Census Day by Year
| Year | Date | Time allotted |
| 1790 | 2 Aug 1790 | nine months (took 18) |
| 1800 | 4 Aug 1800 | nine months |
| 1810 | 6 Aug 1810 | ten months |
| 1820 | 7 Aug 1820 | thirteen months |
| 1830 | 1 Jun 1830 | twelve months |
| 1840 | 1 Jun 1840 | eighteen months |
| 1850 | 1 Jun 1850 | five months |
| 1860 | 1 Jun 1860 | five months |
| 1870 | 1 Jun 1870 | five months |
| 1880 | 1 Jun 1880 | one month |
| 1890 | 1 Jun 1890 | one month |
| 1900 | 1 Jun 1900 | one month |
| 1910 | 15 Apr 1910 | one month |
| 1920 | 1 Jan 1920 | one month |
| 1930 | 1 Apr 1930 | one month |
| 1940 | 1 Apr 1940 | one month |