* Not necessarily equivalent to the Census definition of the metropolitan area. ** This is the metropolitan area of Detroit within US borders. A larger metropolitan area containing the Windsor, Ontario area is used internationally. *** The Bay Area is a much larger area than the OMB's rather limited MSA, corresponding more closely to the San Jose - San Francisco - Oakland Combined Statistical Area
The general concept of a metropolitan or micropolitan statisticalarea is that of a core area containing a substantial population nucleus, together with adjacent communities having a high degree of economic and social integration with that core.
The term "metropolitanarea" (MA) was adopted in 1990 and referred collectively to metropolitanstatisticalareas (MSAs), consolidatedmetropolitanstatisticalareas (CMSAs), and primary metropolitanstatisticalareas (PMSAs).
The title of each metropolitan or micropolitan statisticalarea consists of the names of up to three of its principal cities and the name of each state into which the metropolitan or micropolitan statisticalarea extends.
MetropolitanStatisticalAreas (MSAs) reflect the efforts of the U.S. Office of Management and Budget (OMB) to map some popular images (such as New York as a metropolis, or “Greater Philadelphia”;) using urban census data.
The designation requires an urbanized county with a central city of at least 50,000, and surrounding municipalities that are socially and economically integrated with the center.
The sprawling Chicago urbanized area is populous enough to characterize a ConsolidatedMetropolitanStatisticalArea (CMSA).