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 2019, at 3,035. Lee County had the lowest, at -83. The median was 5 and the figure for Iowa was 8,325. Source: the U.S. Census Bureau.

Highest3,035Polk County
Lowest-83Lee County
Median599 counties
Iowa8,325History

Top 40 counties, 2019

Polk County: 3,035 personsPolk County3,035Johnson County: 1,000 personsJohnson County1,000Linn County: 931 personsLinn County931Dallas County: 755 personsDallas County755Scott County: 574 personsScott County574Woodbury County: 450 personsWoodbury County450Black Hawk County: 380 personsBlack Hawk County380Story County: 323 personsStory County323Dubuque County: 316 personsDubuque County316Sioux County: 283 personsSioux County283Warren County: 159 personsWarren County159Buena Vista County: 141 personsBuena Vista County141Muscatine County: 126 personsMuscatine County126Pottawattamie County: 112 personsPottawattamie County112Buchanan County: 88 personsBuchanan County88Davis County: 75 personsDavis County75Crawford County: 65 personsCrawford County65Lyon County: 56 personsLyon County56Mahaska County: 51 personsMahaska County51Washington County: 47 personsWashington County47Benton County: 35 personsBenton County35Jasper County: 35 personsJasper County35Madison County: 33 personsMadison County33Louisa County: 32 personsLouisa County32Tama County: 31 personsTama County31Marion County: 30 personsMarion County30Plymouth County: 28 personsPlymouth County28Bremer County: 22 personsBremer County22Delaware County: 21 personsDelaware County21Carroll County: 20 personsCarroll County20Marshall County: 20 personsMarshall County20Decatur County: 19 personsDecatur County19Floyd County: 19 personsFloyd County19Adair County: 17 personsAdair County17Kossuth County: 16 personsKossuth County16Wayne County: 16 personsWayne County16Winneshiek County: 15 personsWinneshiek County15Humboldt County: 14 personsHumboldt County14Allamakee County: 13 personsAllamakee County13Henry County: 11 personsHenry County11
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

RankCounties2019
persons		Change on 2018
1Polk County Estimated3,035-3%
2Johnson County Estimated1,000-2.2%
3Linn County Estimated931-2.6%
4Dallas County Estimated755+4.7%
5Scott County Estimated574+6.5%
6Woodbury County Estimated450-4.3%
7Black Hawk County Estimated380-19.5%
8Story County Estimated323+14.1%
9Dubuque County Estimated316+47.7%
10Sioux County Estimated283+19.9%
11Warren County Estimated159+12.8%
12Buena Vista County Estimated141+31.8%
13Muscatine County Estimated126-1.6%
14Pottawattamie County Estimated112-39.1%
15Buchanan County Estimated88+79.6%
16Davis County Estimated75+13.6%
17Crawford County Estimated65+18.2%
18Lyon County Estimated56-32.5%
19Mahaska County Estimated51+183.3%
20Washington County Estimated47-11.3%
21Benton County Estimated35+400%
21Jasper County Estimated35+318.8%
23Madison County Estimated33+760%
24Louisa County Estimated32+77.8%
25Tama County Estimated31+203.3%
26Marion County Estimated30+700%
27Plymouth County Estimated28-3.4%
28Bremer County Estimated22-66.2%
29Delaware County Estimated21-55.3%
30Carroll County Estimated20+2,100%
30Marshall County Estimated20-67.2%
32Decatur County Estimated19+375%
32Floyd County Estimated19+1,050%
34Adair County Estimated17+221.4%
35Kossuth County Estimated16+260%
35Wayne County Estimated16+214.3%
37Winneshiek County Estimated15+193.8%
38Humboldt County Estimated14+275%
39Allamakee County Estimated13+225%
40Henry County Estimated11-15.4%
40Lucas County Estimated11+10%
40Worth County Estimated11+222.2%
43Adams County Estimated10+166.7%
43Monroe County Estimated10+145.5%
45Clarke County Estimated8-42.9%
46Fayette County Estimated6+109.7%
46Franklin County Estimated6+120.7%
46Taylor County Estimated6+500%
49Cedar County Estimated5+600%
49Jones County Estimated5+266.7%
51Calhoun County Estimated3+109.1%
52Chickasaw County Estimated2-92.9%
52Clay County Estimated2-92.6%
54Clinton County Estimated1+101.6%
54Hamilton County Estimated1+107.1%
56Jackson County Estimated-1+97.4%
56Osceola County Estimated-1+66.7%
58Shelby County Estimated-4+91.7%
59Wapello County Estimated-5-119.2%
60Sac County Estimated-7+87.5%
60Webster County Estimated-7-114.6%
62Hancock County Estimated-8-260%
62Union County Estimated-8+61.9%
64Mitchell County Estimated-9+50%
65Clayton County Estimated-10+54.5%
66Boone County Estimated-11+71.1%
66Wright County Estimated-11+65.6%
68Fremont County Estimated-12n/a
68Pocahontas County Estimated-12+67.6%
70Emmet County Estimated-13+23.5%
71Van Buren County Estimated-14-300%
72Greene County Estimated-15+6.3%
73Grundy County Estimated-16+5.9%
74Keokuk County Estimated-17-312.5%
74Mills County Estimated-17-170.8%
76O'Brien County Estimated-18+53.8%
77Howard County Estimated-21-2,000%
78Ringgold County Estimated-23+32.4%
79Harrison County Estimated-24-14.3%
80Jefferson County Estimated-25-31.6%
81Guthrie County Estimated-26-766.7%
82Audubon County Estimated-27-170%
83Iowa County Estimated-31-106.7%
84Palo Alto County Estimated-32-113.3%
84Winnebago County Estimated-32-190.9%
86Appanoose County Estimated-33+10.8%
87Cerro Gordo County Estimated-35+56.8%
88Dickinson County Estimated-37+17.8%
89Cherokee County Estimated-42-5%
90Ida County Estimated-440%
90Page County Estimated-44+31.3%
92Butler County Estimated-45+35.7%
92Monona County Estimated-45-2.3%
94Des Moines County Estimated-58-261.1%
95Montgomery County Estimated-59-31.1%
96Cass County Estimated-63-31.3%
97Hardin County Estimated-64-166.7%
98Poweshiek County Estimated-67-235%
99Lee County Estimated-83-144.1%

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.

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, 2019) [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, 2019. 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=2019. 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, 2019. 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=2019.

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, 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_iowa_by_2019,
  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, 2019}},
  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=2019. 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, 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2019.
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 3,035 in 2019, according to the U.S. Census Bureau.

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

Lee County, with -83 in 2019.

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