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| Cedar County, Iowa |
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| Source: U. S. Bureau of the Census, Decennial Census |
| 2010: SF1, American FactFinder Table P1 |
| 1900-1990 Censuses: Population of Counties by Decennial Census: 1900 to 1990 Compiled and edited by Richard L. Forstall, Population Division U. S. Bureau of the Census |
| 1850-1890 Censuses: Eleventh Census of the United States - 1890, Table 4 |
| Prepared by State Library of Iowa, State Data Cente Program, 800-248-4483 |
| Cedar County information extracted by Lynn McCleary, July 5, 2020 |
| Year | Rank | Population |
| 1850 | 21 | 3,941 |
| 1860 | 22 | 12,949 |
| 1870 | 20 | 19,731 |
| 1880 | 32 | 18,936 |
| 1890 | 44 | 18,253 |
| 1900 | 49 | 19,371 |
| 1910 | 51 | 17,765 |
| 1920 | 58 | 17,560 |
| 1930 | 62 | 16,760 |
| 1940 | 62 | 16,884 |
| 1950 | 52 | 17,791 |
| 1960 | 52 | 17,007 |
| 1970 | 48 | 17,655 |
| 1980 | 47 | 18,635 |
| 1990 | 43 | 17,444 |
| 2000 | 41 | 18,187 |
| 2010 | 38 | 18,499 |