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 2019, at 24.4%. Ontonagon County had the lowest, at 12.2%. The median was 20.1% and the figure for Michigan was 21.6%. Source: the U.S. Census Bureau.

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Highest24.4St. Joseph County
Lowest12.2Ontonagon County
Median20.183 counties
Michigan21.6History

Map of counties, 2019

Alcona County: 12.9 %Alger County: 15.5 %Allegan County: 24.2 %Alpena County: 18.7 %Antrim County: 17.7 %Arenac County: 17.8 %Baraga County: 17.5 %Barry County: 22.7 %Bay County: 20 %Benzie County: 17.5 %Berrien County: 21.6 %Branch County: 24 %Calhoun County: 22.9 %Cass County: 21.4 %Charlevoix County: 18.7 %Cheboygan County: 17.5 %Chippewa County: 18.5 %Clare County: 20.2 %Clinton County: 22.8 %Crawford County: 18.3 %Delta County: 19.5 %Dickinson County: 20 %Eaton County: 21.4 %Emmet County: 18.6 %Genesee County: 22.3 %Gladwin County: 18.9 %Gogebic County: 16.7 %Grand Traverse County: 19.8 %Gratiot County: 21.7 %Hillsdale County: 22.1 %Houghton County: 20.1 %Huron County: 19 %Ingham County: 20 %Ionia County: 21.7 %Iosco County: 17.1 %Iron County: 16.9 %Isabella County: 18.9 %Jackson County: 21.2 %Kalamazoo County: 22 %Kalkaska County: 20.2 %Kent County: 23.8 %Keweenaw County: 14.7 %Lake County: 15.9 %Lapeer County: 20.9 %Leelanau County: 16.5 %Lenawee County: 21 %Livingston County: 21.6 %Luce County: 18.9 %Mackinac County: 16.4 %Macomb County: 20.6 %Manistee County: 16.9 %Marquette County: 18.2 %Mason County: 20 %Mecosta County: 20.1 %Menominee County: 18.5 %Midland County: 21.7 %Missaukee County: 22.9 %Monroe County: 21.3 %Montcalm County: 21.5 %Montmorency County: 15.3 %Muskegon County: 22.6 %Newaygo County: 22.5 %Oakland County: 20.7 %Oceana County: 22.9 %Ogemaw County: 18.6 %Ontonagon County: 12.2 %Osceola County: 23.3 %Oscoda County: 17.8 %Otsego County: 20.4 %Ottawa County: 23.9 %Presque Isle County: 15.4 %Roscommon County: 14.4 %Saginaw County: 21.9 %St. Clair County: 20.6 %St. Joseph County: 24.4 %Sanilac County: 21.6 %Schoolcraft County: 17.3 %Shiawassee County: 21 %Tuscola County: 21.3 %Van Buren County: 23.1 %Washtenaw County: 18.5 %Wayne County: 23.4 %Wexford County: 23.1 %
  • Under 17
  • 17 to 19
  • 19 to 20
  • 20 to 21
  • 21 to 23
  • 23 and over
%, 2019. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2019

St. Joseph County: 24.4 %St. Joseph County24.4Allegan County: 24.2 %Allegan County24.2Branch County: 24 %Branch County24Ottawa County: 23.9 %Ottawa County23.9Kent County: 23.8 %Kent County23.8Wayne County: 23.4 %Wayne County23.4Osceola County: 23.3 %Osceola County23.3Van Buren County: 23.1 %Van Buren County23.1Wexford County: 23.1 %Wexford County23.1Missaukee County: 22.9 %Missaukee County22.9Oceana County: 22.9 %Oceana County22.9Calhoun County: 22.9 %Calhoun County22.9Clinton County: 22.8 %Clinton County22.8Barry County: 22.7 %Barry County22.7Muskegon County: 22.6 %Muskegon County22.6Newaygo County: 22.5 %Newaygo County22.5Genesee County: 22.3 %Genesee County22.3Hillsdale County: 22.1 %Hillsdale County22.1Kalamazoo County: 22 %Kalamazoo County22Saginaw County: 21.9 %Saginaw County21.9Midland County: 21.7 %Midland County21.7Ionia County: 21.7 %Ionia County21.7Gratiot County: 21.7 %Gratiot County21.7Berrien County: 21.6 %Berrien County21.6Livingston County: 21.6 %Livingston County21.6Sanilac County: 21.6 %Sanilac County21.6Montcalm County: 21.5 %Montcalm County21.5Cass County: 21.4 %Cass County21.4Eaton County: 21.4 %Eaton County21.4Tuscola County: 21.3 %Tuscola County21.3Monroe County: 21.3 %Monroe County21.3Jackson County: 21.2 %Jackson County21.2Lenawee County: 21 %Lenawee County21Shiawassee County: 21 %Shiawassee County21Lapeer County: 20.9 %Lapeer County20.9Oakland County: 20.7 %Oakland County20.7St. Clair County: 20.6 %St. Clair County20.6Macomb County: 20.6 %Macomb County20.6Otsego County: 20.4 %Otsego County20.4Kalkaska County: 20.2 %Kalkaska County20.2St. Joseph County: 24.4 %St. Joseph County24.4Allegan County: 24.2 %Allegan County24.2Branch County: 24 %Branch County24Ottawa County: 23.9 %Ottawa County23.9Kent County: 23.8 %Kent County23.8Wayne County: 23.4 %Wayne County23.4Osceola County: 23.3 %Osceola County23.3Van Buren County: 23.1 %Van Buren County23.1Wexford County: 23.1 %Wexford County23.1Missaukee County: 22.9 %Missaukee County22.9Oceana County: 22.9 %Oceana County22.9Calhoun County: 22.9 %Calhoun County22.9Clinton County: 22.8 %Clinton County22.8Barry County: 22.7 %Barry County22.7Muskegon County: 22.6 %Muskegon County22.6Newaygo County: 22.5 %Newaygo County22.5Genesee County: 22.3 %Genesee County22.3Hillsdale County: 22.1 %Hillsdale County22.1Kalamazoo County: 22 %Kalamazoo County22Saginaw County: 21.9 %Saginaw County21.9Midland County: 21.7 %Midland County21.7Ionia County: 21.7 %Ionia County21.7Gratiot County: 21.7 %Gratiot County21.7Berrien County: 21.6 %Berrien County21.6Livingston County: 21.6 %Livingston County21.6Sanilac County: 21.6 %Sanilac County21.6Montcalm County: 21.5 %Montcalm County21.5Cass County: 21.4 %Cass County21.4Eaton County: 21.4 %Eaton County21.4Tuscola County: 21.3 %Tuscola County21.3Monroe County: 21.3 %Monroe County21.3Jackson County: 21.2 %Jackson County21.2Lenawee County: 21 %Lenawee County21Shiawassee County: 21 %Shiawassee County21Lapeer County: 20.9 %Lapeer County20.9Oakland County: 20.7 %Oakland County20.7St. Clair County: 20.6 %St. Clair County20.6Macomb County: 20.6 %Macomb County20.6Otsego County: 20.4 %Otsego County20.4Kalkaska County: 20.2 %Kalkaska County20.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1St. Joseph County24.4-0.2 pts
2Allegan County24.2-0.2 pts
3Branch County24-0 pts
4Ottawa County23.9-0.2 pts
5Kent County23.8-0.3 pts
6Wayne County23.4-0.1 pts
7Osceola County23.30 pts
8Van Buren County23.1-0.2 pts
9Wexford County23.1-0.1 pts
10Missaukee County22.9-0.2 pts
11Oceana County22.9-0.2 pts
12Calhoun County22.9-0.2 pts
13Clinton County22.8-0.2 pts
14Barry County22.7-0.1 pts
15Muskegon County22.6-0.2 pts
16Newaygo County22.5-0.2 pts
17Genesee County22.3-0.2 pts
18Hillsdale County22.1-0.2 pts
19Kalamazoo County22-0.1 pts
20Saginaw County21.9+0.1 pts
21Midland County21.7-0.1 pts
22Ionia County21.7-0.2 pts
23Gratiot County21.7-0.1 pts
24Berrien County21.6-0.2 pts
25Livingston County21.6-0.3 pts
26Sanilac County21.6-0.1 pts
27Montcalm County21.5-0.4 pts
28Cass County21.4-0.1 pts
29Eaton County21.4-0 pts
30Tuscola County21.3-0.1 pts
31Monroe County21.3-0.2 pts
32Jackson County21.2-0.2 pts
33Lenawee County21-0.1 pts
34Shiawassee County21-0.2 pts
35Lapeer County20.9-0.2 pts
36Oakland County20.7-0.3 pts
37St. Clair County20.6-0.2 pts
38Macomb County20.6-0.2 pts
39Otsego County20.4-0.4 pts
40Kalkaska County20.2-0.3 pts
41Clare County20.20 pts
42Mecosta County20.1+0.2 pts
43Houghton County20.1+0.2 pts
44Ingham County20-0.1 pts
45Mason County20-0.2 pts
46Bay County20-0.3 pts
47Dickinson County20-0.1 pts
48Grand Traverse County19.8-0.4 pts
49Delta County19.5-0.3 pts
50Huron County19-0.3 pts
51Isabella County18.9+0.2 pts
52Gladwin County18.9-0 pts
53Luce County18.9-0.6 pts
54Alpena County18.7-0.1 pts
55Charlevoix County18.7-0.3 pts
56Ogemaw County18.6+0.1 pts
57Emmet County18.6-0.4 pts
58Washtenaw County18.5-0.1 pts
59Chippewa County18.5-0.2 pts
60Menominee County18.5-0.3 pts
61Crawford County18.3-0.3 pts
62Marquette County18.2-0.2 pts
63Oscoda County17.8-0 pts
64Arenac County17.8+0.1 pts
65Antrim County17.7-0.2 pts
66Benzie County17.5-0.5 pts
67Cheboygan County17.5-0.2 pts
68Baraga County17.5-0.6 pts
69Schoolcraft County17.3+0.4 pts
70Iosco County17.1+0.2 pts
71Manistee County16.9-0.3 pts
72Iron County16.90 pts
73Gogebic County16.7+1 pts
74Leelanau County16.5-0.1 pts
75Mackinac County16.4+0.2 pts
76Lake County15.90 pts
77Alger County15.5+0.1 pts
78Presque Isle County15.4-0.6 pts
79Montmorency County15.3+0.2 pts
80Keweenaw County14.7-0 pts
81Roscommon County14.40 pts
82Alcona County12.9-0.1 pts
83Ontonagon County12.2-0.1 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, 2019) [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, 2019. 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=2019. 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, 2019. 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=2019.

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, 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_michigan_by_2019,
  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, 2019}},
  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=2019. 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, 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2019.
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 24.4% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Ontonagon County, with 12.2% in 2019.

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