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Demography is the statistical study of human populations: their size, composition, and how they change through birth, death, and migration. Learn about the history, methods, and applications of demography from ancient times to the present.
A metropolitan statistical area (MSA) is a geographical region with a relatively high population density and close economic ties in the United States. Learn about the definitions, history, rankings and examples of MSAs and their components.
Learn about the definitions and types of metropolitan and micropolitan statistical areas in the U.S. and Puerto Rico, as well as their number and distribution by state and territory. See maps and tables of the 935 core-based statistical areas and the 184 combined statistical areas.
An urban area is a human settlement with a high population density and an infrastructure of built environment. Learn about the historical growth, urbanization and classification of urban areas, and see the list of the 200 largest urban areas in the world by population.
A rural area is a geographic area that is located outside towns and cities, with low population density and small settlements. Different countries have varying definitions of rural for statistical and administrative purposes, and rural areas have unique economic and social dynamics due to their relationship with land-based industry.
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.
The Chicago metropolitan area, also known as Chicagoland, is a region of the United States that includes the city of Chicago and its suburbs. It covers parts of Illinois, Indiana, and Wisconsin, and has a population of over 9.8 million people.
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.