Mean center of the United States population information
Demographic statistic
Map showing changes to the mean center of population for the United States, 1790–2020 (US Census Bureau)[1]Map of the Position of the U.S. Geographic Center of Area, Mean Center of Population, and Median Center of Population, 2020 (U.S. Census Bureau)[2]The center of the US population, 13th census, near Bloomington, IndianaThe center of the US population, 13th census (1910), near Bloomington, Indiana
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The mean center of the United States population is determined by the United States Census Bureau from the results of each national census. The Bureau defines it as follows:
The concept of the center of population as used by the U.S. Census Bureau is that of a balance point. The center of population is the point at which an imaginary, weightless, rigid, and flat (no elevation effects) surface representation of the 50 states (or 48 conterminous states for calculations made prior to 1960) and the District of Columbia would balance if weights of identical size were placed on it so that each weight represented the location of one person. More specifically, this calculation is called the mean center of population.[3]
After moving roughly 600 mi (966 km) west by south during the 19th century, the shift in the mean center of population during the 20th century was less pronounced, moving 324 mi (521 km) west and 101 mi (163 km) south. Nearly 79% of the overall southerly movement happened between 1950 and 2000.
One occasional confusion is the misconception that the point splits the US population into two equal halves, such that half of Americans live east of the point, and the other half west of it, however, this is actually a property of the median center of US population, which is not weighted by geographic distance and lies in Gibson County, Indiana.
^"Mean Center of Population for the United States: 1790 to 2020" (PDF). Archived (PDF) from the original on November 16, 2021.
^Bureau, US Census. "Position of the Geographic Center of Area, Mean and Median Centers of Population: 2020". Census.gov. Retrieved December 28, 2021.
^Centers of population computation, a U.S. Census Bureau publication, issued November 2021.
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