Counties in Iowa by natural change, July to June

Polk County had the highest natural change, July to June of 99 counties in 2023, at 2,121. Lee County had the lowest, at -130. The median was -12 and the figure for Iowa was 3,428. Source: the U.S. Census Bureau.

Highest2,121Polk County

Lowest-130Lee County

Median-1299 counties

Iowa3,428History

Map of counties, 2023

Under -40
-40 to -20
-20 to 0
0 to 10
10 to 60
60 and over

persons, 2023. 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, 2023

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	2023 persons	Change on 2022
1	Polk County Estimated	2,121	+13.1%
2	Johnson County Estimated	787	+6.1%
3	Dallas County Estimated	727	-6.8%
4	Woodbury County Estimated	471	+50%
5	Sioux County Estimated	228	-12.6%
6	Linn County Estimated	204	-41.4%
7	Story County Estimated	199	+14.4%
8	Black Hawk County Estimated	174	+52.6%
9	Buena Vista County Estimated	126	+40%
10	Warren County Estimated	111	+73.4%
11	Davis County Estimated	67	+31.4%
12	Crawford County Estimated	64	+6.7%
13	Scott County Estimated	54	-21.7%
14	Wright County Estimated	46	+209.5%
15	Dubuque County Estimated	44	+25.7%
16	Lyon County Estimated	42	-45.5%
17	Buchanan County Estimated	39	+95%
18	Plymouth County Estimated	28	+21.7%
19	Washington County Estimated	22	+173.3%
20	Howard County Estimated	15	+136.6%
20	Madison County Estimated	15	-25%
22	Jasper County Estimated	14	+121.2%
23	Harrison County Estimated	12	+115.8%
24	Bremer County Estimated	11	+466.7%
25	Wayne County Estimated	10	+190.9%
26	Osceola County Estimated	8	+129.6%
27	Allamakee County Estimated	7	-88.5%
27	Taylor County Estimated	7	+128%
29	Louisa County Estimated	6	+130%
30	Delaware County Estimated	5	+150%
31	Iowa County Estimated	4	+110.8%
32	Wapello County Estimated	3	+106.3%
33	Adams County Estimated	0	+100%
33	Franklin County Estimated	0	+100%
35	Benton County Estimated	-1	-109.1%
35	Hancock County Estimated	-1	+97.4%
35	Worth County Estimated	-1	+90%
38	Jackson County Estimated	-4	+91.5%
39	Clayton County Estimated	-5	+86.5%
39	Emmet County Estimated	-5	+88.1%
39	Mitchell County Estimated	-5	+77.3%
39	O'Brien County Estimated	-5	-138.5%
43	Humboldt County Estimated	-6	n/a
43	Keokuk County Estimated	-6	+88.2%
45	Hamilton County Estimated	-7	-333.3%
45	Van Buren County Estimated	-7	-200%
47	Clarke County Estimated	-9	-200%
47	Palo Alto County Estimated	-9	+83.6%
49	Ida County Estimated	-10	+74.4%
50	Clay County Estimated	-12	+66.7%
51	Lucas County Estimated	-15	-1,400%
52	Jones County Estimated	-17	+64.6%
52	Mahaska County Estimated	-17	+76.1%
54	Sac County Estimated	-18	+70%
54	Tama County Estimated	-18	+47.1%
56	Decatur County Estimated	-19	+17.4%
57	Fremont County Estimated	-20	+55.6%
57	Marion County Estimated	-20	+77.8%
59	Ringgold County Estimated	-21	+55.3%
60	Adair County Estimated	-22	+54.2%
60	Webster County Estimated	-22	+81.4%
62	Audubon County Estimated	-23	+28.1%
62	Chickasaw County Estimated	-23	-27.8%
62	Pocahontas County Estimated	-23	-4.5%
65	Winneshiek County Estimated	-25	-19%
66	Monona County Estimated	-26	+56.7%
67	Greene County Estimated	-28	+46.2%
68	Monroe County Estimated	-30	+28.6%
69	Fayette County Estimated	-31	+40.4%
70	Grundy County Estimated	-32	-190.9%
71	Floyd County Estimated	-33	+61.2%
71	Henry County Estimated	-33	+50.7%
71	Kossuth County Estimated	-33	+25%
74	Carroll County Estimated	-36	+28%
74	Muscatine County Estimated	-36	n/a
74	Shelby County Estimated	-36	+25%
77	Mills County Estimated	-37	-32.1%
78	Dickinson County Estimated	-39	+38.1%
78	Marshall County Estimated	-39	+60.6%
78	Union County Estimated	-39	+55.2%
81	Guthrie County Estimated	-40	0%
82	Calhoun County Estimated	-42	+20.8%
83	Butler County Estimated	-44	-51.7%
84	Cedar County Estimated	-49	+43%
85	Winnebago County Estimated	-50	-177.8%
86	Montgomery County Estimated	-52	+14.8%
87	Jefferson County Estimated	-54	+23.9%
88	Appanoose County Estimated	-55	+30.4%
89	Poweshiek County Estimated	-58	-9.4%
90	Hardin County Estimated	-67	+39.6%
91	Pottawattamie County Estimated	-69	+65.8%
92	Boone County Estimated	-74	+22.9%
92	Cass County Estimated	-74	+14%
94	Cerro Gordo County Estimated	-85	+48.2%
95	Page County Estimated	-89	+16.8%
96	Cherokee County Estimated	-90	-55.2%
97	Des Moines County Estimated	-95	+35.4%
98	Clinton County Estimated	-122	-9.9%
99	Lee County Estimated	-130	+43.7%

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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_iowa_by_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2023.
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 2,121 in 2023, according to the U.S. Census Bureau.

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

Lee County, with -130 in 2023.

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.