Federal Census Schedule
| Census | Year | Series | Census Day |
| 1st | 1790 | M637 | August 2 (1st Monday in August) |
| 2nd | 1800 | M32 | August 4 (1st Monday in August) |
| 3rd | 1810 | M252 | August 6 (1st Monday in August) |
| 4th | 1820 | M33 | August 7 (1st Monday in August) |
| 5th | 1830 | M19 | June 1 |
| 6th | 1840 | M704 | June 1 |
| 7th | 1850 | M432 | June 1 |
| 8th | 1860 | M653 | June 1 |
| 9th | 1870 | M593 | June 1 |
| 10th | 1880 | T9 | June 1 |
| 11th | 1890 | M123 | June 1 |
| 12th | 1900 | T623 | June 1 |
| 13th | 1910 | T624 | April 15 |
| 14th | 1920 | T625 | January 1 |
| 15th | 1930 | T626 | April 1 |
| 16th | 1940 | T627 | April 1 |
| 17th | 1950 | T628 | April 1 |
| 18th | 1960 | April 1 | |
| 19th | 1970 | April 1 | |
| 20th | 1980 | April 1 |