Data / Rankings / Median age / Counties in Michigan

Counties in Michigan by median age

Ontonagon County had the highest median age of 83 counties in 2021, at 59 years. Isabella County had the lowest, at 29 years. The median was 43.6 years and the figure for Michigan was 39.8 years. Source: the U.S. Census Bureau.

Highest59Ontonagon County
Lowest29Isabella County
Median43.683 counties
Michigan39.8History

Top 40 counties, 2021

CSVChart (SVG)

Ontonagon CountyOntonagon County: 59 years59Alcona CountyAlcona County: 58.7 years58.7Keweenaw CountyKeweenaw County: 57.6 years57.6Roscommon CountyRoscommon County: 56.6 years56.6Montmorency CountyMontmorency County: 56.4 years56.4Presque Isle CountyPresque Isle County: 55.8 years55.8Leelanau CountyLeelanau County: 54.7 years54.7Lake CountyLake County: 54.2 years54.2Iron CountyIron County: 53.2 years53.2Iosco CountyIosco County: 52.8 years52.8Mackinac CountyMackinac County: 52.7 years52.7Oscoda CountyOscoda County: 52.4 years52.4Schoolcraft CountySchoolcraft County: 52 years52Cheboygan CountyCheboygan County: 51.7 years51.7Antrim CountyAntrim County: 51.6 years51.6Crawford CountyCrawford County: 51 years51Gladwin CountyGladwin County: 50.5 years50.5Ogemaw CountyOgemaw County: 50.5 years50.5Benzie CountyBenzie County: 50.4 years50.4Gogebic CountyGogebic County: 50.2 years50.2Arenac CountyArenac County: 50.1 years50.1Manistee CountyManistee County: 49.6 years49.6Menominee CountyMenominee County: 49.5 years49.5Alger CountyAlger County: 49.3 years49.3Charlevoix CountyCharlevoix County: 49.2 years49.2Huron CountyHuron County: 49.2 years49.2Alpena CountyAlpena County: 48.1 years48.1Clare CountyClare County: 47.8 years47.8Delta CountyDelta County: 47.4 years47.4Dickinson CountyDickinson County: 47.3 years47.3Mason CountyMason County: 46.5 years46.5Baraga CountyBaraga County: 46.1 years46.1Emmet CountyEmmet County: 45.6 years45.6Cass CountyCass County: 45.4 years45.4Sanilac CountySanilac County: 45.3 years45.3Tuscola CountyTuscola County: 44.8 years44.8Otsego CountyOtsego County: 44.6 years44.6Luce CountyLuce County: 44.5 years44.5Lapeer CountyLapeer County: 44.3 years44.3St. Clair CountySt. Clair County: 44.1 years44.1
years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2021
years
1Ontonagon County59
2Alcona County58.7
3Keweenaw County57.6
4Roscommon County56.6
5Montmorency County56.4
6Presque Isle County55.8
7Leelanau County54.7
8Lake County54.2
9Iron County53.2
10Iosco County52.8
11Mackinac County52.7
12Oscoda County52.4
13Schoolcraft County52
14Cheboygan County51.7
15Antrim County51.6
16Crawford County51
17Gladwin County50.5
17Ogemaw County50.5
19Benzie County50.4
20Gogebic County50.2
21Arenac County50.1
22Manistee County49.6
23Menominee County49.5
24Alger County49.3
25Charlevoix County49.2
25Huron County49.2
27Alpena County48.1
28Clare County47.8
29Delta County47.4
30Dickinson County47.3
31Mason County46.5
32Baraga County46.1
33Emmet County45.6
34Cass County45.4
35Sanilac County45.3
36Tuscola County44.8
37Otsego County44.6
38Luce County44.5
39Lapeer County44.3
40St. Clair County44.1
41Livingston County43.6
41Osceola County43.6
43Bay County43.5
43Oceana County43.5
45Kalkaska County43.4
46Shiawassee County43.1
47Grand Traverse County42.9
48Monroe County42.8
49Missaukee County42.5
49Newaygo County42.5
51Berrien County42.3
52Hillsdale County42.2
53Barry County42.1
54Lenawee County41.8
55Wexford County41.7
56Jackson County41.5
57Midland County41.3
58Branch County41.2
58Clinton County41.2
60Eaton County41.1
61Oakland County41
62Macomb County40.9
63Saginaw County40.8
64Montcalm County40.7
64Van Buren County40.7
66Chippewa County40.4
66Genesee County40.4
68Allegan County40.1
69Calhoun County40
70Gratiot County39.9
71St. Joseph County39.6
72Muskegon County39.4
73Marquette County39.2
74Ionia County39
75Mecosta County37.8
75Wayne County37.8
77Ottawa County35.6
78Kent County35.5
79Kalamazoo County34.6
80Washtenaw County34.1
81Houghton County32.8
82Ingham County32.7
83Isabella County29

Other periods

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/2021/table-based-SF/data/5YRData/acsdt5y2021-b01002.dat. Retrieved 2026-10-08.

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Questions

Which county has the highest median age?

Ontonagon County, with 59 years in 2021, according to the U.S. Census Bureau.

Which county has the lowest median age?

Isabella County, with 29 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, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08.

Median age: other rankings

Counties in Michigan: more rankings