Data / Rankings / Natural change, July to June / Counties in Iowa

Counties in Iowa by natural change, July to June

Polk County had the highest natural change, July to June of 99 counties in 2017, at 3,252. Dickinson County had the lowest, at -85. The median was -4 and the figure for Iowa was 8,211. Source: the U.S. Census Bureau.

Highest3,252Polk County
Lowest-85Dickinson County
Median-499 counties
Iowa8,211History

Top 40 counties, 2017

Polk County: 3,252 personsPolk County3,252Johnson County: 1,039 personsJohnson County1,039Linn County: 1,013 personsLinn County1,013Dallas County: 809 personsDallas County809Scott County: 583 personsScott County583Woodbury County: 467 personsWoodbury County467Story County: 370 personsStory County370Black Hawk County: 360 personsBlack Hawk County360Dubuque County: 260 personsDubuque County260Pottawattamie County: 226 personsPottawattamie County226Sioux County: 220 personsSioux County220Buena Vista County: 149 personsBuena Vista County149Muscatine County: 110 personsMuscatine County110Warren County: 96 personsWarren County96Benton County: 86 personsBenton County86Davis County: 77 personsDavis County77Wapello County: 73 personsWapello County73Buchanan County: 67 personsBuchanan County67Lyon County: 46 personsLyon County46Crawford County: 43 personsCrawford County43Allamakee County: 41 personsAllamakee County41Jones County: 30 personsJones County30Clay County: 24 personsClay County24Marion County: 23 personsMarion County23Howard County: 20 personsHoward County20Clarke County: 19 personsClarke County19Union County: 18 personsUnion County18Louisa County: 17 personsLouisa County17Wayne County: 17 personsWayne County17Plymouth County: 16 personsPlymouth County16Floyd County: 15 personsFloyd County15Franklin County: 15 personsFranklin County15Iowa County: 15 personsIowa County15Mills County: 15 personsMills County15Cedar County: 14 personsCedar County14Jackson County: 14 personsJackson County14Decatur County: 13 personsDecatur County13Madison County: 13 personsMadison County13Marshall County: 9 personsMarshall County9Delaware County: 8 personsDelaware County8
persons. Source: 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.

Full ranking

RankCounties2017
persons		Change on 2016
1Polk County Estimated3,252-10.1%
2Johnson County Estimated1,039-3.5%
3Linn County Estimated1,013-2.8%
4Dallas County Estimated809-3.1%
5Scott County Estimated583-22.6%
6Woodbury County Estimated467-21.6%
7Story County Estimated370+5.7%
8Black Hawk County Estimated360-37.3%
9Dubuque County Estimated260-22.2%
10Pottawattamie County Estimated226-27.1%
11Sioux County Estimated220-4.3%
12Buena Vista County Estimated149+38%
13Muscatine County Estimated110-8.3%
14Warren County Estimated96-46.1%
15Benton County Estimated86+32.3%
16Davis County Estimated77+45.3%
17Wapello County Estimated73+62.2%
18Buchanan County Estimated67-8.2%
19Lyon County Estimated46-45.9%
20Crawford County Estimated43-50%
21Allamakee County Estimated41n/a
22Jones County Estimated30+400%
23Clay County Estimated24+226.3%
24Marion County Estimated23-48.9%
25Howard County Estimated20+2,100%
26Clarke County Estimated19+5.6%
27Union County Estimated18+166.7%
28Louisa County Estimated17-52.8%
28Wayne County Estimated17+750%
30Plymouth County Estimated16-79.5%
31Floyd County Estimated15-28.6%
31Franklin County Estimated15+236.4%
31Iowa County Estimated15+350%
31Mills County Estimated15-28.6%
35Cedar County Estimated14+566.7%
35Jackson County Estimated14-65.9%
37Decatur County Estimated13+116.7%
37Madison County Estimated13+18.2%
39Marshall County Estimated9-84.2%
40Delaware County Estimated8-81%
41Bremer County Estimated5-94.3%
42Adams County Estimated2+113.3%
42Carroll County Estimated2-50%
42Henry County Estimated2-80%
42Mahaska County Estimated2-97.1%
46Boone County Estimated-2+94.7%
46Van Buren County Estimated-2+75%
48Worth County Estimated-3+72.7%
49Harrison County Estimated-4+84%
49Washington County Estimated-4-105.6%
49Winnebago County Estimated-4+90.7%
52Hancock County Estimated-5n/a
52Humboldt County Estimated-5+70.6%
54Lee County Estimated-6+89.3%
54Lucas County Estimated-6+68.4%
56Keokuk County Estimated-7-170%
57Tama County Estimated-8-128.6%
58Chickasaw County Estimated-10-433.3%
58Fremont County Estimated-10+16.7%
58Sac County Estimated-10+69.7%
61Pocahontas County Estimated-12+55.6%
62Osceola County Estimated-13-160%
62Wright County Estimated-13-550%
64Kossuth County Estimated-15-200%
65Clayton County Estimated-16+5.9%
66Jasper County Estimated-18-132.7%
66Montgomery County Estimated-18-260%
66Ringgold County Estimated-18-50%
66Webster County Estimated-18-325%
70Hamilton County Estimated-21-144.7%
71Ida County Estimated-23-155.6%
72Emmet County Estimated-24-300%
73Appanoose County Estimated-26-52.9%
74Adair County Estimated-27+28.9%
74Palo Alto County Estimated-27-80%
74Winneshiek County Estimated-27-640%
77Cherokee County Estimated-30+44.4%
78Audubon County Estimated-31-93.8%
79Greene County Estimated-32-357.1%
79Taylor County Estimated-32-455.6%
81Mitchell County Estimated-35-975%
82Guthrie County Estimated-36-614.3%
83O'Brien County Estimated-37-42.3%
84Hardin County Estimated-38+11.6%
85Fayette County Estimated-430%
86Monroe County Estimated-44-450%
87Shelby County Estimated-45-4.7%
88Calhoun County Estimated-46-58.6%
89Monona County Estimated-47+32.9%
90Page County Estimated-48-26.3%
91Cerro Gordo County Estimated-49+54.6%
91Grundy County Estimated-49-712.5%
93Butler County Estimated-50-13.6%
94Jefferson County Estimated-55-885.7%
95Poweshiek County Estimated-57-58.3%
96Clinton County Estimated-60-957.1%
97Cass County Estimated-68-41.7%
98Des Moines County Estimated-85-241.7%
98Dickinson County Estimated-85-347.4%

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

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_iowa_by_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2017.
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  -
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Questions

Which county has the highest natural change, July to June?

Polk County, with 3,252 in 2017, according to the U.S. Census Bureau.

Which county has the lowest natural change, July to June?

Dickinson County, with -85 in 2017.

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