Geography

National Centers of Population 1790-2010

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:

Say you wish to convert the 1990 latitude from 37.87222 to its degrees/minutes/seconds equivalent. First, set the degrees to be the part of the number left of the decimal, e.g., degrees = 37. Then remove the degrees from the decimal value and you are left with the minutes/seconds part. Multiply this remainder by 60 to get the minutes value, e.g., 0.87222 times 60 = 52.3332. Set the minutes to be the part of the number left of the decimal, e.g., minutes = 52. Then, taking the decimal value multiply it by 60 to get the seconds, e.g., 0.3332 * 60 = 19.99. Generally, this is rounded to the nearest whole number; in this case, 20. This is the seconds part.

Census Year North Latitude West Latitude Approximate Location
United States
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.

Source: U.S. Census Bureau | Geography | (301) 763-1128 |  Last Revised: January 24, 2013