Mean center of the United States population

Map showing changes to the mean center of population for the United States, 1790–2010 (US Census Bureau)[1]
The center of the US population, 13th census, near Bloomington, Indiana
The center of the US population, 13th census (1910), near Bloomington, Indiana

The mean center of the United States population is determined by the United States Census Bureau from the results of each census. The Bureau defines it to be:

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 on one person. More specifically, this calculation is called the mean center of population.[2]

After moving roughly 600 mi (966 km) west by south during the 19th century, during the 20th century the shift in the mean center of population was less pronounced, moving 324 mi (521 km) west and 101 mi (163 km) south. The southerly movement was much stronger during the second half of the 20th century; 79% of the southerly movement happened between 1950 and 2000.

Location info since 1790

US Census County Location description[2] Decimal coordinates[2]
1790 Kent County, Maryland 1.) 23 miles east of Baltimore. 39°16′30″N 76°11′12″W / 39.27500°N 76.18667°W / 39.27500; -76.18667
1800 Howard County, Maryland 18 miles west of Baltimore. 39°16′06″N 76°56′30″W / 39.26833°N 76.94167°W / 39.26833; -76.94167
1810 Loudoun County, Virginia 40 miles northwest by west of Washington, DC. 39°11′30″N 77°37′12″W / 39.19167°N 77.62000°W / 39.19167; -77.62000
1820 Hardy County, Virginia (now W. Virginia) 2.) 16 miles east of Moorefield. 39°05′42″N 78°33′00″W / 39.09500°N 78.55000°W / 39.09500; -78.55000
1830 Grant County, Virginia (now W. Virginia) 2.) 19 miles west-southwest of Moorefield. 38°57′54″N 79°16′54″W / 38.96500°N 79.28167°W / 38.96500; -79.28167
1840 Upshur County, Virginia (now W. Virginia) 2.) 16 miles south of Clarksburg. 39°02′00″N 80°18′00″W / 39.03333°N 80.30000°W / 39.03333; -80.30000
1850 Wirt County, Virginia (now W. Virginia) 2.) 23 miles southeast of Parkersburg. 38°59′00″N 81°19′00″W / 38.98333°N 81.31667°W / 38.98333; -81.31667
1860 Pike County, Ohio 20 miles south by east of Chillcothe. 39°00′24″N 82°48′48″W / 39.00667°N 82.81333°W / 39.00667; -82.81333
1870 Highland County, Ohio 48 miles east by north of Cincinnati. 39°12′00″N 83°35′42″W / 39.20000°N 83.59500°W / 39.20000; -83.59500
1880 Boone County, Kentucky 8 miles west by south of Cincinnati. 39°04′08″N 84°39′40″W / 39.06889°N 84.66111°W / 39.06889; -84.66111
1890 Decatur County, Indiana 20 miles east of Columbus. 39°11′56″N 85°32′53″W / 39.19889°N 85.54806°W / 39.19889; -85.54806
1900 Bartholomew County, Indiana 6 miles southeast of Columbus. 39°09′36″N 85°48′54″W / 39.16000°N 85.81500°W / 39.16000; -85.81500
1910 Monroe County, Indiana in the city of Bloomington. 39°10′12″N 86°32′20″W / 39.17000°N 86.53889°W / 39.17000; -86.53889
1920 Owen County, Indiana 8 miles south-southeast of Spencer. 39°10′21″N 86°43′15″W / 39.17250°N 86.72083°W / 39.17250; -86.72083
1930 Greene County, Indiana 3 miles northeast of Linton. 39°03′45″N 87°08′06″W / 39.06250°N 87.13500°W / 39.06250; -87.13500
1940 Sullivan County, Indiana 2 miles southeast by east of Carlisle. 38°56′54″N 87°22′35″W / 38.94833°N 87.37639°W / 38.94833; -87.37639
1950 Richland County, Illinois 3.) 8 miles north-northwest of Olney. 3.) 38°50′21″N 88°09′33″W / 38.83917°N 88.15917°W / 38.83917; -88.15917 3.)
1950 Clay County, Illinois 4.) 3 miles northeast of Louisville. 4.) 38°48′15″N 88°22′08″W / 38.80417°N 88.36889°W / 38.80417; -88.36889 4.)
1960 Clinton County, Illinois 5.) 6-1/2 miles northwest of Centralia. 5.) 38°35′58″N 89°12′35″W / 38.59944°N 89.20972°W / 38.59944; -89.20972 5.)
1970 St. Clair County, Illinois 5 miles east-southeast of Mascoutah. 38°27′47″N 89°42′22″W / 38.46306°N 89.70611°W / 38.46306; -89.70611
1980 Jefferson County, Missouri 1/4 mile west of DeSoto. 38°08′13″N 90°34′26″W / 38.13694°N 90.57389°W / 38.13694; -90.57389
1990 Crawford County, Missouri 9.7 miles southeast of Steelville. 37°52′20″N 91°12′55″W / 37.87222°N 91.21528°W / 37.87222; -91.21528
2000 Phelps County, Missouri 2.8 miles east of Edgar Springs 37°41′49″N 91°48′34″W / 37.696987°N 91.809567°W / 37.696987; -91.809567[3]
2010 Texas County, Missouri 2.7 miles northeast of Plato. 37°31′03″N 92°10′23″W / 37.517534°N 92.173096°W / 37.517534; -92.173096[4]
2015 (estimated) Wright County, Missouri 8.0 miles southwest of Plato. 37°26′26″N 92°20′47″W / 37.440431°N 92.346373°W / 37.440431; -92.346373[5]
2020 (projected) Wright County, Missouri 8.3 miles north of Hartville. 37°22′14″N 92°30′11″W / 37.370671°N 92.503147°W / 37.370671; -92.503147[5]

The 20.8 mile shift projected for the 2010–2020 period would be the shortest centroid movement since the Great Depression intercensal period of 1930–1940.[5]

Notes on the table data

  1. In the first census (1790) the mean population center was near Chestertown, Maryland.[3]
  2. The mean population centers of 1820, 1830, 1840 and 1850 were in what is now West Virginia, given West Virginia's split from Virginia in 1863.[3]
  3. Computation method used until 1950.
  4. Current computation method.
  5. The addition of Alaska and Hawaii to the union contributed to move the center about two miles (3 km) farther south and about ten miles (16 km) farther west in 1960.[2]

See also

References

  1. ↑ Mean Center of Population for the United States: 1790 to 2010 from the U.S. Census Bureau website.
  2. 1 2 3 4 Centers of population computation, a U.S. Census Bureau publication, issued March 2011.
  3. 1 2 3 2000 U.S. Population Centered in Phelps County, Mo., a U.S. Census Bureau press release.
  4. ↑ Centers of Population for the 2010 Census, U.S. Census Bureau.
  5. 1 2 3 Alex Zakrewsky, Principal Planner/Data Manager, Middlesex County New Jersey Office of Planning.
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