| Year | North Latitude | West Longitude |
|---|---|---|
| 18801 | 43° 26′ 25″ | 71° 35′ 50″ |
| 18901 | 43° 26′ 01″ | 71° 35′ 23″ |
| 19001 | 43° 26′ 01″ | 71° 34′ 44″ |
| 19101 | 43° 21′ 18″ | 71° 32′ 10″ |
| 19201 | 43° 21′ 30″ | 71° 32′ 17″ |
| 19302 | 43° 20′ 50″ | 71° 34′ 55″ |
| 19402 | 43° 20′ 38″ | 71° 34′ 34″ |
| 19503 | 43° 20′ 25″ | 71° 32′ 05″ |
| 19603 | 43° 14′ 25″ | 71° 28′ 51″ |
| 19703 | 43° 11′ 35″ | 71° 28′ 45″ |
| 19804 | 43° 10′ 43″ | 71° 28′ 25″ |
| 19905 | 43° 09′ 42″ | 71° 27′ 55″ |
| 20006 | 43° 09′ 11″ | 71° 27′ 48″ |
| 20106 | 43° 09′ 17″ | 71° 27′ 43″ |
| 20206 | 43° 08' 57" | 71° 27' 20" |
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.