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| Population Density: St. Clair County | Population | Land Area Sq. Miles |
Population Per Sq. Mile |
| - 1900 | 17,907 | 706 | 25 |
| - 1910 | 16,412 | 706 | 23 |
| - 1920 | 15,341 | 706 | 22 |
| - 1930 | 13,289 | 706 | 19 |
| - 1940 | 13,146 | 699 | 19 |
| - 1950 | 10,482 | 699 | 15 |
| - 1960 | 8,421 | 699 | 12 |
| - 1970 | 7,667 | 697 | 11 |
| - 1980 | 8,622 | 699 | 12 |
| - 1990 | 8,457 | 677 | 13 |
| 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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