Counties in Michigan by median age on 1 July (US county estimates), 2025

Ontonagon County had the highest median age on 1 July (US county estimates) of 83 counties in 2025, at 60.1 years. Isabella County had the lowest, at 30.4 years. The median was 44.8 years. Source: the U.S. Census Bureau.

Highest60.1Ontonagon County

Lowest30.4Isabella County

Median44.883 counties

Top 40 counties, 2025

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	2025 years	Change on 2024
1	Ontonagon County	60.1	+0.3
2	Alcona County	59	+0.1
3	Roscommon County	57.8	+0.1
4	Keweenaw County	57.1	-0.4
4	Montmorency County	57.1	+0.3
6	Presque Isle County	56.4	+0.3
7	Leelanau County	56.3	0
8	Iosco County	53.9	+0.1
8	Iron County	53.9	+0.4
8	Schoolcraft County	53.9	+0.2
11	Mackinac County	53.4	0
12	Oscoda County	53.1	-0.2
13	Lake County	52.4	+0.1
14	Antrim County	52.1	-0.3
15	Benzie County	51.8	-0.2
16	Cheboygan County	51.6	0
17	Gogebic County	51.3	-0.3
18	Charlevoix County	51.2	+0.2
19	Ogemaw County	51.1	-0.1
20	Gladwin County	51	0
21	Arenac County	50.8	+0.1
22	Manistee County	50.6	-0.1
23	Crawford County	50.3	-0.3
24	Menominee County	50	+0.1
25	Huron County	49.9	-0.2
26	Alger County	49.3	-0.1
27	Clare County	48.9	+0.1
28	Emmet County	48.4	+0.3
29	Mason County	48.3	+0.2
30	Delta County	48	+0.2
31	Alpena County	47.3	-0.1
32	Dickinson County	46.7	+0.2
33	Baraga County	46.2	+0.3
34	Luce County	46.1	+0.3
35	Kalkaska County	45.9	+0.3
35	Sanilac County	45.9	+0.1
37	Cass County	45.3	0
38	Tuscola County	45.1	+0.3
39	Otsego County	45	+0.4
40	Lapeer County	44.9	+0.1
40	Oceana County	44.9	0
42	St. Clair County	44.8	+0.1
43	Bay County	44.7	+0.1
43	Livingston County	44.7	+0.3
45	Grand Traverse County	44.6	+0.3
46	Missaukee County	44	-0.3
47	Berrien County	43.8	+0.1
48	Osceola County	43.6	+0.2
49	Newaygo County	43.4	+0.1
49	Shiawassee County	43.4	0
51	Barry County	43.3	+0.3
51	Lenawee County	43.3	+0.3
53	Monroe County	43.2	+0.2
54	Gratiot County	42.9	+0.6
55	Van Buren County	42.7	+0.3
56	Hillsdale County	42.6	+0.1
56	Midland County	42.6	+0.2
56	Wexford County	42.6	+0.2
59	Saginaw County	42.3	+0.2
60	Chippewa County	42	+0.1
61	Clinton County	41.9	+0.4
61	Eaton County	41.9	+0.1
61	Jackson County	41.9	+0.1
64	Oakland County	41.7	+0.2
65	Macomb County	41.6	0
66	Allegan County	41.5	+0.1
67	Genesee County	41.3	+0.1
68	Montcalm County	41.2	0
69	Branch County	41	+0.2
69	Muskegon County	41	+0.2
71	Calhoun County	40.7	+0.1
72	St. Joseph County	40.3	+0.1
73	Ionia County	40.2	+0.1
74	Marquette County	40	+0.1
74	Mecosta County	40	+0.3
76	Wayne County	38.3	+0.2
77	Ottawa County	37.5	+0.3
78	Kent County	36.6	+0.3
79	Kalamazoo County	36.5	+0.1
80	Washtenaw County	36.3	+0.3
81	Ingham County	33.6	+0.1
82	Houghton County	32.7	-0.1
83	Isabella County	30.4	0

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 Michigan by median age on 1 July (US county estimates), 2025) [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 Michigan by median age on 1 July (US county estimates), 2025. 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/michigan-counties. 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 Michigan by median age on 1 July (US county estimates), 2025. 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/michigan-counties.

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 Michigan by median age on 1 July (US county estimates), 2025 [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/michigan-counties (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_michigan_by_2025,
  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 Michigan by median age on 1 July (US county estimates), 2025}},
  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/michigan-counties. 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 Michigan by median age on 1 July (US county estimates), 2025
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/michigan-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/michigan-counties.
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)?

Ontonagon County, with 60.1 years in 2025, according to the U.S. Census Bureau.

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

Isabella County, with 30.4 years in 2025.

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.