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 2017, at 24.8%. Ontonagon County had the lowest, at 12.4%. The median was 20.4% and the figure for Michigan was 21.9%. Source: the U.S. Census Bureau.

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Highest24.8St. Joseph County
Lowest12.4Ontonagon County
Median20.483 counties
Michigan21.9History

Map of counties, 2017

Alcona County: 13 %Alger County: 15.5 %Allegan County: 24.7 %Alpena County: 19 %Antrim County: 18.3 %Arenac County: 17.7 %Baraga County: 18.7 %Barry County: 22.9 %Bay County: 20.5 %Benzie County: 18.2 %Berrien County: 22 %Branch County: 24.2 %Calhoun County: 23.2 %Cass County: 21.6 %Charlevoix County: 19.5 %Cheboygan County: 17.9 %Chippewa County: 18.8 %Clare County: 20.1 %Clinton County: 23.1 %Crawford County: 18.8 %Delta County: 20 %Dickinson County: 20 %Eaton County: 21.6 %Emmet County: 19.4 %Genesee County: 22.8 %Gladwin County: 19 %Gogebic County: 15.7 %Grand Traverse County: 20.4 %Gratiot County: 21.6 %Hillsdale County: 22.5 %Houghton County: 20 %Huron County: 19.3 %Ingham County: 20.2 %Ionia County: 22.2 %Iosco County: 17 %Iron County: 16.6 %Isabella County: 18.5 %Jackson County: 21.7 %Kalamazoo County: 22.2 %Kalkaska County: 20.7 %Kent County: 24.4 %Keweenaw County: 15.3 %Lake County: 15.7 %Lapeer County: 21.5 %Leelanau County: 16.8 %Lenawee County: 21.4 %Livingston County: 22.3 %Luce County: 19 %Mackinac County: 16.3 %Macomb County: 21.1 %Manistee County: 17.5 %Marquette County: 18.4 %Mason County: 20.1 %Mecosta County: 20 %Menominee County: 18.8 %Midland County: 22 %Missaukee County: 23.3 %Monroe County: 21.6 %Montcalm County: 22.3 %Montmorency County: 15.2 %Muskegon County: 23.1 %Newaygo County: 22.7 %Oakland County: 21.2 %Oceana County: 23.5 %Ogemaw County: 18.7 %Ontonagon County: 12.4 %Osceola County: 23.4 %Oscoda County: 18.4 %Otsego County: 21 %Ottawa County: 24.3 %Presque Isle County: 16.1 %Roscommon County: 14.6 %Saginaw County: 21.9 %St. Clair County: 21.1 %St. Joseph County: 24.8 %Sanilac County: 21.9 %Schoolcraft County: 16.8 %Shiawassee County: 21.4 %Tuscola County: 21.4 %Van Buren County: 23.6 %Washtenaw County: 18.7 %Wayne County: 23.6 %Wexford County: 23.4 %
  • Under 17
  • 17 to 19
  • 19 to 20
  • 20 to 22
  • 22 to 23
  • 23 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2017

St. Joseph County: 24.8 %St. Joseph County24.8Allegan County: 24.7 %Allegan County24.7Kent County: 24.4 %Kent County24.4Ottawa County: 24.3 %Ottawa County24.3Branch County: 24.2 %Branch County24.2Wayne County: 23.6 %Wayne County23.6Van Buren County: 23.6 %Van Buren County23.6Oceana County: 23.5 %Oceana County23.5Osceola County: 23.4 %Osceola County23.4Wexford County: 23.4 %Wexford County23.4Missaukee County: 23.3 %Missaukee County23.3Calhoun County: 23.2 %Calhoun County23.2Clinton County: 23.1 %Clinton County23.1Muskegon County: 23.1 %Muskegon County23.1Barry County: 22.9 %Barry County22.9Genesee County: 22.8 %Genesee County22.8Newaygo County: 22.7 %Newaygo County22.7Hillsdale County: 22.5 %Hillsdale County22.5Livingston County: 22.3 %Livingston County22.3Montcalm County: 22.3 %Montcalm County22.3Ionia County: 22.2 %Ionia County22.2Kalamazoo County: 22.2 %Kalamazoo County22.2Midland County: 22 %Midland County22Berrien County: 22 %Berrien County22Saginaw County: 21.9 %Saginaw County21.9Sanilac County: 21.9 %Sanilac County21.9Jackson County: 21.7 %Jackson County21.7Gratiot County: 21.6 %Gratiot County21.6Eaton County: 21.6 %Eaton County21.6Cass County: 21.6 %Cass County21.6Monroe County: 21.6 %Monroe County21.6Lapeer County: 21.5 %Lapeer County21.5Shiawassee County: 21.4 %Shiawassee County21.4Lenawee County: 21.4 %Lenawee County21.4Tuscola County: 21.4 %Tuscola County21.4Oakland County: 21.2 %Oakland County21.2St. Clair County: 21.1 %St. Clair County21.1Macomb County: 21.1 %Macomb County21.1Otsego County: 21 %Otsego County21Kalkaska County: 20.7 %Kalkaska County20.7St. Joseph County: 24.8 %St. Joseph County24.8Allegan County: 24.7 %Allegan County24.7Kent County: 24.4 %Kent County24.4Ottawa County: 24.3 %Ottawa County24.3Branch County: 24.2 %Branch County24.2Wayne County: 23.6 %Wayne County23.6Van Buren County: 23.6 %Van Buren County23.6Oceana County: 23.5 %Oceana County23.5Osceola County: 23.4 %Osceola County23.4Wexford County: 23.4 %Wexford County23.4Missaukee County: 23.3 %Missaukee County23.3Calhoun County: 23.2 %Calhoun County23.2Clinton County: 23.1 %Clinton County23.1Muskegon County: 23.1 %Muskegon County23.1Barry County: 22.9 %Barry County22.9Genesee County: 22.8 %Genesee County22.8Newaygo County: 22.7 %Newaygo County22.7Hillsdale County: 22.5 %Hillsdale County22.5Livingston County: 22.3 %Livingston County22.3Montcalm County: 22.3 %Montcalm County22.3Ionia County: 22.2 %Ionia County22.2Kalamazoo County: 22.2 %Kalamazoo County22.2Midland County: 22 %Midland County22Berrien County: 22 %Berrien County22Saginaw County: 21.9 %Saginaw County21.9Sanilac County: 21.9 %Sanilac County21.9Jackson County: 21.7 %Jackson County21.7Gratiot County: 21.6 %Gratiot County21.6Eaton County: 21.6 %Eaton County21.6Cass County: 21.6 %Cass County21.6Monroe County: 21.6 %Monroe County21.6Lapeer County: 21.5 %Lapeer County21.5Shiawassee County: 21.4 %Shiawassee County21.4Lenawee County: 21.4 %Lenawee County21.4Tuscola County: 21.4 %Tuscola County21.4Oakland County: 21.2 %Oakland County21.2St. Clair County: 21.1 %St. Clair County21.1Macomb County: 21.1 %Macomb County21.1Otsego County: 21 %Otsego County21Kalkaska County: 20.7 %Kalkaska County20.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1St. Joseph County24.8-0.2 pts
2Allegan County24.7-0.1 pts
3Kent County24.4-0.3 pts
4Ottawa County24.3-0.2 pts
5Branch County24.2-0 pts
6Wayne County23.6-0.1 pts
7Van Buren County23.6-0.2 pts
8Oceana County23.5-0.2 pts
9Osceola County23.4-0.2 pts
10Wexford County23.4-0.1 pts
11Missaukee County23.3-0.1 pts
12Calhoun County23.2-0.1 pts
13Clinton County23.1-0.1 pts
14Muskegon County23.1-0.3 pts
15Barry County22.9-0 pts
16Genesee County22.8-0.2 pts
17Newaygo County22.70 pts
18Hillsdale County22.50 pts
19Livingston County22.3-0.3 pts
20Montcalm County22.3-0.1 pts
21Ionia County22.2-0.4 pts
22Kalamazoo County22.2-0 pts
23Midland County22+0.1 pts
24Berrien County22-0.1 pts
25Saginaw County21.9-0 pts
26Sanilac County21.9-0.1 pts
27Jackson County21.7-0.1 pts
28Gratiot County21.6-0.2 pts
29Eaton County21.6-0.2 pts
30Cass County21.6+0.2 pts
31Monroe County21.6-0.3 pts
32Lapeer County21.5-0.3 pts
33Shiawassee County21.4-0.3 pts
34Lenawee County21.4-0.2 pts
35Tuscola County21.4-0.2 pts
36Oakland County21.2-0.3 pts
37St. Clair County21.1-0.3 pts
38Macomb County21.1-0.2 pts
39Otsego County21-0.2 pts
40Kalkaska County20.7-0.3 pts
41Bay County20.5-0.1 pts
42Grand Traverse County20.40 pts
43Ingham County20.2-0.1 pts
44Mason County20.1-0.4 pts
45Clare County20.1+0.1 pts
46Houghton County20-0.1 pts
46Mecosta County20+0.2 pts
48Delta County20-0.2 pts
49Dickinson County200 pts
50Charlevoix County19.5-0.5 pts
51Emmet County19.4-0.4 pts
52Huron County19.3+0.1 pts
53Gladwin County19-0.1 pts
54Alpena County19-0.2 pts
55Luce County19+0.2 pts
56Crawford County18.8-0.1 pts
57Chippewa County18.8-0.2 pts
58Menominee County18.8-0.4 pts
59Washtenaw County18.7-0.3 pts
60Baraga County18.7-0.1 pts
61Ogemaw County18.7+0.2 pts
62Isabella County18.5+0.1 pts
63Marquette County18.40 pts
64Oscoda County18.4+0.4 pts
65Antrim County18.3-0.3 pts
66Benzie County18.2-0.2 pts
67Cheboygan County17.9-0.1 pts
68Arenac County17.70 pts
69Manistee County17.5-0.1 pts
70Iosco County17-0 pts
71Schoolcraft County16.8-0 pts
72Leelanau County16.8-0.2 pts
73Iron County16.6-0.1 pts
74Mackinac County16.3-0.2 pts
75Presque Isle County16.1-0.1 pts
76Lake County15.7-0.3 pts
77Gogebic County15.7-0.1 pts
78Alger County15.5+0.1 pts
79Keweenaw County15.3-1 pts
80Montmorency County15.2+0.2 pts
81Roscommon County14.6-0.1 pts
82Alcona County13-0 pts
83Ontonagon County12.40 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, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_michigan_by_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2017.
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 24.8% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Ontonagon County, with 12.4% in 2017.

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