Counties in Iowa by natural change, July to June
Polk County had the highest natural change, July to June of 99 counties in 2021, at 2,019. Pottawattamie County had the lowest, at -231. The median was -38 and the figure for Iowa was 379. Source: the U.S. Census Bureau.
Map of counties, 2021
- Under -60
- -60 to -30
- -30 to 0
- 0 to 30
- 30 to 150
- 150 and over
Top 40 counties, 2021
Full ranking
| Rank | Counties | 2021 | Change on 2020 |
|---|---|---|---|
| 1 | Polk County Estimated | 2,019 | -21.1% |
| 2 | Johnson County Estimated | 741 | -16.2% |
| 3 | Dallas County Estimated | 722 | -6.4% |
| 4 | Linn County Estimated | 323 | -57.1% |
| 5 | Sioux County Estimated | 175 | -26.2% |
| 6 | Story County Estimated | 172 | -34.4% |
| 7 | Woodbury County Estimated | 167 | -63.1% |
| 8 | Buena Vista County Estimated | 121 | -14.2% |
| 9 | Black Hawk County Estimated | 82 | -73.7% |
| 10 | Davis County Estimated | 59 | -20.3% |
| 11 | Buchanan County Estimated | 44 | -38% |
| 12 | Dubuque County Estimated | 35 | -84.5% |
| 13 | Lyon County Estimated | 32 | -51.5% |
| 14 | Warren County Estimated | 29 | -74.8% |
| 15 | Washington County Estimated | 28 | -52.5% |
| 16 | Crawford County Estimated | 23 | -61.7% |
| 17 | Madison County Estimated | 14 | -17.6% |
| 18 | Plymouth County Estimated | 4 | -90.2% |
| 19 | Delaware County Estimated | 2 | +300% |
| 19 | Howard County Estimated | 2 | +140% |
| 21 | Van Buren County Estimated | -4 | -300% |
| 21 | Wayne County Estimated | -4 | -100% |
| 23 | Adams County Estimated | -10 | -233.3% |
| 23 | Decatur County Estimated | -10 | -183.3% |
| 25 | Lucas County Estimated | -12 | -400% |
| 26 | Allamakee County Estimated | -14 | +22.2% |
| 26 | Mills County Estimated | -14 | +12.5% |
| 28 | Palo Alto County Estimated | -15 | +40% |
| 29 | Worth County Estimated | -16 | -214.3% |
| 30 | Winneshiek County Estimated | -20 | -81.8% |
| 31 | Tama County Estimated | -21 | -275% |
| 32 | Clay County Estimated | -23 | -360% |
| 32 | Franklin County Estimated | -23 | -283.3% |
| 32 | Wapello County Estimated | -23 | -176.7% |
| 35 | Hancock County Estimated | -24 | -166.7% |
| 35 | Osceola County Estimated | -24 | -100% |
| 37 | Benton County Estimated | -26 | -204% |
| 37 | Fremont County Estimated | -26 | +18.8% |
| 39 | Taylor County Estimated | -28 | -600% |
| 40 | Humboldt County Estimated | -30 | -57.9% |
| 40 | Marion County Estimated | -30 | -3.4% |
| 42 | Mahaska County Estimated | -32 | -346.2% |
| 43 | Sac County Estimated | -33 | -200% |
| 44 | Mitchell County Estimated | -34 | -1,800% |
| 45 | Chickasaw County Estimated | -35 | -537.5% |
| 45 | Greene County Estimated | -35 | -75% |
| 45 | Louisa County Estimated | -35 | -1,650% |
| 48 | Clarke County Estimated | -36 | -460% |
| 48 | Wright County Estimated | -36 | -125% |
| 50 | Audubon County Estimated | -38 | -137.5% |
| 51 | Adair County Estimated | -43 | -2,250% |
| 51 | Grundy County Estimated | -43 | -230.8% |
| 51 | Monroe County Estimated | -43 | -637.5% |
| 54 | Poweshiek County Estimated | -44 | +26.7% |
| 55 | Cedar County Estimated | -45 | -95.7% |
| 55 | Cherokee County Estimated | -45 | +19.6% |
| 57 | Iowa County Estimated | -46 | +6.1% |
| 58 | Pocahontas County Estimated | -47 | -235.7% |
| 58 | Ringgold County Estimated | -47 | -147.4% |
| 60 | Jefferson County Estimated | -48 | +4% |
| 61 | Winnebago County Estimated | -50 | -61.3% |
| 62 | Clayton County Estimated | -51 | -50% |
| 63 | Guthrie County Estimated | -52 | -62.5% |
| 63 | Hamilton County Estimated | -52 | -2,500% |
| 65 | Emmet County Estimated | -53 | -657.1% |
| 66 | Bremer County Estimated | -56 | -324% |
| 66 | Floyd County Estimated | -56 | -1,020% |
| 66 | Muscatine County Estimated | -56 | -146.7% |
| 69 | Ida County Estimated | -57 | -42.5% |
| 70 | Calhoun County Estimated | -58 | -48.7% |
| 71 | Carroll County Estimated | -59 | -247.1% |
| 71 | Jones County Estimated | -59 | -84.4% |
| 73 | O'Brien County Estimated | -60 | -185.7% |
| 73 | Union County Estimated | -60 | -233.3% |
| 75 | Jasper County Estimated | -61 | -6,000% |
| 76 | Dickinson County Estimated | -64 | -88.2% |
| 77 | Shelby County Estimated | -66 | -450% |
| 78 | Kossuth County Estimated | -67 | -1,240% |
| 79 | Butler County Estimated | -68 | -70% |
| 80 | Page County Estimated | -69 | +8% |
| 81 | Keokuk County Estimated | -70 | -677.8% |
| 82 | Marshall County Estimated | -71 | -607.1% |
| 83 | Jackson County Estimated | -74 | -138.7% |
| 84 | Scott County Estimated | -76 | -116% |
| 85 | Boone County Estimated | -82 | -46.4% |
| 86 | Harrison County Estimated | -84 | -154.5% |
| 86 | Monona County Estimated | -84 | -52.7% |
| 88 | Appanoose County Estimated | -86 | -196.6% |
| 88 | Cass County Estimated | -86 | -79.2% |
| 90 | Montgomery County Estimated | -89 | -107% |
| 91 | Henry County Estimated | -102 | -1,033.3% |
| 92 | Fayette County Estimated | -106 | -241.9% |
| 93 | Webster County Estimated | -124 | -853.8% |
| 94 | Des Moines County Estimated | -125 | -316.7% |
| 95 | Clinton County Estimated | -126 | -869.2% |
| 96 | Lee County Estimated | -134 | 0% |
| 97 | Hardin County Estimated | -143 | -93.2% |
| 98 | Cerro Gordo County Estimated | -186 | -135.4% |
| 99 | Pottawattamie County Estimated | -231 | -1,543.8% |
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.Citation styles
APA 7
U.S. Census Bureau. (2026). 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 (Counties in Iowa by natural change, July to June, 2021) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html
MLA 9
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, Counties in Iowa by natural change, July to June, 2021. U.S. Census Bureau, 26 Mar. 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2021. Accessed 12 Oct. 2026.
Chicago (author-date)
U.S. Census Bureau. 2026. 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. Counties in Iowa by natural change, July to June, 2021. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2021.
Harvard
U.S. Census Bureau (2026) 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, Counties in Iowa by natural change, July to June, 2021 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2021 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_iowa_by_2021,
author = {{U.S. Census Bureau}},
title = {{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: Counties in Iowa by natural change, July to June, 2021}},
year = {2026},
howpublished = {Data set},
url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
urldate = {2026-10-12},
note = {Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2021. Publisher attribution: 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.},
}
RIS
TY - DATA
AU - U.S. Census Bureau
TI - 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: Counties in Iowa by natural change, July to June, 2021
PY - 2026
DA - 2026/03/26
PB - U.S. Census Bureau
DB - Invokely
UR - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2 - https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2021
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2021.
N1 - Publisher attribution: 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.
ER -
Use this data in your AI agent
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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 2,019 in 2021, according to the U.S. Census Bureau.
Which county has the lowest natural change, July to June?
Pottawattamie County, with -231 in 2021.
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.
Natural change, July to June: other rankings
Counties in Iowa: more rankings
- Population density
- Foreign-born population share
- Bachelor's degree or higher, population 25 and over
- Population speaking Spanish at home
- Current asthma in adults, local model estimate
- Unemployment rate
- High cholesterol in screened adults, local model estimate
- High blood pressure in adults, local model estimate