=live}}</ref>