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| Population Density: Clay County | Population | Land Area Sq. Miles |
Population Per Sq. Mile |
| - 1900 | 18,903 | 402 | 47 |
| - 1910 | 20,302 | 402 | 51 |
| - 1920 | 20,455 | 402 | 51 |
| - 1930 | 26,811 | 402 | 67 |
| - 1940 | 30,417 | 413 | 74 |
| - 1950 | 45,221 | 413 | 109 |
| - 1960 | 87,474 | 413 | 212 |
| - 1970 | 123,702 | 412 | 300 |
| - 1980 | 136,488 | 403 | 339 |
| - 1990 | 153,411 | 396 | 387 |
| 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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