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Learn about the definition, history, and rankings of metropolitan statistical areas (MSAs) in the United States, which are geographical regions with high population density and economic ties. See a map and a table of the 387 MSAs as of July 2023, with population estimates and changes.
A choropleth map is a type of thematic map that uses color to show how a variable varies across a geographic area. Learn about the history, structure, and issues of choropleth maps, and see examples of different types and applications.
Learn about the definition and classification of metropolitan and micropolitan statistical areas in the U.S. and Puerto Rico, based on population thresholds and commuting ties. See maps and tables of the number and distribution of these areas by state and territory.
A micropolitan statistical area is a labor market and statistical area in the United States with a population of at least 10,000 but fewer than 50,000 people. Learn about the definition, history, list, and map of the 542 micropolitan areas in the US and Puerto Rico.
A census tract is a geographic region defined for the purpose of taking a census. Learn how census tracts are created and used in different countries, such as the United States, Canada, France, Ireland, New Zealand and the United Kingdom.
A combined statistical area (CSA) is a group of adjacent metropolitan and micropolitan areas with economic or social linkage in the United States. Learn about the definition, criteria, list, and map of the 181 CSAs across the country and Puerto Rico.
A megacity is a very large city with over 10 million people, often with high population density and diverse functions. Learn about the number, location, and features of megacities around the world from different sources and compare them with other terms such as conurbation and metropolis.
Mean center: The mean is an important measure of central tendency, which when extended to a set of points, located on a Cartesian coordinate system, the average location, centroid or mean center, can be determined. The weighted mean center is analogous to frequencies in the calculation of grouped statistics, such as the weighted mean.