Counties in Iowa by natural change, July to June
Polk County had the highest natural change, July to June of 99 counties in 2018, at 3,130. Cerro Gordo County had the lowest, at -81. The median was -5 and the figure for Iowa was 7,911. Source: the U.S. Census Bureau.
Top 40 counties, 2018
Full ranking
| Rank | Counties | 2018 | Change on 2017 |
|---|---|---|---|
| 1 | Polk County Estimated | 3,130 | -3.8% |
| 2 | Johnson County Estimated | 1,023 | -1.5% |
| 3 | Linn County Estimated | 956 | -5.6% |
| 4 | Dallas County Estimated | 721 | -10.9% |
| 5 | Scott County Estimated | 539 | -7.5% |
| 6 | Black Hawk County Estimated | 472 | +31.1% |
| 7 | Woodbury County Estimated | 470 | +0.6% |
| 8 | Story County Estimated | 283 | -23.5% |
| 9 | Sioux County Estimated | 236 | +7.3% |
| 10 | Dubuque County Estimated | 214 | -17.7% |
| 11 | Pottawattamie County Estimated | 184 | -18.6% |
| 12 | Warren County Estimated | 141 | +46.9% |
| 13 | Muscatine County Estimated | 128 | +16.4% |
| 14 | Buena Vista County Estimated | 107 | -28.2% |
| 15 | Lyon County Estimated | 83 | +80.4% |
| 16 | Davis County Estimated | 66 | -14.3% |
| 17 | Bremer County Estimated | 65 | +1,200% |
| 18 | Marshall County Estimated | 61 | +577.8% |
| 19 | Crawford County Estimated | 55 | +27.9% |
| 20 | Washington County Estimated | 53 | +1,425% |
| 21 | Buchanan County Estimated | 49 | -26.9% |
| 22 | Webster County Estimated | 48 | +366.7% |
| 23 | Delaware County Estimated | 47 | +487.5% |
| 24 | Des Moines County Estimated | 36 | +142.4% |
| 25 | Plymouth County Estimated | 29 | +81.3% |
| 26 | Chickasaw County Estimated | 28 | +380% |
| 27 | Clay County Estimated | 27 | +12.5% |
| 28 | Wapello County Estimated | 26 | -64.4% |
| 29 | Mills County Estimated | 24 | +60% |
| 30 | Louisa County Estimated | 18 | +5.9% |
| 30 | Mahaska County Estimated | 18 | +800% |
| 32 | Clarke County Estimated | 14 | -26.3% |
| 33 | Henry County Estimated | 13 | +550% |
| 34 | Lucas County Estimated | 10 | +266.7% |
| 35 | Keokuk County Estimated | 8 | +214.3% |
| 36 | Benton County Estimated | 7 | -91.9% |
| 36 | Van Buren County Estimated | 7 | +450% |
| 38 | Hancock County Estimated | 5 | +200% |
| 39 | Allamakee County Estimated | 4 | -90.2% |
| 39 | Decatur County Estimated | 4 | -69.2% |
| 41 | Taylor County Estimated | 1 | +103.1% |
| 42 | Fremont County Estimated | 0 | +100% |
| 43 | Carroll County Estimated | -1 | -150% |
| 43 | Cedar County Estimated | -1 | -107.1% |
| 43 | Howard County Estimated | -1 | -105% |
| 46 | Floyd County Estimated | -2 | -113.3% |
| 47 | Guthrie County Estimated | -3 | +91.7% |
| 47 | Jones County Estimated | -3 | -110% |
| 47 | Osceola County Estimated | -3 | +76.9% |
| 50 | Madison County Estimated | -5 | -138.5% |
| 50 | Marion County Estimated | -5 | -121.7% |
| 52 | Humboldt County Estimated | -8 | -60% |
| 53 | Worth County Estimated | -9 | -200% |
| 54 | Audubon County Estimated | -10 | +67.7% |
| 54 | Kossuth County Estimated | -10 | +33.3% |
| 56 | Winnebago County Estimated | -11 | -175% |
| 57 | Adair County Estimated | -14 | +48.1% |
| 57 | Hamilton County Estimated | -14 | +33.3% |
| 57 | Wayne County Estimated | -14 | -182.4% |
| 60 | Adams County Estimated | -15 | -850% |
| 60 | Iowa County Estimated | -15 | -200% |
| 60 | Palo Alto County Estimated | -15 | +44.4% |
| 63 | Greene County Estimated | -16 | +50% |
| 63 | Jasper County Estimated | -16 | +11.1% |
| 63 | Winneshiek County Estimated | -16 | +40.7% |
| 66 | Emmet County Estimated | -17 | +29.2% |
| 66 | Grundy County Estimated | -17 | +65.3% |
| 68 | Mitchell County Estimated | -18 | +48.6% |
| 69 | Jefferson County Estimated | -19 | +65.5% |
| 70 | Poweshiek County Estimated | -20 | +64.9% |
| 71 | Harrison County Estimated | -21 | -425% |
| 71 | Union County Estimated | -21 | -216.7% |
| 73 | Clayton County Estimated | -22 | -37.5% |
| 73 | Monroe County Estimated | -22 | +50% |
| 75 | Hardin County Estimated | -24 | +36.8% |
| 76 | Franklin County Estimated | -29 | -293.3% |
| 77 | Tama County Estimated | -30 | -275% |
| 78 | Wright County Estimated | -32 | -146.2% |
| 79 | Calhoun County Estimated | -33 | +28.3% |
| 80 | Lee County Estimated | -34 | -466.7% |
| 80 | Ringgold County Estimated | -34 | -88.9% |
| 82 | Appanoose County Estimated | -37 | -42.3% |
| 82 | Pocahontas County Estimated | -37 | -208.3% |
| 84 | Boone County Estimated | -38 | -1,800% |
| 84 | Jackson County Estimated | -38 | -371.4% |
| 86 | O'Brien County Estimated | -39 | -5.4% |
| 87 | Cherokee County Estimated | -40 | -33.3% |
| 88 | Ida County Estimated | -44 | -91.3% |
| 88 | Monona County Estimated | -44 | +6.4% |
| 90 | Dickinson County Estimated | -45 | +47.1% |
| 90 | Montgomery County Estimated | -45 | -150% |
| 92 | Cass County Estimated | -48 | +29.4% |
| 92 | Shelby County Estimated | -48 | -6.7% |
| 94 | Sac County Estimated | -56 | -460% |
| 95 | Fayette County Estimated | -62 | -44.2% |
| 96 | Clinton County Estimated | -63 | -5% |
| 97 | Page County Estimated | -64 | -33.3% |
| 98 | Butler County Estimated | -70 | -40% |
| 99 | Cerro Gordo County Estimated | -81 | -65.3% |
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, 2018) [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, 2018. 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=2018. 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, 2018. 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=2018.
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, 2018 [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=2018 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_iowa_by_2018,
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, 2018}},
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=2018. 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, 2018
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=2018
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2018.
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 3,130 in 2018, according to the U.S. Census Bureau.
Which county has the lowest natural change, July to June?
Cerro Gordo County, with -81 in 2018.
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