| Census year | North latitude | West longitude | Approximate location in United States: |
| 2010 | 37.5 | 92.2 | Texas County, MO, 2.7 miles northeast of Plato. |
| 2000 | 37.7 | 91.8 | Phelps County, MO, 2.8 miles east of Edgar Springs. |
| 1990 | 37.9 | 91.2 | Crawford County, MO, 9.7 miles southeast of Steelville. |
| 1980 | 38.1 | 90.6 | Jefferson County, MO, 1/4 mile west of DeSoto. |
| 1970 | 38.5 | 89.7 | St. Clair County, IL, 5 miles east-southeast of Mascoutah. |
| 1960 | 38.6 | 89.2 | Clinton County, IL, 6-1/2 miles northwest of Centralia. |
| 1950 | 38.8 | 88.2 | Richland County, IL, 8 miles north-northwest of Olney. |
| 1940 | 38.9 | 87.4 | Sullivan County, IN, 2 miles southeast by east of Carlisle. |
| 1930 | 39.1 | 87.1 | Greene County, IN, 3 miles northeast of Linton. |
| 1920 | 39.2 | 86.7 | Owen County, IN, 8 miles south-southeast of Spencer. |
| 1910 | 39.2 | 86.5 | Monroe County, IN, in the city of Bloomington. |
| 1900 | 39.2 | 85.8 | Bartholomew County, IN, 6 miles southeast of Columbus. |
| 1890 | 39.2 | 85.5 | Decatur County, IN, 20 miles east of Columbus. |
| 1880 | 39.1 | 84.7 | Boone County, KY, 8 miles west by south of Cincinnati, OH. |
| 1870 | 39.2 | 83.6 | Highland County, OH, 48 miles east by north of Cincinnati. |
| 1860 | 39.0 | 82.8 | Pike County, OH, 20 miles south by east of Chillicothe. |
| 1850 | 39.0 | 81.3 | Wirt County, WV, 23 miles southeast of Parkersburg. |
| 1840 | 39.0 | 80.3 | Upshur County, WV, 16 miles south of Clarksburg. Upshur County was formed from parts of Barbour, Lewis, and Randolph Counties in 1851. |
| 1830 | 39.0 | 79.3 | Grant County, WV, 19 miles west-southwest of Moorefield. Grant County was formed from part of Hardy County in 1866. |
| 1820 | 39.1 | 78.6 | Hardy County, WV, 16 miles east of Moorefield. |
| 1810 | 39.2 | 77.6 | Loudoun County, VA, 40 miles northwest by west of Washington, DC. |
| 1800 | 39.3 | 76.9 | Howard County, MD, 18 miles west of Baltimore. Howard County was formed from part of Anne Arundel County in 1851. |
| 1790 | 39.3 | 76.2 | Kent County, MD, 23 miles east of Baltimore. |
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