Davenport-Moline-Rock Island, IA-IL Population by Decades
| Date |
Population |
Population
Change |
Annual
% Change |
| 1900 | 146,856 | - | - |
| 1910 | 172,140 | 25,284 | 1.6 |
| 1920 | 211,411 | 39,271 | 2.1 |
| 1930 | 219,374 | 7,963 | 0.4 |
| 1940 | 241,869 | 22,495 | 1.0 |
| 1950 | 280,748 | 38,879 | 1.5 |
| 1960 | 319,375 | 38,627 | 1.3 |
| 1970 | 362,638 | 43,263 | 1.3 |
| 1980 | 383,958 | 21,320 | 0.6 |
| 1990 | 350,861 | -33,097 | -0.9 |
| 2000 | 359,062 | 8,201 | 0.2 |
Source: U.S. Bureau of Census
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