We used SocialExplorer to generate population density maps from the 1790 to 2000 decennial censuses at the county level. For 2010, we used the American Home Community Survey 5-year estimate.
We broke the data down into deciles for each year with each color representing a decile of population density. The blues are the bottom deciles and the oranges are the upper deciles.
1. 1790
2. 1800
3. 1810
4. 1820
5. 1830
6. 1840
7. 1850
8. 1860
9. 1870
10. 1880
11. 1890
12. 1900
13. 1910
14. 1920
15. 1930
16. 1940
17. 1950
18. 1960
19. 1970
20. 1980
21. 1990
22. 2000
23. 2010
