Counties in Iowa by median age

Name: Counties in Iowa by median age, 2022
Creator: U.S. Census Bureau
License: Public domain (US federal government work, citation requested)

Audubon County had the highest median age of 99 counties in 2022, at 48.2 years. Story County had the lowest, at 26.5 years. The median was 42.2 years and the figure for Iowa was 38.4 years. Source: the U.S. Census Bureau.

Highest48.2Audubon County

Lowest26.5Story County

Median42.299 counties

Iowa38.4History

Top 40 counties, 2022

CSV Chart (SVG)

years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

Rank	Counties	2022 years	Change on 2021
1	Audubon County	48.2	+0.1
2	Dickinson County	47.9	+0.1
3	Clayton County	46.9	-0.2
4	Adams County	46.3	-0.4
5	Fremont County	46.2	+0.1
6	Guthrie County	45.9	+0.2
6	Monona County	45.9	-0.4
8	Shelby County	45.5	+0.2
9	Pocahontas County	45.4	0
10	Hardin County	45.3	+0.6
11	Page County	45.2	+0.8
11	Sac County	45.2	-0.9
13	Kossuth County	45.1	+0.4
14	Appanoose County	45	+0.1
14	Van Buren County	45	0
16	Cass County	44.8	+0.6
16	Cherokee County	44.8	0
16	Emmet County	44.8	+1.8
19	Greene County	44.6	+0.3
20	Hancock County	44.4	+0.2
20	Jackson County	44.4	+0.3
22	Cerro Gordo County	44.3	+0.1
23	Jefferson County	44.2	+2.6
24	Taylor County	44.1	+0.5
25	Chickasaw County	44	+0.6
25	Floyd County	44	+0.4
25	Osceola County	44	+0.2
28	Worth County	43.9	+0.5
29	Ringgold County	43.8	-0.5
30	Butler County	43.6	+0.1
31	Delaware County	43.5	-0.2
31	Lee County	43.5	+0.3
33	Fayette County	43.4	+0.4
33	Jones County	43.4	+0.7
35	Cedar County	43.3	+0.7
35	Montgomery County	43.3	+0.7
37	Allamakee County	43.1	-0.4
38	Adair County	43	-0.4
38	Benton County	43	-0.1
40	Lucas County	42.9	-1.1
41	Franklin County	42.8	-0.5
41	Ida County	42.8	+1
43	Keokuk County	42.7	-0.2
43	Mills County	42.7	+0.3
45	Winneshiek County	42.6	+0.9
46	Clinton County	42.5	0
47	Calhoun County	42.4	-1.1
47	Carroll County	42.4	+0.4
49	Iowa County	42.2	-0.7
49	Louisa County	42.2	+0.4
51	Des Moines County	42.1	-0.6
52	Boone County	42	-0.2
52	Harrison County	42	-0.4
54	Hamilton County	41.9	-0.1
54	Humboldt County	41.9	-0.2
54	Wayne County	41.9	+0.3
57	Mitchell County	41.8	0
58	Grundy County	41.6	-0.4
59	Clay County	41.5	+0.5
59	Monroe County	41.5	-0.1
59	Winnebago County	41.5	+0.1
59	Wright County	41.5	-0.8
63	Palo Alto County	41.3	-0.6
64	Jasper County	41	+0.1
64	Tama County	41	-0.8
66	Madison County	40.9	+0.4
66	Plymouth County	40.9	+0.5
68	Poweshiek County	40.7	0
69	Henry County	40.4	-0.2
69	O'Brien County	40.4	-0.3
71	Washington County	40.1	-0.1
72	Union County	40	+0.3
73	Marion County	39.8	+0.2
73	Webster County	39.8	+0.6
75	Pottawattamie County	39.7	+0.2
76	Mahaska County	39.6	+1
77	Buchanan County	39.5	+0.3
77	Howard County	39.5	-1
79	Wapello County	39.4	+0.2
80	Clarke County	39.3	+1.1
81	Bremer County	38.9	-0.1
82	Dubuque County	38.7	+0.1
82	Scott County	38.7	0
84	Muscatine County	38.6	+0.3
85	Marshall County	38.5	+0.1
85	Warren County	38.5	+0.1
87	Lyon County	38.3	+0.4
88	Linn County	38.2	+0.3
89	Crawford County	37.3	+0.1
90	Decatur County	36.6	+0.7
91	Davis County	36.3	+0.3
92	Polk County	36.1	+0.2
93	Woodbury County	35.9	+0.1
94	Buena Vista County	35.6	+0.4
94	Dallas County	35.6	+0.1
96	Black Hawk County	35.5	-0.1
97	Sioux County	34.4	+0.6
98	Johnson County	30.6	-0.1
99	Story County	26.5	-0.4

Other periods

2024
2023
2022
2021

About this ranking

Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

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. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2022/table-based-SF/data/5YRData/acsdt5y2022-b01002.dat. Retrieved 2026-10-08.

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Rank Counties in Iowa by median age using official data, and cite the source.

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Questions

Which county has the highest median age?

Audubon County, with 48.2 years in 2022, according to the U.S. Census Bureau.

Which county has the lowest median age?

Story County, with 26.5 years in 2022.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08.