Counties in Iowa by natural change, July to June

Polk County had the highest natural change, July to June of 99 counties in 2016, at 3,616. Cerro Gordo County had the lowest, at -108. The median was 3 and the figure for Iowa was 10,265. Source: the U.S. Census Bureau.

Highest3,616Polk County

Lowest-108Cerro Gordo County

Median399 counties

Iowa10,265History

Map of counties, 2016

Under -30
-30 to -10
-10 to 0
0 to 20
20 to 80
80 and over

persons, 2016. 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, 2016

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	2016 persons	Change on 2015
1	Polk County Estimated	3,616	+5.1%
2	Johnson County Estimated	1,077	-7.2%
3	Linn County Estimated	1,042	-6.7%
4	Dallas County Estimated	835	+0.1%
5	Scott County Estimated	753	-1.4%
6	Woodbury County Estimated	596	+7.8%
7	Black Hawk County Estimated	574	-2.9%
8	Story County Estimated	350	-10%
9	Dubuque County Estimated	334	+17.2%
10	Pottawattamie County Estimated	310	+7.3%
11	Sioux County Estimated	230	-10.9%
12	Warren County Estimated	178	+22.8%
13	Muscatine County Estimated	120	-2.4%
14	Buena Vista County Estimated	108	+2.9%
15	Bremer County Estimated	88	+120%
16	Crawford County Estimated	86	+87%
17	Lyon County Estimated	85	+51.8%
18	Plymouth County Estimated	78	+90.2%
19	Buchanan County Estimated	73	+2.8%
20	Washington County Estimated	72	+4.3%
21	Mahaska County Estimated	69	+1.5%
22	Benton County Estimated	65	-18.8%
23	Des Moines County Estimated	60	+957.1%
24	Marshall County Estimated	57	+714.3%
25	Jasper County Estimated	55	+57.1%
26	Davis County Estimated	53	-22.1%
27	Hamilton County Estimated	47	+88%
28	Marion County Estimated	45	+246.2%
28	Wapello County Estimated	45	+1,225%
30	Delaware County Estimated	42	-6.7%
31	Jackson County Estimated	41	+213.9%
32	Louisa County Estimated	36	-21.7%
33	Tama County Estimated	28	+100%
34	Floyd County Estimated	21	+800%
34	Mills County Estimated	21	-44.7%
36	Clarke County Estimated	18	-14.3%
37	Madison County Estimated	11	-50%
38	Henry County Estimated	10	-61.5%
38	Keokuk County Estimated	10	+162.5%
40	Taylor County Estimated	9	-25%
41	Grundy County Estimated	8	+140%
41	Webster County Estimated	8	+300%
43	Clinton County Estimated	7	-73.1%
43	Guthrie County Estimated	7	+122.6%
43	Jefferson County Estimated	7	-84.4%
46	Decatur County Estimated	6	-50%
47	Winneshiek County Estimated	5	+135.7%
48	Carroll County Estimated	4	-85.7%
48	Mitchell County Estimated	4	+121.1%
50	Chickasaw County Estimated	3	+133.3%
51	Wayne County Estimated	2	+200%
52	Allamakee County Estimated	0	-100%
52	Hancock County Estimated	0	-100%
54	Howard County Estimated	-1	-104.3%
55	Wright County Estimated	-2	-100%
56	Cedar County Estimated	-3	-50%
57	Kossuth County Estimated	-5	+84.8%
57	Montgomery County Estimated	-5	+86.1%
57	Osceola County Estimated	-5	-150%
60	Emmet County Estimated	-6	-20%
60	Iowa County Estimated	-6	-127.3%
62	Greene County Estimated	-7	+36.4%
63	Monroe County Estimated	-8	+76.5%
63	Van Buren County Estimated	-8	+38.5%
65	Ida County Estimated	-9	-125%
66	Jones County Estimated	-10	-176.9%
67	Franklin County Estimated	-11	-173.3%
67	Worth County Estimated	-11	+15.4%
69	Fremont County Estimated	-12	+50%
69	Ringgold County Estimated	-12	+58.6%
71	Adams County Estimated	-15	+31.8%
71	Palo Alto County Estimated	-15	+40%
73	Audubon County Estimated	-16	-166.7%
74	Appanoose County Estimated	-17	+50%
74	Clayton County Estimated	-17	-112.5%
74	Humboldt County Estimated	-17	-30.8%
77	Clay County Estimated	-19	-337.5%
77	Dickinson County Estimated	-19	-90%
77	Lucas County Estimated	-19	-11.8%
80	Harrison County Estimated	-25	+32.4%
81	O'Brien County Estimated	-26	-13%
82	Pocahontas County Estimated	-27	-237.5%
82	Union County Estimated	-27	+20.6%
84	Calhoun County Estimated	-29	-16%
85	Sac County Estimated	-33	+10.8%
86	Poweshiek County Estimated	-36	+10%
87	Adair County Estimated	-38	+38.7%
87	Boone County Estimated	-38	-642.9%
87	Page County Estimated	-38	+17.4%
90	Fayette County Estimated	-43	+23.2%
90	Hardin County Estimated	-43	-10.3%
90	Shelby County Estimated	-43	-26.5%
90	Winnebago County Estimated	-43	-95.5%
94	Butler County Estimated	-44	-33.3%
95	Cass County Estimated	-48	+18.6%
96	Cherokee County Estimated	-54	-63.6%
97	Lee County Estimated	-56	-700%
98	Monona County Estimated	-70	-75%
99	Cerro Gordo County Estimated	-108	-145.5%

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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_iowa_by_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/natural-change-july-june/iowa-counties?period=2016.
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 3,616 in 2016, according to the U.S. Census Bureau.

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

Cerro Gordo County, with -108 in 2016.

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.