Ranking of Iowa Counties By Population in 2021
Updated on August 1, 2024.
Based on the US Census Vintage data estimates, in 2021, the Population for Iowa was 3.20M. Among all Iowa counties, Polk County had the highest population (497.84K), followed by Linn County (229.45K), and Scott County (174.23K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Iowa counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Iowa Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2021 Census.
See this for other years:
Ranking of Iowa Counties By Population in 2021
Rank | County | Population |
|---|---|---|
| 1 | Polk County | 497,842 |
| 2 | Linn County | 229,445 |
| 3 | Scott County | 174,225 |
| 4 | Johnson County | 155,035 |
| 5 | Black Hawk County | 130,576 |
| 6 | Woodbury County | 105,749 |
| 7 | Dallas County | 104,174 |
| 8 | Story County | 99,679 |
| 9 | Dubuque County | 98,854 |
| 10 | Pottawattamie County | 93,410 |
| 11 | Warren County | 53,485 |
| 12 | Clinton County | 46,483 |
| 13 | Cerro Gordo County | 42,761 |
| 14 | Muscatine County | 42,674 |
| 15 | Marshall County | 39,913 |
| 16 | Des Moines County | 38,506 |
| 17 | Jasper County | 37,874 |
| 18 | Webster County | 37,170 |
| 19 | Sioux County | 35,959 |
| 20 | Wapello County | 35,295 |
| 21 | Marion County | 33,441 |
| 22 | Lee County | 33,257 |
| 23 | Boone County | 26,761 |
| 24 | Benton County | 25,738 |
| 25 | Plymouth County | 25,731 |
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