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| Population Density: Johnson County | Population | Land Area Sq. Miles |
Population Per Sq. Mile |
| - 1900 | 27,843 | 831 | 34 |
| - 1910 | 26,297 | 831 | 32 |
| - 1920 | 24,899 | 831 | 30 |
| - 1930 | 22,413 | 831 | 27 |
| - 1940 | 21,617 | 826 | 26 |
| - 1950 | 20,716 | 826 | 25 |
| - 1960 | 28,981 | 826 | 35 |
| - 1970 | 34,172 | 826 | 41 |
| - 1980 | 39,059 | 834 | 47 |
| - 1990 | 42,514 | 830 | 51 |
| 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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