Counties in Iowa by median age on 1 July (US county estimates)

Dickinson County had the highest median age on 1 July (US county estimates) of 99 counties in 2024, at 49.6 years. Story County had the lowest, at 26.6 years. The median was 43 years. Source: the U.S. Census Bureau.

Highest49.6Dickinson County

Lowest26.6Story County

Median4399 counties

Map of counties, 2024

Under 40
40 to 42
42 to 43
43 to 44
44 to 45
45 and over

years, 2024. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2024

years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2024 years	Change on 2023
1	Dickinson County	49.6	+0.1
2	Guthrie County	46.7	+0.3
3	Adams County	46.2	-0.6
3	Clayton County	46.2	0
5	Fremont County	45.9	0
5	Jefferson County	45.9	+0.1
7	Audubon County	45.8	-0.5
8	Butler County	45.6	+0.2
9	Ringgold County	45.4	-0.2
9	Sac County	45.4	0
11	Appanoose County	45.3	-0.1
12	Cerro Gordo County	45.2	+0.3
12	Jackson County	45.2	+0.1
12	Monona County	45.2	+0.5
15	Greene County	45.1	-0.1
16	Kossuth County	45	-0.5
17	Hancock County	44.7	-0.4
18	Cass County	44.6	+0.1
18	Shelby County	44.6	-0.3
20	Pocahontas County	44.5	-0.1
21	Cherokee County	44.4	-0.4
22	Cedar County	44.2	+0.1
22	Fayette County	44.2	+0.2
24	Montgomery County	44.1	-0.3
24	Winneshiek County	44.1	+0.3
26	Calhoun County	44	+0.3
26	Hardin County	44	+0.2
26	Worth County	44	+0.1
29	Jones County	43.9	0
29	Lee County	43.9	-0.3
29	Page County	43.9	+0.2
32	Delaware County	43.8	+0.2
32	Van Buren County	43.8	+0.3
34	Osceola County	43.7	-0.3
35	Chickasaw County	43.6	-0.4
35	Keokuk County	43.6	+0.2
37	Louisa County	43.5	0
38	Harrison County	43.4	0
38	Iowa County	43.4	+0.2
40	Adair County	43.3	-0.3
40	Mitchell County	43.3	-0.1
42	Allamakee County	43.2	+0.2
42	Emmet County	43.2	+0.3
42	Ida County	43.2	0
42	Monroe County	43.2	+0.1
46	Des Moines County	43.1	+0.1
46	Floyd County	43.1	+0.2
46	Taylor County	43.1	+0.6
49	Clay County	43	+0.2
49	Winnebago County	43	-0.1
51	Mills County	42.9	0
52	Clinton County	42.8	+0.1
52	Palo Alto County	42.8	-0.5
54	Benton County	42.7	+0.2
54	Boone County	42.7	+0.2
54	Lucas County	42.7	-0.4
57	Henry County	42.6	+0.4
58	Grundy County	42.4	0
59	Carroll County	42.2	0
59	Madison County	42.2	+0.3
61	Howard County	42.1	-0.1
61	Humboldt County	42.1	+0.2
61	Jasper County	42.1	0
61	Tama County	42.1	-0.1
65	Franklin County	42	-0.6
65	Hamilton County	42	-0.4
67	Poweshiek County	41.4	+0.3
67	Union County	41.4	-0.2
69	Plymouth County	41.3	0
70	Marion County	41.1	-0.1
70	Muscatine County	41.1	+0.3
70	Washington County	41.1	-0.1
73	Pottawattamie County	41	+0.3
74	Buchanan County	40.6	+0.3
75	Clarke County	40.4	-0.1
76	Bremer County	40.2	+0.2
77	Mahaska County	40	+0.3
77	O'Brien County	40	-0.5
79	Scott County	39.9	+0.2
80	Dubuque County	39.8	+0.2
81	Webster County	39.7	-0.2
81	Wright County	39.7	-0.5
83	Wayne County	39.5	-0.5
84	Wapello County	39.3	+0.2
85	Linn County	39.2	+0.2
86	Warren County	39	+0.2
87	Marshall County	38.7	+0.1
88	Crawford County	37.8	-0.3
89	Decatur County	37.6	+0.4
90	Lyon County	37.2	-0.2
91	Black Hawk County	36.6	0
91	Polk County	36.6	+0.1
93	Dallas County	36.5	+0.2
94	Buena Vista County	36.3	+0.2
95	Davis County	36.2	+0.1
96	Woodbury County	36.1	+0.1
97	Sioux County	33.6	0
98	Johnson County	32.2	+0.3
99	Story County	26.6	+0.2

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

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, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in Iowa by median age on 1 July (US county estimates), 2024) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Iowa by median age on 1 July (US county estimates), 2024. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/iowa-counties?period=2024. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in Iowa by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/iowa-counties?period=2024.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Iowa by median age on 1 July (US county estimates), 2024 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/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, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Iowa by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/iowa-counties?period=2024. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Iowa by median age on 1 July (US county estimates), 2024
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/median-age-july-1-us-counties/iowa-counties?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/iowa-counties?period=2024.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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 median age on 1 July (US county estimates)?

Dickinson County, with 49.6 years in 2024, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Story County, with 26.6 years 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, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.