Counties in Iowa by natural change, July to June

Polk County had the highest natural change, July to June of 99 counties in 2015, at 3,440. Adair County had the lowest, at -62. The median was -1 and the figure for Iowa was 9,946. Source: the U.S. Census Bureau.

Highest3,440Polk County

Lowest-62Adair County

Median-199 counties

Iowa9,946History

Map of counties, 2015

Under -30
-30 to -10
-10 to 0
0 to 20
20 to 70
70 and over

persons, 2015. 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, 2015

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	2015 persons	Change on 2014
1	Polk County Estimated	3,440	-6.1%
2	Johnson County Estimated	1,160	+3.8%
3	Linn County Estimated	1,117	+4.5%
4	Dallas County Estimated	834	+7.9%
5	Scott County Estimated	764	-11.5%
6	Black Hawk County Estimated	591	+16.8%
7	Woodbury County Estimated	553	-13.3%
8	Story County Estimated	389	-7.4%
9	Pottawattamie County Estimated	289	+5.1%
10	Dubuque County Estimated	285	-16.9%
11	Sioux County Estimated	258	-1.5%
12	Warren County Estimated	145	+6.6%
13	Muscatine County Estimated	123	-26.8%
14	Buena Vista County Estimated	105	-23.9%
15	Benton County Estimated	80	+21.2%
16	Buchanan County Estimated	71	0%
17	Washington County Estimated	69	+4.5%
18	Davis County Estimated	68	+28.3%
18	Mahaska County Estimated	68	+33.3%
20	Lyon County Estimated	56	-26.3%
21	Crawford County Estimated	46	-45.9%
21	Louisa County Estimated	46	+70.4%
23	Delaware County Estimated	45	+9.8%
23	Jefferson County Estimated	45	+336.8%
25	Plymouth County Estimated	41	-14.6%
26	Bremer County Estimated	40	-29.8%
27	Mills County Estimated	38	+46.2%
28	Jasper County Estimated	35	+34.6%
29	Carroll County Estimated	28	+75%
30	Clinton County Estimated	26	+136.4%
30	Henry County Estimated	26	+188.9%
32	Hamilton County Estimated	25	-26.5%
33	Howard County Estimated	23	+283.3%
34	Iowa County Estimated	22	+57.1%
34	Madison County Estimated	22	-24.1%
36	Clarke County Estimated	21	+320%
37	Allamakee County Estimated	15	-25%
37	Franklin County Estimated	15	-31.8%
39	Tama County Estimated	14	-51.7%
40	Jones County Estimated	13	+262.5%
40	Marion County Estimated	13	-77.6%
42	Decatur County Estimated	12	+220%
42	Taylor County Estimated	12	+271.4%
44	Osceola County Estimated	10	-9.1%
45	Clay County Estimated	8	+200%
46	Boone County Estimated	7	+129.2%
46	Marshall County Estimated	7	-93.1%
48	Hancock County Estimated	4	+116%
49	Webster County Estimated	2	+118.2%
50	Wright County Estimated	-1	+85.7%
51	Cedar County Estimated	-2	-166.7%
51	Wayne County Estimated	-2	-115.4%
53	Floyd County Estimated	-3	-400%
54	Ida County Estimated	-4	-100%
54	Wapello County Estimated	-4	-128.6%
56	Emmet County Estimated	-5	n/a
57	Audubon County Estimated	-6	+66.7%
58	Des Moines County Estimated	-7	-333.3%
58	Lee County Estimated	-7	+72%
60	Clayton County Estimated	-8	-133.3%
60	Pocahontas County Estimated	-8	-60%
62	Chickasaw County Estimated	-9	-169.2%
63	Dickinson County Estimated	-10	+81.5%
64	Greene County Estimated	-11	+50%
65	Humboldt County Estimated	-13	+7.1%
65	Van Buren County Estimated	-13	-18.2%
65	Worth County Estimated	-13	-1,200%
68	Winneshiek County Estimated	-14	-100%
69	Keokuk County Estimated	-16	-206.7%
70	Lucas County Estimated	-17	-70%
71	Mitchell County Estimated	-19	-371.4%
72	Grundy County Estimated	-20	-766.7%
73	Adams County Estimated	-22	-540%
73	Winnebago County Estimated	-22	-164.7%
75	O'Brien County Estimated	-23	-43.8%
76	Fremont County Estimated	-24	-84.6%
77	Calhoun County Estimated	-25	+37.5%
77	Palo Alto County Estimated	-25	-19%
79	Ringgold County Estimated	-29	-123.1%
80	Guthrie County Estimated	-31	-106.7%
81	Butler County Estimated	-33	-57.1%
81	Cherokee County Estimated	-33	-94.1%
81	Kossuth County Estimated	-33	+8.3%
84	Appanoose County Estimated	-34	-112.5%
84	Monroe County Estimated	-34	+2.9%
84	Shelby County Estimated	-34	+8.1%
84	Union County Estimated	-34	-13.3%
88	Jackson County Estimated	-36	-800%
88	Montgomery County Estimated	-36	+2.7%
90	Harrison County Estimated	-37	-276.2%
90	Sac County Estimated	-37	-131.3%
92	Hardin County Estimated	-39	-69.6%
93	Monona County Estimated	-40	+55.6%
93	Poweshiek County Estimated	-40	+31%
95	Cerro Gordo County Estimated	-44	-238.5%
96	Page County Estimated	-46	-411.1%
97	Fayette County Estimated	-56	+20%
98	Cass County Estimated	-59	+4.8%
99	Adair County Estimated	-62	-106.7%

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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_iowa_by_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2015.
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 3,440 in 2015, according to the U.S. Census Bureau.

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

Adair County, with -62 in 2015.

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.