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 2016, at 24.9%. Ontonagon County had the lowest, at 12.4%. The median was 20.5% and the figure for Michigan was 22.1%. Source: the U.S. Census Bureau.

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Highest24.9St. Joseph County
Lowest12.4Ontonagon County
Median20.583 counties
Michigan22.1History

Map of counties, 2016

Alcona County: 13 %Alger County: 15.5 %Allegan County: 24.8 %Alpena County: 19.1 %Antrim County: 18.5 %Arenac County: 17.7 %Baraga County: 18.8 %Barry County: 22.9 %Bay County: 20.6 %Benzie County: 18.4 %Berrien County: 22.1 %Branch County: 24.2 %Calhoun County: 23.3 %Cass County: 21.4 %Charlevoix County: 19.9 %Cheboygan County: 17.9 %Chippewa County: 19 %Clare County: 20 %Clinton County: 23.2 %Crawford County: 18.9 %Delta County: 20.2 %Dickinson County: 19.9 %Eaton County: 21.8 %Emmet County: 19.8 %Genesee County: 23 %Gladwin County: 19.1 %Gogebic County: 15.7 %Grand Traverse County: 20.4 %Gratiot County: 21.8 %Hillsdale County: 22.5 %Houghton County: 20.1 %Huron County: 19.2 %Ingham County: 20.3 %Ionia County: 22.6 %Iosco County: 17.1 %Iron County: 16.7 %Isabella County: 18.4 %Jackson County: 21.8 %Kalamazoo County: 22.2 %Kalkaska County: 21 %Kent County: 24.7 %Keweenaw County: 16.3 %Lake County: 16 %Lapeer County: 21.8 %Leelanau County: 17 %Lenawee County: 21.5 %Livingston County: 22.6 %Luce County: 18.7 %Mackinac County: 16.6 %Macomb County: 21.3 %Manistee County: 17.5 %Marquette County: 18.4 %Mason County: 20.5 %Mecosta County: 19.7 %Menominee County: 19.2 %Midland County: 21.9 %Missaukee County: 23.4 %Monroe County: 21.9 %Montcalm County: 22.4 %Montmorency County: 15 %Muskegon County: 23.3 %Newaygo County: 22.7 %Oakland County: 21.5 %Oceana County: 23.7 %Ogemaw County: 18.5 %Ontonagon County: 12.4 %Osceola County: 23.6 %Oscoda County: 18 %Otsego County: 21.3 %Ottawa County: 24.5 %Presque Isle County: 16.1 %Roscommon County: 14.7 %Saginaw County: 21.9 %St. Clair County: 21.4 %St. Joseph County: 24.9 %Sanilac County: 22 %Schoolcraft County: 16.9 %Shiawassee County: 21.7 %Tuscola County: 21.5 %Van Buren County: 23.8 %Washtenaw County: 19 %Wayne County: 23.7 %Wexford County: 23.5 %
  • Under 17
  • 17 to 19
  • 19 to 20
  • 20 to 22
  • 22 to 23
  • 23 and over
%, 2016. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2016

St. Joseph County: 24.9 %St. Joseph County24.9Allegan County: 24.8 %Allegan County24.8Kent County: 24.7 %Kent County24.7Ottawa County: 24.5 %Ottawa County24.5Branch County: 24.2 %Branch County24.2Van Buren County: 23.8 %Van Buren County23.8Wayne County: 23.7 %Wayne County23.7Oceana County: 23.7 %Oceana County23.7Osceola County: 23.6 %Osceola County23.6Wexford County: 23.5 %Wexford County23.5Missaukee County: 23.4 %Missaukee County23.4Calhoun County: 23.3 %Calhoun County23.3Muskegon County: 23.3 %Muskegon County23.3Clinton County: 23.2 %Clinton County23.2Genesee County: 23 %Genesee County23Barry County: 22.9 %Barry County22.9Newaygo County: 22.7 %Newaygo County22.7Ionia County: 22.6 %Ionia County22.6Livingston County: 22.6 %Livingston County22.6Hillsdale County: 22.5 %Hillsdale County22.5Montcalm County: 22.4 %Montcalm County22.4Kalamazoo County: 22.2 %Kalamazoo County22.2Berrien County: 22.1 %Berrien County22.1Sanilac County: 22 %Sanilac County22Monroe County: 21.9 %Monroe County21.9Midland County: 21.9 %Midland County21.9Saginaw County: 21.9 %Saginaw County21.9Gratiot County: 21.8 %Gratiot County21.8Eaton County: 21.8 %Eaton County21.8Lapeer County: 21.8 %Lapeer County21.8Jackson County: 21.8 %Jackson County21.8Shiawassee County: 21.7 %Shiawassee County21.7Lenawee County: 21.5 %Lenawee County21.5Tuscola County: 21.5 %Tuscola County21.5Oakland County: 21.5 %Oakland County21.5Cass County: 21.4 %Cass County21.4St. Clair County: 21.4 %St. Clair County21.4Macomb County: 21.3 %Macomb County21.3Otsego County: 21.3 %Otsego County21.3Kalkaska County: 21 %Kalkaska County21St. Joseph County: 24.9 %St. Joseph County24.9Allegan County: 24.8 %Allegan County24.8Kent County: 24.7 %Kent County24.7Ottawa County: 24.5 %Ottawa County24.5Branch County: 24.2 %Branch County24.2Van Buren County: 23.8 %Van Buren County23.8Wayne County: 23.7 %Wayne County23.7Oceana County: 23.7 %Oceana County23.7Osceola County: 23.6 %Osceola County23.6Wexford County: 23.5 %Wexford County23.5Missaukee County: 23.4 %Missaukee County23.4Calhoun County: 23.3 %Calhoun County23.3Muskegon County: 23.3 %Muskegon County23.3Clinton County: 23.2 %Clinton County23.2Genesee County: 23 %Genesee County23Barry County: 22.9 %Barry County22.9Newaygo County: 22.7 %Newaygo County22.7Ionia County: 22.6 %Ionia County22.6Livingston County: 22.6 %Livingston County22.6Hillsdale County: 22.5 %Hillsdale County22.5Montcalm County: 22.4 %Montcalm County22.4Kalamazoo County: 22.2 %Kalamazoo County22.2Berrien County: 22.1 %Berrien County22.1Sanilac County: 22 %Sanilac County22Monroe County: 21.9 %Monroe County21.9Midland County: 21.9 %Midland County21.9Saginaw County: 21.9 %Saginaw County21.9Gratiot County: 21.8 %Gratiot County21.8Eaton County: 21.8 %Eaton County21.8Lapeer County: 21.8 %Lapeer County21.8Jackson County: 21.8 %Jackson County21.8Shiawassee County: 21.7 %Shiawassee County21.7Lenawee County: 21.5 %Lenawee County21.5Tuscola County: 21.5 %Tuscola County21.5Oakland County: 21.5 %Oakland County21.5Cass County: 21.4 %Cass County21.4St. Clair County: 21.4 %St. Clair County21.4Macomb County: 21.3 %Macomb County21.3Otsego County: 21.3 %Otsego County21.3Kalkaska County: 21 %Kalkaska County21
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1St. Joseph County24.9-0.2 pts
2Allegan County24.8-0.2 pts
3Kent County24.7-0.2 pts
4Ottawa County24.5-0.2 pts
5Branch County24.20 pts
6Van Buren County23.8-0.2 pts
7Wayne County23.7-0.1 pts
8Oceana County23.7-0.1 pts
9Osceola County23.6-0.1 pts
10Wexford County23.5+0.2 pts
11Missaukee County23.4+0.3 pts
12Calhoun County23.3-0.1 pts
13Muskegon County23.3-0.1 pts
14Clinton County23.2-0.1 pts
15Genesee County23-0.2 pts
16Barry County22.9-0.2 pts
17Newaygo County22.7-0.4 pts
18Ionia County22.6-0.2 pts
19Livingston County22.6-0.4 pts
20Hillsdale County22.5-0.1 pts
21Montcalm County22.4-0.2 pts
22Kalamazoo County22.2-0.1 pts
23Berrien County22.1-0.2 pts
24Sanilac County22-0.1 pts
25Monroe County21.9-0.4 pts
26Midland County21.9-0.1 pts
27Saginaw County21.9-0.1 pts
28Gratiot County21.8+0.2 pts
29Eaton County21.8-0.1 pts
30Lapeer County21.8-0.3 pts
31Jackson County21.8-0.2 pts
32Shiawassee County21.7-0.3 pts
33Lenawee County21.5-0.1 pts
34Tuscola County21.5-0.3 pts
35Oakland County21.5-0.3 pts
36Cass County21.4-0.4 pts
37St. Clair County21.4-0.3 pts
38Macomb County21.3-0.2 pts
39Otsego County21.3-0 pts
40Kalkaska County21+0.1 pts
41Bay County20.6-0.2 pts
42Mason County20.5-0.2 pts
43Grand Traverse County20.4-0.2 pts
44Ingham County20.3-0.1 pts
45Delta County20.2-0.1 pts
46Houghton County20.10 pts
47Clare County200 pts
48Dickinson County19.9-0 pts
49Charlevoix County19.9-0.1 pts
50Emmet County19.8-0.2 pts
51Mecosta County19.7+0.1 pts
52Huron County19.2-0.2 pts
53Menominee County19.2-0.3 pts
54Alpena County19.1-0.2 pts
55Gladwin County19.1-0 pts
56Washtenaw County19-0.2 pts
57Chippewa County19-0 pts
58Crawford County18.9+0.2 pts
59Baraga County18.8-0.2 pts
60Luce County18.7+0.6 pts
61Antrim County18.5-0.3 pts
62Ogemaw County18.5-0.1 pts
63Isabella County18.4+0.1 pts
63Marquette County18.4+0.2 pts
65Benzie County18.4-0.1 pts
66Oscoda County180 pts
67Cheboygan County17.9-0.2 pts
68Arenac County17.7-0.4 pts
69Manistee County17.5-0.2 pts
70Iosco County17.1+0.1 pts
71Leelanau County17-0.4 pts
72Schoolcraft County16.9-0.7 pts
73Iron County16.7+0.3 pts
74Mackinac County16.6-0.4 pts
75Keweenaw County16.3+0.2 pts
76Presque Isle County16.1-0.3 pts
77Lake County16-0.3 pts
78Gogebic County15.7+0.2 pts
79Alger County15.5-0 pts
80Montmorency County150 pts
81Roscommon County14.7-0 pts
82Alcona County13-0.3 pts
83Ontonagon County12.4-0.6 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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_michigan_by_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2016.
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 24.9% in 2016, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Ontonagon County, with 12.4% in 2016.

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