Casper, WY Population by Decades
| Date |
Population |
Population
Change |
Annual
% Change |
| 1900 | 1,785 | - | - |
| 1910 | 4,766 | 2,981 | 10.3 |
| 1920 | 14,635 | 9,869 | 11.9 |
| 1930 | 24,272 | 9,637 | 5.2 |
| 1940 | 23,858 | -414 | -0.2 |
| 1950 | 31,437 | 7,579 | 2.8 |
| 1960 | 49,623 | 18,186 | 4.7 |
| 1970 | 51,264 | 1,641 | 0.3 |
| 1980 | 71,856 | 20,592 | 3.4 |
| 1990 | 61,226 | -10,630 | -1.6 |
| 2000 | 66,533 | 5,307 | 0.8 |
Source: U.S. Bureau of Census
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