Data / Rankings / Population under 18 / Counties in Michigan

Counties in Michigan by population under 18

St. Joseph County had the highest population under 18 of 83 counties in 2022, at 24.1%. Ontonagon County had the lowest, at 12%. The median was 19.7% and the figure for Michigan was 21.1%. Source: the U.S. Census Bureau.

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Highest24.1St. Joseph County
Lowest12Ontonagon County
Median19.783 counties
Michigan21.1History

Map of counties, 2022

Alcona County: 13.1 %Alger County: 15.1 %Allegan County: 23.3 %Alpena County: 18.6 %Antrim County: 16.6 %Arenac County: 18.4 %Baraga County: 17.9 %Barry County: 21.9 %Bay County: 19.3 %Benzie County: 16.7 %Berrien County: 21.2 %Branch County: 24.1 %Calhoun County: 22.7 %Cass County: 20.7 %Charlevoix County: 17.5 %Cheboygan County: 16.6 %Chippewa County: 18.7 %Clare County: 19.8 %Clinton County: 21.7 %Crawford County: 18.1 %Delta County: 18.9 %Dickinson County: 19.7 %Eaton County: 20.8 %Emmet County: 17.6 %Genesee County: 22 %Gladwin County: 19 %Gogebic County: 16.4 %Grand Traverse County: 19.2 %Gratiot County: 18.5 %Hillsdale County: 22 %Houghton County: 19.7 %Huron County: 18.6 %Ingham County: 19.7 %Ionia County: 21.1 %Iosco County: 17.1 %Iron County: 17.2 %Isabella County: 19.4 %Jackson County: 20.9 %Kalamazoo County: 21.6 %Kalkaska County: 19.9 %Kent County: 23.3 %Keweenaw County: 15 %Lake County: 15.3 %Lapeer County: 20.2 %Leelanau County: 15.9 %Lenawee County: 20.5 %Livingston County: 20.5 %Luce County: 16.3 %Mackinac County: 15.9 %Macomb County: 20.2 %Manistee County: 16.4 %Marquette County: 17.8 %Mason County: 19.4 %Mecosta County: 19.6 %Menominee County: 17.8 %Midland County: 21.1 %Missaukee County: 22.3 %Monroe County: 20.8 %Montcalm County: 21.1 %Montmorency County: 15.3 %Muskegon County: 22.2 %Newaygo County: 22.1 %Oakland County: 20 %Oceana County: 21.7 %Ogemaw County: 18 %Ontonagon County: 12 %Osceola County: 22.9 %Oscoda County: 18.3 %Otsego County: 20.5 %Ottawa County: 23 %Presque Isle County: 15.4 %Roscommon County: 14.1 %Saginaw County: 21 %St. Clair County: 20.1 %St. Joseph County: 24.1 %Sanilac County: 21 %Schoolcraft County: 17.7 %Shiawassee County: 20.5 %Tuscola County: 20.7 %Van Buren County: 22.7 %Washtenaw County: 17.9 %Wayne County: 23.2 %Wexford County: 22.9 %
  • Under 17
  • 17 to 18
  • 18 to 20
  • 20 to 21
  • 21 to 22
  • 22 and over
%, 2022. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2022

St. Joseph County: 24.1 %St. Joseph County24.1Branch County: 24.1 %Branch County24.1Allegan County: 23.3 %Allegan County23.3Kent County: 23.3 %Kent County23.3Wayne County: 23.2 %Wayne County23.2Ottawa County: 23 %Ottawa County23Wexford County: 22.9 %Wexford County22.9Osceola County: 22.9 %Osceola County22.9Calhoun County: 22.7 %Calhoun County22.7Van Buren County: 22.7 %Van Buren County22.7Missaukee County: 22.3 %Missaukee County22.3Muskegon County: 22.2 %Muskegon County22.2Newaygo County: 22.1 %Newaygo County22.1Hillsdale County: 22 %Hillsdale County22Genesee County: 22 %Genesee County22Barry County: 21.9 %Barry County21.9Clinton County: 21.7 %Clinton County21.7Oceana County: 21.7 %Oceana County21.7Kalamazoo County: 21.6 %Kalamazoo County21.6Berrien County: 21.2 %Berrien County21.2Midland County: 21.1 %Midland County21.1Ionia County: 21.1 %Ionia County21.1Montcalm County: 21.1 %Montcalm County21.1Sanilac County: 21 %Sanilac County21Saginaw County: 21 %Saginaw County21Jackson County: 20.9 %Jackson County20.9Monroe County: 20.8 %Monroe County20.8Eaton County: 20.8 %Eaton County20.8Cass County: 20.7 %Cass County20.7Tuscola County: 20.7 %Tuscola County20.7Shiawassee County: 20.5 %Shiawassee County20.5Livingston County: 20.5 %Livingston County20.5Lenawee County: 20.5 %Lenawee County20.5Otsego County: 20.5 %Otsego County20.5Lapeer County: 20.2 %Lapeer County20.2Macomb County: 20.2 %Macomb County20.2St. Clair County: 20.1 %St. Clair County20.1Oakland County: 20 %Oakland County20Kalkaska County: 19.9 %Kalkaska County19.9Clare County: 19.8 %Clare County19.8St. Joseph County: 24.1 %St. Joseph County24.1Branch County: 24.1 %Branch County24.1Allegan County: 23.3 %Allegan County23.3Kent County: 23.3 %Kent County23.3Wayne County: 23.2 %Wayne County23.2Ottawa County: 23 %Ottawa County23Wexford County: 22.9 %Wexford County22.9Osceola County: 22.9 %Osceola County22.9Calhoun County: 22.7 %Calhoun County22.7Van Buren County: 22.7 %Van Buren County22.7Missaukee County: 22.3 %Missaukee County22.3Muskegon County: 22.2 %Muskegon County22.2Newaygo County: 22.1 %Newaygo County22.1Hillsdale County: 22 %Hillsdale County22Genesee County: 22 %Genesee County22Barry County: 21.9 %Barry County21.9Clinton County: 21.7 %Clinton County21.7Oceana County: 21.7 %Oceana County21.7Kalamazoo County: 21.6 %Kalamazoo County21.6Berrien County: 21.2 %Berrien County21.2Midland County: 21.1 %Midland County21.1Ionia County: 21.1 %Ionia County21.1Montcalm County: 21.1 %Montcalm County21.1Sanilac County: 21 %Sanilac County21Saginaw County: 21 %Saginaw County21Jackson County: 20.9 %Jackson County20.9Monroe County: 20.8 %Monroe County20.8Eaton County: 20.8 %Eaton County20.8Cass County: 20.7 %Cass County20.7Tuscola County: 20.7 %Tuscola County20.7Shiawassee County: 20.5 %Shiawassee County20.5Livingston County: 20.5 %Livingston County20.5Lenawee County: 20.5 %Lenawee County20.5Otsego County: 20.5 %Otsego County20.5Lapeer County: 20.2 %Lapeer County20.2Macomb County: 20.2 %Macomb County20.2St. Clair County: 20.1 %St. Clair County20.1Oakland County: 20 %Oakland County20Kalkaska County: 19.9 %Kalkaska County19.9Clare County: 19.8 %Clare County19.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1St. Joseph County24.1-0.2 pts
2Branch County24.1+0.2 pts
3Allegan County23.3-0.3 pts
4Kent County23.3-0.2 pts
5Wayne County23.2-0.1 pts
6Ottawa County23-0.4 pts
7Wexford County22.9-0.1 pts
8Osceola County22.9-0.2 pts
9Calhoun County22.7-0.1 pts
10Van Buren County22.7-0.2 pts
11Missaukee County22.3-0 pts
12Muskegon County22.2-0.3 pts
13Newaygo County22.1-0 pts
14Hillsdale County22+0.2 pts
15Genesee County22-0.2 pts
16Barry County21.9-0.3 pts
17Clinton County21.7-0.3 pts
18Oceana County21.7-0.4 pts
19Kalamazoo County21.6-0.2 pts
20Berrien County21.2-0.2 pts
21Midland County21.1-0.2 pts
22Ionia County21.1-0.2 pts
23Montcalm County21.1-0 pts
24Sanilac County21-0.3 pts
25Saginaw County21-0.5 pts
26Jackson County20.9-0.2 pts
27Monroe County20.8-0.2 pts
28Eaton County20.8-0.2 pts
29Cass County20.7-0.3 pts
30Tuscola County20.7-0.1 pts
31Shiawassee County20.5-0.1 pts
32Livingston County20.5-0.3 pts
33Lenawee County20.5-0.2 pts
34Otsego County20.5+0.1 pts
35Lapeer County20.2-0.1 pts
36Macomb County20.2-0.1 pts
37St. Clair County20.1-0.3 pts
38Oakland County20-0.2 pts
39Kalkaska County19.9-0.2 pts
40Clare County19.8-0.1 pts
41Ingham County19.7-1.1 pts
42Dickinson County19.7+0.1 pts
43Houghton County19.7-0.2 pts
44Mecosta County19.60 pts
45Mason County19.4-0.4 pts
46Isabella County19.4+0.2 pts
47Bay County19.3-0.2 pts
48Grand Traverse County19.2-0.3 pts
49Gladwin County19+0.2 pts
50Delta County18.9-0.4 pts
51Chippewa County18.7-0.3 pts
52Alpena County18.60 pts
53Huron County18.6-0.1 pts
54Gratiot County18.5-1.3 pts
55Arenac County18.4+0.3 pts
56Oscoda County18.3-0.5 pts
57Crawford County18.10 pts
58Ogemaw County18-0.1 pts
59Baraga County17.9+0.2 pts
60Washtenaw County17.9-0.3 pts
61Marquette County17.8-0.2 pts
62Menominee County17.8-0.1 pts
63Schoolcraft County17.7+0.3 pts
64Emmet County17.6-0.5 pts
65Charlevoix County17.5-0.4 pts
66Iron County17.2+0.3 pts
67Iosco County17.1-0 pts
68Benzie County16.7-0.4 pts
69Antrim County16.6-0.3 pts
70Cheboygan County16.6-0.1 pts
71Gogebic County16.4-0.1 pts
72Manistee County16.4-0.2 pts
73Luce County16.3-0.9 pts
74Mackinac County15.9-0.3 pts
75Leelanau County15.9-0.1 pts
76Presque Isle County15.4+0.2 pts
77Lake County15.3-0.4 pts
78Montmorency County15.3-0.1 pts
79Alger County15.1-0.4 pts
80Keweenaw County15-0.3 pts
81Roscommon County14.1-0.4 pts
82Alcona County13.1-0.2 pts
83Ontonagon County12+0.3 pts

Other periods

About this ranking

Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. 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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in Michigan by population under 18, 2022) [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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Michigan by population under 18, 2022. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2022. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in Michigan by population under 18, 2022. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2022.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Michigan by population under 18, 2022 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/michigan-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_michigan_by_2022,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Michigan by population under 18, 2022}},
  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/population-under-18/michigan-counties?period=2022. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. 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: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Michigan by population under 18, 2022
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/population-under-18/michigan-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2022.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. 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 population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

St. Joseph County, with 24.1% in 2022, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Ontonagon County, with 12% 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, Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population under 18: other rankings

Counties in Michigan: more rankings