| Year | North Latitude | West Longitude |
|---|---|---|
| 18801 | 40° 57′ 47″ | 97° 20′ 43″ |
| 18901 | 41° 05′ 54″ | 97° 43′ 34″ |
| 19001 | 41° 08′ 43″ | 97° 42′ 10″ |
| 19101 | 41° 11′ 13″ | 97° 50′ 17″ |
| 19201 | 41° 12′ 32″ | 97° 57′ 00″ |
| 19302 | 41° 12′ 55″ | 98° 00′ 49″ |
| 19402 | 41° 13′ 18″ | 97° 58′ 38″ |
| 19503 | 41° 12′ 10″ | 97° 52′ 01″ |
| 19603 | 41° 12′ 23″ | 97° 45′ 54″ |
| 19703 | 41° 11′ 49″ | 97° 32′ 49″ |
| 19804 | 41° 11′ 57″ | 97° 34′ 11″ |
| 19905 | 41° 11′ 29″ | 97° 28′ 30″ |
| 20006 | 41° 11′ 02″ | 97° 24′ 14″ |
| 20106 | 41° 10′ 27″ | 97° 18′ 56″ |
| 20206 | 41° 10' 04" | 97° 13' 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.