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

the point at which an imaginary, flat, weightless, and rigid map of the United States would balance perfectly if weights of identical value were placed on it so that each weight represented the location of one person on the date of the census.[1]

During the 20th century the mean center of population has shifted 324 miles (521 km) west and 101 miles (163 km) south. The southerly movement was much stronger during the second half of the century; 79 miles (127 km) of the 101 miles (163 km) happened between 1950 and 2000.

The following map shows the shifting of the mean center of U.S. population since 1790:[2]

Mean center of population for the United States, 1790–2000 (U.S. Census Bureau)

The following lists location information of the mean center of U.S. population since 1790:

US Census County Location description [3] decimal Coordinates [3]
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 Morefiled. 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, OH. 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 [4]
The center of the U.S. population, 13th census.

Notes on the table data

  1. In the first census (1790) the mean population center was near Chestertown, Maryland.[4]
  2. The mean population centers between 1820 and 1860 are now in West Virginia, since Virginia (West Virginia split from Virginia in 1862).[4]
  3. Computation method used until 1950
  4. Current computation method
  5. The addition of Alaska and Hawaii to the union moved the center about two miles (3 km) farther south and about ten miles (16 km) farther west in 1960 [3].

See also

References

  1. ^ Geographic population centerfrom the U.S. Census Bureau website
  2. ^ Mean Center of Population for the United States: 1790 to 2000 from the U.S. Census Bureau website
  3. ^ a b c Centers of population computation, a U.S. Census Bureau publication, issued April 2001
  4. ^ a b c 2000 U.S. Population Centered in Phelps County, Mo., a U.S. Census Bureau press release







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