In the United States, a metropolitan statistical area (MSA) is a geographical region with a relatively high population density at its core and close economic ties throughout the region. Such regions are not legally incorporated as a city or town would be and are not legal administrative divisions like counties or separate entities such as states. As a result, sometimes the precise definition of a given metropolitan area will vary between sources. The statistical criteria for a standard metropolitan area were defined in 1949 and redefined as a metropolitan statistical area in 1983.
United States micropolitan statistical areas, as defined by the Office of Management and Budget (OMB), are labor market and statistical areas in the United States centered on an urban cluster with a population of at least 10,000 but fewer than 50,000 people. The micropolitan area designation was created in 2003. Like the better-known metropolitan statistical areas, a micropolitan area is a geographic entity used for statistical purposes based on counties and county equivalents. On July 21, 2023, the Office of Management and Budget released revised delineations of the various CBSAs in the United States, which recognized 542 micropolitan areas in the United States, four of which are in Puerto Rico.
Combined Statistical Area (CSA) is a United States Office of Management and Budget (OMB) term for a combination of adjacent metropolitan (MSA) and micropolitan statistical areas (µSA) across the 50 U.S. states and the territory of Puerto Rico that can demonstrate economic or social linkage. CSAs were first designated in 2003. OMB defines a CSA by various combinations of adjacent metropolitan and micropolitan areas with economic ties measured by commuting patterns. CSAs retain their own designations as metropolitan or micropolitan statistical areas in their respective larger combined statistical areas.
Pennsylvania has 14 U.S. Census Bureau-designated metropolitan statistical areas (MSAs) and four combined statistical areas (CSAs). As of 2020, Philadelphia, the seventh-largest United States metropolitan area, is the state's largest metropolitan area followed by Pittsburgh and Allentown.
The United States Commonwealth of Kentucky currently has 32 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated 8 combined statistical areas, 9 metropolitan statistical areas, and 15 micropolitan statistical areas in Kentucky.
The U.S. State of Georgia currently has 46 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated 4 combined statistical areas, 14 Georgia-based metropolitan statistical areas, and 24 micropolitan statistical areas within Georgia.
The U.S. State of Kansas currently has 23 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated three combined statistical areas, seven metropolitan statistical areas, and 13 micropolitan statistical areas in Kansas.
The United States Commonwealth of Virginia currently has 20 statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated four combined statistical areas, 12 metropolitan statistical areas, and four micropolitan statistical areas in Virginia.
The United States Commonwealth of Massachusetts currently has eight statistical areas that have been delineated by the Office of Management and Budget (OMB). On July 21, 2023, the OMB delineated two combined statistical area, seven metropolitan statistical areas, and three micropolitan statistical area in Massachusetts.
The U.S. State of Missouri currently has 31 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated six combined statistical areas, seven metropolitan statistical areas, and 18 micropolitan statistical areas in Missouri.
The U.S. state of Washington has 28 statistical areas that have been delineated by the Office of Management and Budget (OMB). On March 6, 2020, the OMB delineated six combined statistical areas, 13 metropolitan statistical areas, and nine micropolitan statistical areas in Washington. The largest of them is the Seattle metropolitan area, which had a population of 4,018,762 as of the 2020 census.
The Knoxville metropolitan area, commonly known as Greater Knoxville, is a metropolitan statistical area (MSA) centered on Knoxville, Tennessee, the third largest city in Tennessee and the largest city in East Tennessee. It is the third largest metropolitan area in Tennessee. In 2020, the Knoxville metro area had a population of 879,773, and a population of 903,300 including Grainger County. The Knoxville–Morristown–Sevierville Combined Statistical Area (CSA) had a population of 1,156,861 according to the census bureau in 2020.
The Chattanooga, TN-GA metropolitan statistical area, as defined by the United States Office of Management and Budget, is an area consisting of six counties – three in southeast Tennessee and three in northwest Georgia – anchored by the city of Chattanooga. As of the 2020 census, the Chattanooga metropolitan area had a population of 562,647. This metropolitan area traverses two time zones.
The Columbus metropolitan area, officially the Columbus metropolitan statistical area, and colloquially known as the Chattahoochee Valley, is a metropolitan statistical area consisting of six counties in the U.S. state of Georgia and one county in Alabama, anchored by the city of Columbus.
The San Juan metropolitan area is a United States Census Bureau defined metropolitan statistical area (MSA) in northeastern Puerto Rico centered around the city of San Juan. A July 1, 2009, Census Bureau estimate placed the population at 2,617,089, a 4.31% increase over the 2000 census figure of 2,509,007.
The Savannah metropolitan area, officially named the Savannah metropolitan statistical area by the U.S. Office of Management and Budget, is a metropolitan statistical area in the U.S. state of Georgia. It is centered on the city of Savannah and encompasses three counties: Bryan, Chatham, and Effingham.
The Macon metropolitan area is a metropolitan statistical area consisting of five counties in Central Georgia, anchored by the principal city of Macon. At the 2010 U.S. census, the five-county area had a population of 232,293. A July 2017 estimate placed the population at 228,914. In 2022, its estimated population was 235,805.
