Counties in Iowa by natural change, July to June
Polk County had the highest natural change, July to June of 99 counties in 2020, at 2,558. Lee County had the lowest, at -134. The median was -9 and the figure for Iowa was 6,211. Source: the U.S. Census Bureau.
Top 40 counties, 2020
Full ranking
| Rank | Counties | 2020 | Change on 2019 |
|---|---|---|---|
| 1 | Polk County Estimated | 2,558 | -15.7% |
| 2 | Johnson County Estimated | 884 | -11.6% |
| 3 | Dallas County Estimated | 771 | +2.1% |
| 4 | Linn County Estimated | 753 | -19.1% |
| 5 | Scott County Estimated | 475 | -17.2% |
| 6 | Woodbury County Estimated | 453 | +0.7% |
| 7 | Black Hawk County Estimated | 312 | -17.9% |
| 8 | Story County Estimated | 262 | -18.9% |
| 9 | Sioux County Estimated | 237 | -16.3% |
| 10 | Dubuque County Estimated | 226 | -28.5% |
| 11 | Buena Vista County Estimated | 141 | 0% |
| 12 | Muscatine County Estimated | 120 | -4.8% |
| 13 | Warren County Estimated | 115 | -27.7% |
| 14 | Davis County Estimated | 74 | -1.3% |
| 15 | Buchanan County Estimated | 71 | -19.3% |
| 16 | Lyon County Estimated | 66 | +17.9% |
| 17 | Crawford County Estimated | 60 | -7.7% |
| 18 | Washington County Estimated | 59 | +25.5% |
| 19 | Plymouth County Estimated | 41 | +46.4% |
| 20 | Wapello County Estimated | 30 | +700% |
| 21 | Benton County Estimated | 25 | -28.6% |
| 21 | Bremer County Estimated | 25 | +13.6% |
| 23 | Madison County Estimated | 17 | -48.5% |
| 24 | Pottawattamie County Estimated | 16 | -85.7% |
| 25 | Marshall County Estimated | 14 | -30% |
| 25 | Worth County Estimated | 14 | +27.3% |
| 27 | Mahaska County Estimated | 13 | -74.5% |
| 28 | Decatur County Estimated | 12 | -36.8% |
| 28 | Tama County Estimated | 12 | -61.3% |
| 30 | Clarke County Estimated | 10 | +25% |
| 31 | Chickasaw County Estimated | 8 | +300% |
| 31 | Monroe County Estimated | 8 | -20% |
| 33 | Lucas County Estimated | 4 | -63.6% |
| 34 | Adair County Estimated | 2 | -88.2% |
| 34 | Mitchell County Estimated | 2 | +122.2% |
| 36 | Delaware County Estimated | -1 | -104.8% |
| 36 | Jasper County Estimated | -1 | -102.9% |
| 36 | Van Buren County Estimated | -1 | +92.9% |
| 39 | Hamilton County Estimated | -2 | -300% |
| 39 | Louisa County Estimated | -2 | -106.3% |
| 39 | Wayne County Estimated | -2 | -112.5% |
| 42 | Adams County Estimated | -3 | -130% |
| 43 | Taylor County Estimated | -4 | -166.7% |
| 44 | Clay County Estimated | -5 | -350% |
| 44 | Floyd County Estimated | -5 | -126.3% |
| 44 | Howard County Estimated | -5 | +76.2% |
| 44 | Kossuth County Estimated | -5 | -131.3% |
| 48 | Franklin County Estimated | -6 | -200% |
| 49 | Emmet County Estimated | -7 | +46.2% |
| 50 | Hancock County Estimated | -9 | -12.5% |
| 50 | Henry County Estimated | -9 | -181.8% |
| 50 | Keokuk County Estimated | -9 | +47.1% |
| 53 | Sac County Estimated | -11 | -57.1% |
| 53 | Winneshiek County Estimated | -11 | -173.3% |
| 55 | Osceola County Estimated | -12 | -1,100% |
| 55 | Shelby County Estimated | -12 | -200% |
| 57 | Clinton County Estimated | -13 | -1,400% |
| 57 | Grundy County Estimated | -13 | +18.8% |
| 57 | Webster County Estimated | -13 | -85.7% |
| 60 | Pocahontas County Estimated | -14 | -16.7% |
| 61 | Audubon County Estimated | -16 | +40.7% |
| 61 | Mills County Estimated | -16 | +5.9% |
| 61 | Wright County Estimated | -16 | -45.5% |
| 64 | Carroll County Estimated | -17 | -185% |
| 65 | Allamakee County Estimated | -18 | -238.5% |
| 65 | Union County Estimated | -18 | -125% |
| 67 | Humboldt County Estimated | -19 | -235.7% |
| 67 | Ringgold County Estimated | -19 | +17.4% |
| 69 | Greene County Estimated | -20 | -33.3% |
| 70 | O'Brien County Estimated | -21 | -16.7% |
| 71 | Cedar County Estimated | -23 | -560% |
| 72 | Palo Alto County Estimated | -25 | +21.9% |
| 73 | Appanoose County Estimated | -29 | +12.1% |
| 73 | Marion County Estimated | -29 | -196.7% |
| 75 | Des Moines County Estimated | -30 | +48.3% |
| 76 | Fayette County Estimated | -31 | -616.7% |
| 76 | Jackson County Estimated | -31 | -3,000% |
| 76 | Winnebago County Estimated | -31 | +3.1% |
| 79 | Fremont County Estimated | -32 | -166.7% |
| 79 | Guthrie County Estimated | -32 | -23.1% |
| 79 | Jones County Estimated | -32 | -740% |
| 82 | Harrison County Estimated | -33 | -37.5% |
| 83 | Clayton County Estimated | -34 | -240% |
| 83 | Dickinson County Estimated | -34 | +8.1% |
| 85 | Calhoun County Estimated | -39 | -1,400% |
| 86 | Butler County Estimated | -40 | +11.1% |
| 86 | Ida County Estimated | -40 | +9.1% |
| 88 | Montgomery County Estimated | -43 | +27.1% |
| 89 | Cass County Estimated | -48 | +23.8% |
| 90 | Iowa County Estimated | -49 | -58.1% |
| 91 | Jefferson County Estimated | -50 | -100% |
| 92 | Monona County Estimated | -55 | -22.2% |
| 93 | Boone County Estimated | -56 | -409.1% |
| 93 | Cherokee County Estimated | -56 | -33.3% |
| 95 | Poweshiek County Estimated | -60 | +10.4% |
| 96 | Hardin County Estimated | -74 | -15.6% |
| 97 | Page County Estimated | -75 | -70.5% |
| 98 | Cerro Gordo County Estimated | -79 | -125.7% |
| 99 | Lee County Estimated | -134 | -61.4% |
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, 2020) [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, 2020. 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=2020. 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, 2020. 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=2020.
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, 2020 [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=2020 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_iowa_by_2020,
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, 2020}},
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=2020. 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, 2020
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=2020
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2020.
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
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 2,558 in 2020, according to the U.S. Census Bureau.
Which county has the lowest natural change, July to June?
Lee County, with -134 in 2020.
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.