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| Population Density: Polk County | Population | Land Area Sq. Miles |
Population Per Sq. Mile |
| - 1900 | 23,255 | 641 | 36 |
| - 1910 | 21,561 | 641 | 34 |
| - 1920 | 20,351 | 641 | 32 |
| - 1930 | 17,803 | 641 | 28 |
| - 1940 | 17,400 | 642 | 27 |
| - 1950 | 16,062 | 642 | 25 |
| - 1960 | 13,753 | 642 | 21 |
| - 1970 | 15,415 | 637 | 24 |
| - 1980 | 18,822 | 636 | 30 |
| - 1990 | 21,826 | 637 | 34 |
| SOURCE: USDC, Bureau of the Census; MO Office of Administration | |||
| Comma-delimited file - all MO Counties | histpop1.csv | ||
 | Evelyn Cleveland Last modified January 15, 1998 |
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