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

Ontonagon County had the highest median age on 1 July (US county estimates) of 83 counties in 2021, at 59.1 years. Isabella County had the lowest, at 30.4 years. The median was 44.2 years. Source: the U.S. Census Bureau.

Highest59.1Ontonagon County

Lowest30.4Isabella County

Median44.283 counties

Top 40 counties, 2021

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	2021 years	Change on 2020
1	Ontonagon County	59.1	-0.1
2	Alcona County	58.6	+0.3
3	Keweenaw County	57.1	-0.5
4	Montmorency County	56.7	+0.2
4	Roscommon County	56.7	+0.1
6	Presque Isle County	56.2	+0.1
7	Leelanau County	55.4	0
8	Iron County	53.9	+0.1
9	Iosco County	53.6	0
10	Oscoda County	53.5	-0.2
11	Mackinac County	53.2	-0.2
12	Schoolcraft County	53	+0.2
13	Antrim County	52	-0.1
14	Lake County	51.7	+0.2
15	Cheboygan County	51.4	+0.2
16	Gogebic County	51.3	-0.1
17	Benzie County	51	+0.2
17	Gladwin County	51	+0.1
17	Ogemaw County	51	+0.3
20	Crawford County	50.9	-0.3
21	Arenac County	50.7	+0.3
22	Manistee County	50.4	0
23	Charlevoix County	50.2	+0.3
24	Menominee County	49.9	+0.3
25	Alger County	49.7	+0.3
25	Huron County	49.7	0
27	Clare County	48.2	+0.2
28	Alpena County	47.9	-0.2
29	Delta County	47.6	-0.1
30	Emmet County	47.3	+0.1
30	Mason County	47.3	-0.3
32	Luce County	46.9	+0.9
33	Dickinson County	46.8	-0.3
34	Baraga County	46.1	-0.5
35	Kalkaska County	45.9	+0.3
36	Sanilac County	45.4	-0.1
37	Otsego County	45.1	0
38	Cass County	45	0
39	Tuscola County	44.7	+0.1
40	Lapeer County	44.5	0
41	St. Clair County	44.4	0
42	Bay County	44.2	0
43	Oceana County	44	0
44	Missaukee County	43.9	-0.1
45	Livingston County	43.6	0
46	Grand Traverse County	43.5	+0.1
47	Shiawassee County	43.4	0
48	Osceola County	43.3	-0.2
49	Newaygo County	43.2	+0.1
50	Berrien County	43.1	+0.2
51	Barry County	42.6	0
51	Hillsdale County	42.6	+0.2
53	Lenawee County	42.5	+0.2
53	Monroe County	42.5	-0.1
55	Van Buren County	42.1	0
55	Wexford County	42.1	+0.1
57	Midland County	42	-0.1
58	Chippewa County	41.7	+0.2
59	Eaton County	41.6	+0.2
60	Jackson County	41.4	+0.1
60	Macomb County	41.4	0
62	Saginaw County	41.3	0
63	Montcalm County	41.1	0
63	Oakland County	41.1	+0.1
65	Genesee County	40.9	+0.1
66	Branch County	40.7	0
67	Allegan County	40.6	+0.2
67	Gratiot County	40.6	+0.7
69	Clinton County	40.5	+0.3
70	Calhoun County	40.4	0
70	Marquette County	40.4	+0.1
70	Muskegon County	40.4	0
73	St. Joseph County	39.9	+0.2
74	Ionia County	39.5	+0.2
75	Mecosta County	39.3	+0.2
76	Wayne County	37.8	+0.2
77	Ottawa County	36.5	+0.3
78	Kalamazoo County	36.3	+0.2
79	Kent County	35.8	+0.3
80	Washtenaw County	35.5	+0.9
81	Ingham County	35.1	+1.8
82	Houghton County	33.3	-0.3
83	Isabella County	30.4	-0.1

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), 2021) [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), 2021. 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?period=2021. 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), 2021. 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?period=2021.

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), 2021 [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?period=2021 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_michigan_by_2021,
  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), 2021}},
  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?period=2021. 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), 2021
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?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/michigan-counties?period=2021.
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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Rank Counties in Michigan by median age on 1 July (US county estimates) using official data, and cite the source.

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Questions

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

Ontonagon County, with 59.1 years in 2021, 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 2021.

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.