Counties in Iowa by natural change, July to June, 2025
Polk County had the highest natural change, July to June of 99 counties in 2025, at 2,182. Pottawattamie County had the lowest, at -240. The median was -17 and the figure for Iowa was 2,949. Source: the U.S. Census Bureau.
Top 40 counties, 2025
Full ranking
| Rank | Counties | 2025 | Change on 2024 |
|---|---|---|---|
| 1 | Polk County Estimated | 2,182 | -0.6% |
| 2 | Johnson County Estimated | 826 | +1.6% |
| 3 | Dallas County Estimated | 751 | +0.5% |
| 4 | Linn County Estimated | 433 | +14.6% |
| 5 | Woodbury County Estimated | 382 | -2.1% |
| 6 | Black Hawk County Estimated | 195 | +12.1% |
| 7 | Sioux County Estimated | 191 | -14.7% |
| 8 | Story County Estimated | 169 | -12.9% |
| 9 | Scott County Estimated | 141 | +4.4% |
| 10 | Buena Vista County Estimated | 111 | 0% |
| 11 | Warren County Estimated | 104 | -5.5% |
| 12 | Dubuque County Estimated | 79 | +3.9% |
| 13 | Davis County Estimated | 75 | -5.1% |
| 14 | Jasper County Estimated | 55 | -8.3% |
| 15 | Crawford County Estimated | 45 | -11.8% |
| 16 | Buchanan County Estimated | 42 | -23.6% |
| 17 | Benton County Estimated | 31 | 0% |
| 18 | Wright County Estimated | 29 | -3.3% |
| 19 | Hamilton County Estimated | 23 | -11.5% |
| 20 | Washington County Estimated | 22 | -21.4% |
| 21 | Wayne County Estimated | 19 | -13.6% |
| 22 | Wapello County Estimated | 18 | -14.3% |
| 23 | Howard County Estimated | 16 | 0% |
| 24 | Tama County Estimated | 14 | 0% |
| 25 | Clarke County Estimated | 8 | -38.5% |
| 26 | Lyon County Estimated | 3 | -85.7% |
| 27 | Madison County Estimated | 2 | -81.8% |
| 28 | Decatur County Estimated | -1 | +66.7% |
| 29 | Lucas County Estimated | -2 | |
| 30 | Iowa County Estimated | -3 | -250% |
| 30 | Plymouth County Estimated | -3 | -160% |
| 32 | Jones County Estimated | -5 | +28.6% |
| 32 | Sac County Estimated | -5 | -600% |
| 32 | Van Buren County Estimated | -5 | -150% |
| 32 | Worth County Estimated | -5 | -150% |
| 36 | Allamakee County Estimated | -8 | -700% |
| 36 | Humboldt County Estimated | -8 | +27.3% |
| 38 | Bremer County Estimated | -9 | -125% |
| 38 | Winneshiek County Estimated | -9 | -125% |
| 40 | Delaware County Estimated | -11 | -257.1% |
| 40 | Grundy County Estimated | -11 | -57.1% |
| 40 | Hancock County Estimated | -11 | -83.3% |
| 43 | Adams County Estimated | -12 | -20% |
| 43 | Taylor County Estimated | -12 | -9.1% |
| 45 | Mills County Estimated | -14 | -1,300% |
| 45 | Monona County Estimated | -14 | -40% |
| 47 | Kossuth County Estimated | -16 | -33.3% |
| 47 | Palo Alto County Estimated | -16 | -60% |
| 49 | Carroll County Estimated | -17 | -70% |
| 49 | Ringgold County Estimated | -17 | +5.6% |
| 51 | Adair County Estimated | -18 | +5.3% |
| 51 | Louisa County Estimated | -18 | -20% |
| 53 | Muscatine County Estimated | -19 | -90% |
| 53 | Osceola County Estimated | -19 | -18.8% |
| 55 | O'Brien County Estimated | -21 | -50% |
| 56 | Cedar County Estimated | -23 | -27.8% |
| 56 | Emmet County Estimated | -23 | -15% |
| 56 | Fremont County Estimated | -23 | -43.8% |
| 59 | Mahaska County Estimated | -24 | -33.3% |
| 60 | Audubon County Estimated | -27 | -17.4% |
| 61 | Marshall County Estimated | -28 | 0% |
| 61 | Mitchell County Estimated | -28 | -27.3% |
| 63 | Franklin County Estimated | -30 | -20% |
| 63 | Webster County Estimated | -30 | -36.4% |
| 65 | Chickasaw County Estimated | -31 | -24% |
| 66 | Ida County Estimated | -32 | +3% |
| 66 | Jackson County Estimated | -32 | -28% |
| 68 | Fayette County Estimated | -33 | -3.1% |
| 68 | Pocahontas County Estimated | -33 | -3.1% |
| 70 | Floyd County Estimated | -36 | -44% |
| 71 | Guthrie County Estimated | -38 | -11.8% |
| 72 | Keokuk County Estimated | -39 | -25.8% |
| 73 | Greene County Estimated | -40 | -8.1% |
| 74 | Harrison County Estimated | -41 | -36.7% |
| 75 | Clayton County Estimated | -43 | -79.2% |
| 75 | Monroe County Estimated | -43 | -16.2% |
| 77 | Shelby County Estimated | -48 | -11.6% |
| 78 | Marion County Estimated | -50 | -19% |
| 79 | Butler County Estimated | -52 | -15.6% |
| 79 | Jefferson County Estimated | -52 | -4% |
| 81 | Poweshiek County Estimated | -55 | -7.8% |
| 82 | Union County Estimated | -59 | -22.9% |
| 83 | Appanoose County Estimated | -60 | -13.2% |
| 84 | Clay County Estimated | -61 | -15.1% |
| 85 | Winnebago County Estimated | -66 | -10% |
| 86 | Henry County Estimated | -69 | -25.5% |
| 87 | Calhoun County Estimated | -72 | -20% |
| 88 | Hardin County Estimated | -73 | -23.7% |
| 89 | Boone County Estimated | -74 | -13.8% |
| 90 | Montgomery County Estimated | -77 | -22.2% |
| 91 | Cass County Estimated | -91 | -11% |
| 92 | Cherokee County Estimated | -93 | -10.7% |
| 93 | Page County Estimated | -95 | -13.1% |
| 94 | Dickinson County Estimated | -104 | -11.8% |
| 95 | Clinton County Estimated | -115 | -12.7% |
| 96 | Lee County Estimated | -130 | -3.2% |
| 97 | Cerro Gordo County Estimated | -139 | -11.2% |
| 98 | Des Moines County Estimated | -156 | -6.1% |
| 99 | Pottawattamie County Estimated | -240 | -48.1% |
Other periods
About this ranking
Estimated births minus deaths of residents from July 1 of the previous year through June 30 of the reported year. A negative value means more deaths than births.
Equals births_july_june minus deaths_july_june for the same place and year. Not a calendar-year figure.
Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.
How to cite
U.S. Census Bureau. Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.Use this data in your AI agent
Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:
Rank Counties in Iowa by natural change, July to June using official data, and cite the source.
rank_places {"indicator":"natural_change_july_june","level":"province","within":"Iowa","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=natural_change_july_june&level=province&within=Iowa&limit=10Questions
Which county has the highest natural change, July to June?
Polk County, with 2,182 in 2025, according to the U.S. Census Bureau.
Which county has the lowest natural change, July to June?
Pottawattamie County, with -240 in 2025.
Where does this ranking come from?
Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program: natural change (births minus deaths), July 1 of the previous year to June 30 of the reported year; vintage 2020 files for 2011 to 2020 and the latest 2020s vintage from 2021. Retrieved 2026-10-12.