Orleans County - Percent Population Change, 1800-2000
| Year | 1850 | | % Pop. Chg. | 15.20463547 |
| Year | 1860 | | % Pop. Chg. | 20.84420959 |
| Year | 1870 | | % Pop. Chg. | 10.82134766 |
| Year | 1880 | | % Pop. Chg. | 4.98217257 |
| Year | 1890 | | % Pop. Chg. | 0.08151066 |
| Year | 1900 | | % Pop. Chg. | -0.34840052 |
| Year | 1910 | | % Pop. Chg. | 5.96167817 |
| Year | 1920 | | % Pop. Chg. | 2.46818357 |
| Year | 1930 | | % Pop. Chg. | -3.66746121 |
| Year | 1940 | | % Pop. Chg. | -5.72147942 |
| Year | 1950 | | % Pop. Chg. | -2.43116309 |
| Year | 1960 | | % Pop. Chg. | -4.94100991 |
| Year | 1970 | | % Pop. Chg. | 0.04964504 |
| Year | 1980 | | % Pop. Chg. | 16.31022677 |
| Year | 1990 | | % Pop. Chg. | 2.61518771 |
| Year | 2000 | | % Pop. Chg. | 9.24624787 |
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