Counties in Iowa by natural change, July to June

Polk County had the highest natural change, July to June of 99 counties in 2024, at 2,196. Pottawattamie County had the lowest, at -162. The median was -12 and the figure for Iowa was 3,529. Source: the U.S. Census Bureau.

Highest2,196Polk County

Lowest-162Pottawattamie County

Median-1299 counties

Iowa3,529History

Map of counties, 2024

Under -40
-40 to -20
-20 to 0
0 to 20
20 to 100
100 and over

persons, 2024. Red areas are below zero and blue areas above it. 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. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

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

Rank	Counties	2024 persons	Change on 2023
1	Polk County Estimated	2,196	+3.5%
2	Johnson County Estimated	813	+3.3%
3	Dallas County Estimated	747	+2.8%
4	Woodbury County Estimated	390	-17.2%
5	Linn County Estimated	378	+85.3%
6	Sioux County Estimated	224	-1.8%
7	Story County Estimated	194	-2.5%
8	Black Hawk County Estimated	174	0%
9	Scott County Estimated	135	+150%
10	Buena Vista County Estimated	111	-11.9%
11	Warren County Estimated	110	-0.9%
12	Davis County Estimated	79	+17.9%
13	Dubuque County Estimated	76	+72.7%
14	Jasper County Estimated	60	+328.6%
15	Buchanan County Estimated	55	+41%
16	Crawford County Estimated	51	-20.3%
17	Benton County Estimated	31	+3,200%
18	Wright County Estimated	30	-34.8%
19	Washington County Estimated	28	+27.3%
20	Hamilton County Estimated	26	+471.4%
21	Wayne County Estimated	22	+120%
22	Lyon County Estimated	21	-50%
22	Wapello County Estimated	21	+600%
24	Howard County Estimated	16	+6.7%
25	Tama County Estimated	14	+177.8%
26	Clarke County Estimated	13	+244.4%
27	Madison County Estimated	11	-26.7%
28	Delaware County Estimated	7	+40%
29	Plymouth County Estimated	5	-82.1%
30	Iowa County Estimated	2	-50%
31	Sac County Estimated	1	+105.6%
32	Lucas County Estimated	0	+100%
33	Allamakee County Estimated	-1	-114.3%
33	Mills County Estimated	-1	+97.3%
35	Van Buren County Estimated	-2	+71.4%
35	Worth County Estimated	-2	-100%
37	Decatur County Estimated	-3	+84.2%
38	Bremer County Estimated	-4	-136.4%
38	Winneshiek County Estimated	-4	+84%
40	Hancock County Estimated	-6	-500%
41	Grundy County Estimated	-7	+78.1%
41	Jones County Estimated	-7	+58.8%
43	Adams County Estimated	-10	n/a
43	Carroll County Estimated	-10	+72.2%
43	Monona County Estimated	-10	+61.5%
43	Muscatine County Estimated	-10	+72.2%
43	Palo Alto County Estimated	-10	-11.1%
48	Humboldt County Estimated	-11	-83.3%
48	Taylor County Estimated	-11	-257.1%
50	Kossuth County Estimated	-12	+63.6%
51	O'Brien County Estimated	-14	-180%
52	Louisa County Estimated	-15	-350%
53	Fremont County Estimated	-16	+20%
53	Osceola County Estimated	-16	-300%
55	Cedar County Estimated	-18	+63.3%
55	Mahaska County Estimated	-18	-5.9%
55	Ringgold County Estimated	-18	+14.3%
58	Adair County Estimated	-19	+13.6%
59	Emmet County Estimated	-20	-300%
60	Mitchell County Estimated	-22	-340%
60	Webster County Estimated	-22	0%
62	Audubon County Estimated	-23	0%
63	Clayton County Estimated	-24	-380%
64	Chickasaw County Estimated	-25	-8.7%
64	Floyd County Estimated	-25	+24.2%
64	Franklin County Estimated	-25	n/a
64	Jackson County Estimated	-25	-525%
68	Marshall County Estimated	-28	+28.2%
69	Harrison County Estimated	-30	-350%
70	Keokuk County Estimated	-31	-416.7%
71	Fayette County Estimated	-32	-3.2%
71	Pocahontas County Estimated	-32	-39.1%
73	Ida County Estimated	-33	-230%
74	Guthrie County Estimated	-34	+15%
75	Greene County Estimated	-37	-32.1%
75	Monroe County Estimated	-37	-23.3%
77	Marion County Estimated	-42	-110%
78	Shelby County Estimated	-43	-19.4%
79	Butler County Estimated	-45	-2.3%
80	Union County Estimated	-48	-23.1%
81	Jefferson County Estimated	-50	+7.4%
82	Poweshiek County Estimated	-51	+12.1%
83	Appanoose County Estimated	-53	+3.6%
83	Clay County Estimated	-53	-341.7%
85	Henry County Estimated	-55	-66.7%
86	Hardin County Estimated	-59	+11.9%
87	Calhoun County Estimated	-60	-42.9%
87	Winnebago County Estimated	-60	-20%
89	Montgomery County Estimated	-63	-21.2%
90	Boone County Estimated	-65	+12.2%
91	Cass County Estimated	-82	-10.8%
92	Cherokee County Estimated	-84	+6.7%
92	Page County Estimated	-84	+5.6%
94	Dickinson County Estimated	-93	-138.5%
95	Clinton County Estimated	-102	+16.4%
96	Cerro Gordo County Estimated	-125	-47.1%
97	Lee County Estimated	-126	+3.1%
98	Des Moines County Estimated	-147	-54.7%
99	Pottawattamie County Estimated	-162	-134.8%

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

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, 2024) [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, 2024. 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=2024. 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, 2024. 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=2024.

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, 2024 [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=2024 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_iowa_by_2024,
  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, 2024}},
  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=2024. 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, 2024
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=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2024.
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 2,196 in 2024, according to the U.S. Census Bureau.

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

Pottawattamie County, with -162 in 2024.

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.