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The table below shows the mean centers of population of the United States from the first Census of Population in 1790 to 2010. For ease of use in computer systems, the latitude and longitude positions are given in decimal degree equivalents rather than traditional degrees/minutes/seconds.
To convert from decimal degrees to degrees/minutes/seconds, use the procedure in following example:
|Census Year||North Latitude||West Latitude||Approximate Location|
|2010||37.517534||92.173096||Texas County, MO, 2.7 miles northeast of Plato|
|2000||37.69699||91.80957||Phelps County, MO, 2.8 miles east of Edgar Springs|
|1990||37.87222||91.21528||Crawford County, MO, 9.7 miles southeast of Steelville|
|1980||38.13694||90.57389||Jefferson County, MO, 1/4 mile west of DeSoto||1970||38.46306||89.70611||St. Clair County, IL, 5 miles east-southeast of Mascoutah|
|1960||38.59944||89.20972||Clinton County, IL, 6 1/2 miles northwest of Centralia|
|1950||38.80417||88.36889||Clay County, IL, 3 miles northeast of Louisville|
|Coterminous United States1|
|1950||38.83917||88.15917||Richland County, IL, 8 miles north-northwest of Olney|
|1940||38.94833||87.37639||Sullivan County, IN, 2 mile southeast by east of Carlisle||1930||39.06250||87.13500||Greene County, IN, 3 miles northeast of Linton|
|1920||39.17250||86.72083||Owen County, IN, 8 miles south-southeast of Spencer|
|1910||39.17000||86.53889||Monroe County, IN, in the city of Bloomington|
|1900||39.16000||85.81500||Bartholomew County, IN, 6 miles southeast of Columbus|
|1890||39.19889||85.54806||Decatur County, IL, 20 miles east of Columbus|
|1880||39.06889||84.66111||Boone County, KY, 8 mile west by south of Cincinnati, OH||1870||39.20000||83.59500||Highland County, OH, 48 miles east by north of Cincinnati|
|1860||39.00667||82.81333||Pike County, OH, 20 miles south by east of Chillicothe|
|1850||38.98333||81.31667||Wirt County, WV, 23 miles southeast of Parkersburg2|
|1840||39.03333||80.30000||Upshur County, WV, 16 miles south of Clarksburg.
Upshur County was formed from parts of Barbour, Lewis, and Randolph Counties in 18512.
|1830||38.96500||79.28167||Grant County, WV, 19 miles west-southwest of Morefiled.
Grant County was formed from part of Hardy County in 18662.
|1820||39.09500||78.55000||Hardy County, WV, 16 mile east of Moorefield2||1810||39.19167||77.62000||Loudoun County, VA, 40 miles northwest by west of Washington, DC|
|1800||39.26833||76.94167||Howard County, MD, 18 miles west of Baltimore.
Howard County was formed from part of Anne Arundel County in 1851.
|1790||39.27500||76.18667||Kent County, MD, 23 miles east of Baltimore|
1Coterminous United States excludes Alaska and Hawaii
2West Virginia was set off from Virginia, December 31, 1862, and admitted as a state June 19, 1863.