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 2023, at 23.8%. Ontonagon County had the lowest, at 12%. The median was 19.5% and the figure for Michigan was 20.9%. Source: the U.S. Census Bureau.

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Highest23.8St. Joseph County
Lowest12Ontonagon County
Median19.583 counties
Michigan20.9History

Map of counties, 2023

Alcona County: 13 %Alger County: 14.7 %Allegan County: 22.9 %Alpena County: 18.6 %Antrim County: 16.5 %Arenac County: 18.3 %Baraga County: 17.6 %Barry County: 21.7 %Bay County: 19.1 %Benzie County: 16.6 %Berrien County: 20.9 %Branch County: 23.7 %Calhoun County: 22.5 %Cass County: 20.5 %Charlevoix County: 17.4 %Cheboygan County: 16.1 %Chippewa County: 18.4 %Clare County: 19.7 %Clinton County: 21.4 %Crawford County: 17.8 %Delta County: 18.7 %Dickinson County: 19.6 %Eaton County: 20.7 %Emmet County: 17.4 %Genesee County: 21.7 %Gladwin County: 19.1 %Gogebic County: 16.3 %Grand Traverse County: 18.9 %Gratiot County: 17 %Hillsdale County: 22 %Houghton County: 19.5 %Huron County: 18.4 %Ingham County: 19.5 %Ionia County: 20.9 %Iosco County: 17.1 %Iron County: 17.1 %Isabella County: 19.1 %Jackson County: 20.6 %Kalamazoo County: 21.3 %Kalkaska County: 19.5 %Kent County: 23.1 %Keweenaw County: 14.9 %Lake County: 14.9 %Lapeer County: 19.9 %Leelanau County: 15.6 %Lenawee County: 20.5 %Livingston County: 20.2 %Luce County: 15.7 %Mackinac County: 15.4 %Macomb County: 20.1 %Manistee County: 16.4 %Marquette County: 17.5 %Mason County: 18.7 %Mecosta County: 19.5 %Menominee County: 17.5 %Midland County: 21 %Missaukee County: 21.9 %Monroe County: 20.6 %Montcalm County: 20.5 %Montmorency County: 15.2 %Muskegon County: 22 %Newaygo County: 21.8 %Oakland County: 19.8 %Oceana County: 21.2 %Ogemaw County: 17.8 %Ontonagon County: 12 %Osceola County: 22.6 %Oscoda County: 18.9 %Otsego County: 20.4 %Ottawa County: 22.6 %Presque Isle County: 15.2 %Roscommon County: 13.9 %Saginaw County: 20.6 %St. Clair County: 19.8 %St. Joseph County: 23.8 %Sanilac County: 20.7 %Schoolcraft County: 17.7 %Shiawassee County: 20.5 %Tuscola County: 20.4 %Van Buren County: 22.5 %Washtenaw County: 17.6 %Wayne County: 23 %Wexford County: 22.7 %
  • Under 16
  • 16 to 18
  • 18 to 20
  • 20 to 21
  • 21 to 22
  • 22 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2023

St. Joseph County: 23.8 %St. Joseph County23.8Branch County: 23.7 %Branch County23.7Kent County: 23.1 %Kent County23.1Wayne County: 23 %Wayne County23Allegan County: 22.9 %Allegan County22.9Wexford County: 22.7 %Wexford County22.7Osceola County: 22.6 %Osceola County22.6Ottawa County: 22.6 %Ottawa County22.6Calhoun County: 22.5 %Calhoun County22.5Van Buren County: 22.5 %Van Buren County22.5Muskegon County: 22 %Muskegon County22Hillsdale County: 22 %Hillsdale County22Missaukee County: 21.9 %Missaukee County21.9Newaygo County: 21.8 %Newaygo County21.8Genesee County: 21.7 %Genesee County21.7Barry County: 21.7 %Barry County21.7Clinton County: 21.4 %Clinton County21.4Kalamazoo County: 21.3 %Kalamazoo County21.3Oceana County: 21.2 %Oceana County21.2Midland County: 21 %Midland County21Ionia County: 20.9 %Ionia County20.9Berrien County: 20.9 %Berrien County20.9Eaton County: 20.7 %Eaton County20.7Sanilac County: 20.7 %Sanilac County20.7Monroe County: 20.6 %Monroe County20.6Jackson County: 20.6 %Jackson County20.6Saginaw County: 20.6 %Saginaw County20.6Montcalm County: 20.5 %Montcalm County20.5Cass County: 20.5 %Cass County20.5Lenawee County: 20.5 %Lenawee County20.5Shiawassee County: 20.5 %Shiawassee County20.5Tuscola County: 20.4 %Tuscola County20.4Otsego County: 20.4 %Otsego County20.4Livingston County: 20.2 %Livingston County20.2Macomb County: 20.1 %Macomb County20.1Lapeer County: 19.9 %Lapeer County19.9Oakland County: 19.8 %Oakland County19.8St. Clair County: 19.8 %St. Clair County19.8Clare County: 19.7 %Clare County19.7Dickinson County: 19.6 %Dickinson County19.6St. Joseph County: 23.8 %St. Joseph County23.8Branch County: 23.7 %Branch County23.7Kent County: 23.1 %Kent County23.1Wayne County: 23 %Wayne County23Allegan County: 22.9 %Allegan County22.9Wexford County: 22.7 %Wexford County22.7Osceola County: 22.6 %Osceola County22.6Ottawa County: 22.6 %Ottawa County22.6Calhoun County: 22.5 %Calhoun County22.5Van Buren County: 22.5 %Van Buren County22.5Muskegon County: 22 %Muskegon County22Hillsdale County: 22 %Hillsdale County22Missaukee County: 21.9 %Missaukee County21.9Newaygo County: 21.8 %Newaygo County21.8Genesee County: 21.7 %Genesee County21.7Barry County: 21.7 %Barry County21.7Clinton County: 21.4 %Clinton County21.4Kalamazoo County: 21.3 %Kalamazoo County21.3Oceana County: 21.2 %Oceana County21.2Midland County: 21 %Midland County21Ionia County: 20.9 %Ionia County20.9Berrien County: 20.9 %Berrien County20.9Eaton County: 20.7 %Eaton County20.7Sanilac County: 20.7 %Sanilac County20.7Monroe County: 20.6 %Monroe County20.6Jackson County: 20.6 %Jackson County20.6Saginaw County: 20.6 %Saginaw County20.6Montcalm County: 20.5 %Montcalm County20.5Cass County: 20.5 %Cass County20.5Lenawee County: 20.5 %Lenawee County20.5Shiawassee County: 20.5 %Shiawassee County20.5Tuscola County: 20.4 %Tuscola County20.4Otsego County: 20.4 %Otsego County20.4Livingston County: 20.2 %Livingston County20.2Macomb County: 20.1 %Macomb County20.1Lapeer County: 19.9 %Lapeer County19.9Oakland County: 19.8 %Oakland County19.8St. Clair County: 19.8 %St. Clair County19.8Clare County: 19.7 %Clare County19.7Dickinson County: 19.6 %Dickinson County19.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1St. Joseph County23.8-0.3 pts
2Branch County23.7-0.4 pts
3Kent County23.1-0.2 pts
4Wayne County23-0.1 pts
5Allegan County22.9-0.4 pts
6Wexford County22.7-0.2 pts
7Osceola County22.6-0.3 pts
8Ottawa County22.6-0.4 pts
9Calhoun County22.5-0.2 pts
10Van Buren County22.5-0.2 pts
11Muskegon County22-0.2 pts
12Hillsdale County22-0 pts
13Missaukee County21.9-0.4 pts
14Newaygo County21.8-0.3 pts
15Genesee County21.7-0.3 pts
16Barry County21.7-0.2 pts
17Clinton County21.4-0.4 pts
18Kalamazoo County21.3-0.3 pts
19Oceana County21.2-0.5 pts
20Midland County21-0.1 pts
21Ionia County20.9-0.2 pts
22Berrien County20.9-0.3 pts
23Eaton County20.7-0.1 pts
24Sanilac County20.7-0.4 pts
25Monroe County20.6-0.2 pts
26Jackson County20.6-0.3 pts
27Saginaw County20.6-0.5 pts
28Montcalm County20.5-0.5 pts
29Cass County20.5-0.2 pts
30Lenawee County20.5-0 pts
31Shiawassee County20.5-0.1 pts
32Tuscola County20.4-0.3 pts
33Otsego County20.4-0.1 pts
34Livingston County20.2-0.3 pts
35Macomb County20.1-0.2 pts
36Lapeer County19.9-0.4 pts
37Oakland County19.8-0.2 pts
38St. Clair County19.8-0.2 pts
39Clare County19.7-0 pts
40Dickinson County19.6-0.1 pts
41Houghton County19.5-0.1 pts
42Ingham County19.5-0.2 pts
43Mecosta County19.5-0.1 pts
44Kalkaska County19.5-0.4 pts
45Bay County19.1-0.2 pts
46Isabella County19.1-0.3 pts
47Gladwin County19.10 pts
48Grand Traverse County18.9-0.3 pts
49Oscoda County18.9+0.5 pts
50Mason County18.7-0.7 pts
51Delta County18.7-0.2 pts
52Alpena County18.60 pts
53Huron County18.4-0.2 pts
54Chippewa County18.4-0.3 pts
55Arenac County18.3-0.1 pts
56Crawford County17.8-0.3 pts
57Ogemaw County17.8-0.2 pts
58Schoolcraft County17.7-0 pts
59Baraga County17.6-0.3 pts
60Washtenaw County17.6-0.3 pts
61Menominee County17.5-0.3 pts
62Marquette County17.5-0.3 pts
63Emmet County17.4-0.2 pts
64Charlevoix County17.4-0.1 pts
65Iosco County17.1+0.1 pts
66Iron County17.1-0.1 pts
67Gratiot County17-1.5 pts
68Benzie County16.6-0.1 pts
69Antrim County16.5-0.2 pts
70Manistee County16.4-0 pts
71Gogebic County16.3-0.1 pts
72Cheboygan County16.1-0.4 pts
73Luce County15.7-0.6 pts
74Leelanau County15.6-0.3 pts
75Mackinac County15.4-0.5 pts
76Presque Isle County15.2-0.1 pts
77Montmorency County15.2-0.1 pts
78Keweenaw County14.9-0 pts
79Lake County14.9-0.4 pts
80Alger County14.7-0.5 pts
81Roscommon County13.9-0.2 pts
82Alcona County13-0 pts
83Ontonagon County12-0 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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_michigan_by_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2023.
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 23.8% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Ontonagon County, with 12% in 2023.

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