Demographics
| Historical Populations | ||
|---|---|---|
| Year | Pop. | ±% |
| 1860 | 1,367 | — |
| 1870 | 1,822 | +33.3% |
| 1880 | 1,939 | +6.4% |
| 1890 | 3,094 | +59.6% |
| 1900 | 4,102 | +32.6% |
| 1910 | 4,400 | +7.3% |
| 1920 | 4,138 | −6.0% |
| 1930 | 4,348 | +5.1% |
| 1940 | 4,721 | +8.6% |
| 1950 | 5,916 | +25.3% |
| 1960 | 10,882 | +83.9% |
| 1970 | 18,028 | +65.7% |
| 1980 | 19,474 | +8.0% |
| 1990 | 20,403 | +4.8% |
| 2000 | 26,294 | +28.9% |
| 2010 | 34,768 | +32.2% |
| Source:"American FactFinder". United States Census Bureau. http://factfinder.census.gov. and Iowa Data Center | ||
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