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|Year||North Latitude||West Longitude|
|18801||39° 09′ 04″||76° 41′ 17″|
|18901||39° 09′ 32″||76° 41′ 21″|
|19001||39° 09′ 36″||76° 42′ 15″|
|19101||39° 10′ 01″||76° 42′ 36″|
|19201||39° 11′ 03″||76° 43′ 40″|
|19302||39° 13′ 05″||76° 46′ 03″|
|19402||39° 13′ 03″||76° 46′ 56″|
|19503||39° 10′ 31″||76° 43′ 56″|
|19603||39° 11′ 15″||76° 46′ 22″|
|19703||39° 09′ 51″||76° 47′ 11″|
|19804||39° 09′ 35″||76° 47′ 25″|
|19905||39° 09′ 03″||76° 47′ 43″|
|20006||39° 08′ 44″||76° 47′ 51″|
|20106||39° 08′ 27″||76° 47′ 52″|
1 Source: U.S. Department of Commerce, Bureau of the Census, Fourteenth Census of the United States, 1923
2 Source: U.S. Census Bureau, recomputation for historical county level data which relied upon aggregate county level population data with an estimated county centroid resulting in a possible error of up to one mile.
3 Source: U.S. Department of Commerce, Bureau of the Census, Centers of Population for States and Counties, 1974
4 Source: U.S. Census Bureau, Geography Division, recomputation from archived national block group/enumeration area data resulting in a possible error of up to 1,000 feet.
5 Source: U.S. Census Bureau, Geography Division, recomputation from archived national block group data resulting in a possible error of up to 1,000 feet.
6 Source: U.S. Census Bureau, computation from national block-level data