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 2015, at 25.1%. Ontonagon County had the lowest, at 13%. The median was 20.7% and the figure for Michigan was 22.3%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest25.1St. Joseph County
Lowest13Ontonagon County
Median20.783 counties
Michigan22.3History

Map of counties, 2015

Alcona County: 13.3 %Alger County: 15.5 %Allegan County: 25 %Alpena County: 19.3 %Antrim County: 18.8 %Arenac County: 18.1 %Baraga County: 19.1 %Barry County: 23.1 %Bay County: 20.8 %Benzie County: 18.5 %Berrien County: 22.3 %Branch County: 24.2 %Calhoun County: 23.4 %Cass County: 21.8 %Charlevoix County: 20 %Cheboygan County: 18.1 %Chippewa County: 19 %Clare County: 20 %Clinton County: 23.4 %Crawford County: 18.8 %Delta County: 20.4 %Dickinson County: 19.9 %Eaton County: 21.9 %Emmet County: 20 %Genesee County: 23.2 %Gladwin County: 19.1 %Gogebic County: 15.5 %Grand Traverse County: 20.6 %Gratiot County: 21.7 %Hillsdale County: 22.6 %Houghton County: 20.1 %Huron County: 19.5 %Ingham County: 20.4 %Ionia County: 22.8 %Iosco County: 17 %Iron County: 16.4 %Isabella County: 18.3 %Jackson County: 21.9 %Kalamazoo County: 22.3 %Kalkaska County: 20.8 %Kent County: 24.9 %Keweenaw County: 16.1 %Lake County: 16.3 %Lapeer County: 22.1 %Leelanau County: 17.4 %Lenawee County: 21.7 %Livingston County: 23 %Luce County: 18.1 %Mackinac County: 17 %Macomb County: 21.5 %Manistee County: 17.8 %Marquette County: 18.2 %Mason County: 20.7 %Mecosta County: 19.7 %Menominee County: 19.5 %Midland County: 22 %Missaukee County: 23.1 %Monroe County: 22.3 %Montcalm County: 22.6 %Montmorency County: 15 %Muskegon County: 23.4 %Newaygo County: 23.1 %Oakland County: 21.8 %Oceana County: 23.8 %Ogemaw County: 18.6 %Ontonagon County: 13 %Osceola County: 23.8 %Oscoda County: 18 %Otsego County: 21.3 %Ottawa County: 24.7 %Presque Isle County: 16.5 %Roscommon County: 14.8 %Saginaw County: 22 %St. Clair County: 21.6 %St. Joseph County: 25.1 %Sanilac County: 22.1 %Schoolcraft County: 17.6 %Shiawassee County: 22 %Tuscola County: 21.8 %Van Buren County: 24 %Washtenaw County: 19.2 %Wayne County: 23.9 %Wexford County: 23.4 %
  • Under 18
  • 18 to 19
  • 19 to 21
  • 21 to 22
  • 22 to 23
  • 23 and over
%, 2015. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2015

St. Joseph County: 25.1 %St. Joseph County25.1Allegan County: 25 %Allegan County25Kent County: 24.9 %Kent County24.9Ottawa County: 24.7 %Ottawa County24.7Branch County: 24.2 %Branch County24.2Van Buren County: 24 %Van Buren County24Wayne County: 23.9 %Wayne County23.9Oceana County: 23.8 %Oceana County23.8Osceola County: 23.8 %Osceola County23.8Muskegon County: 23.4 %Muskegon County23.4Clinton County: 23.4 %Clinton County23.4Calhoun County: 23.4 %Calhoun County23.4Wexford County: 23.4 %Wexford County23.4Genesee County: 23.2 %Genesee County23.2Newaygo County: 23.1 %Newaygo County23.1Missaukee County: 23.1 %Missaukee County23.1Barry County: 23.1 %Barry County23.1Livingston County: 23 %Livingston County23Ionia County: 22.8 %Ionia County22.8Hillsdale County: 22.6 %Hillsdale County22.6Montcalm County: 22.6 %Montcalm County22.6Monroe County: 22.3 %Monroe County22.3Kalamazoo County: 22.3 %Kalamazoo County22.3Berrien County: 22.3 %Berrien County22.3Sanilac County: 22.1 %Sanilac County22.1Lapeer County: 22.1 %Lapeer County22.1Shiawassee County: 22 %Shiawassee County22Midland County: 22 %Midland County22Saginaw County: 22 %Saginaw County22Eaton County: 21.9 %Eaton County21.9Jackson County: 21.9 %Jackson County21.9Tuscola County: 21.8 %Tuscola County21.8Oakland County: 21.8 %Oakland County21.8Cass County: 21.8 %Cass County21.8Gratiot County: 21.7 %Gratiot County21.7Lenawee County: 21.7 %Lenawee County21.7St. Clair County: 21.6 %St. Clair County21.6Macomb County: 21.5 %Macomb County21.5Otsego County: 21.3 %Otsego County21.3Bay County: 20.8 %Bay County20.8St. Joseph County: 25.1 %St. Joseph County25.1Allegan County: 25 %Allegan County25Kent County: 24.9 %Kent County24.9Ottawa County: 24.7 %Ottawa County24.7Branch County: 24.2 %Branch County24.2Van Buren County: 24 %Van Buren County24Wayne County: 23.9 %Wayne County23.9Oceana County: 23.8 %Oceana County23.8Osceola County: 23.8 %Osceola County23.8Muskegon County: 23.4 %Muskegon County23.4Clinton County: 23.4 %Clinton County23.4Calhoun County: 23.4 %Calhoun County23.4Wexford County: 23.4 %Wexford County23.4Genesee County: 23.2 %Genesee County23.2Newaygo County: 23.1 %Newaygo County23.1Missaukee County: 23.1 %Missaukee County23.1Barry County: 23.1 %Barry County23.1Livingston County: 23 %Livingston County23Ionia County: 22.8 %Ionia County22.8Hillsdale County: 22.6 %Hillsdale County22.6Montcalm County: 22.6 %Montcalm County22.6Monroe County: 22.3 %Monroe County22.3Kalamazoo County: 22.3 %Kalamazoo County22.3Berrien County: 22.3 %Berrien County22.3Sanilac County: 22.1 %Sanilac County22.1Lapeer County: 22.1 %Lapeer County22.1Shiawassee County: 22 %Shiawassee County22Midland County: 22 %Midland County22Saginaw County: 22 %Saginaw County22Eaton County: 21.9 %Eaton County21.9Jackson County: 21.9 %Jackson County21.9Tuscola County: 21.8 %Tuscola County21.8Oakland County: 21.8 %Oakland County21.8Cass County: 21.8 %Cass County21.8Gratiot County: 21.7 %Gratiot County21.7Lenawee County: 21.7 %Lenawee County21.7St. Clair County: 21.6 %St. Clair County21.6Macomb County: 21.5 %Macomb County21.5Otsego County: 21.3 %Otsego County21.3Bay County: 20.8 %Bay County20.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1St. Joseph County25.1-0.1 pts
2Allegan County25-0.2 pts
3Kent County24.9-0.2 pts
4Ottawa County24.7-0.2 pts
5Branch County24.2-0.1 pts
6Van Buren County24-0.2 pts
7Wayne County23.9-0.1 pts
8Oceana County23.8-0.2 pts
9Osceola County23.8-0.2 pts
10Muskegon County23.4-0.2 pts
11Clinton County23.4-0.2 pts
12Calhoun County23.4-0.1 pts
13Wexford County23.4-0 pts
14Genesee County23.2-0.2 pts
15Newaygo County23.1-0.1 pts
16Missaukee County23.1-0.2 pts
17Barry County23.1-0.2 pts
18Livingston County23-0.4 pts
19Ionia County22.8-0.3 pts
20Hillsdale County22.6-0.1 pts
21Montcalm County22.6-0.2 pts
22Monroe County22.3-0.3 pts
23Kalamazoo County22.30 pts
24Berrien County22.3-0.2 pts
25Sanilac County22.1-0.3 pts
26Lapeer County22.1-0.2 pts
27Shiawassee County22-0.2 pts
28Midland County22-0 pts
29Saginaw County22-0.2 pts
30Eaton County21.9-0.1 pts
31Jackson County21.9-0.2 pts
32Tuscola County21.8-0.2 pts
33Oakland County21.8-0.3 pts
34Cass County21.8-0.1 pts
35Gratiot County21.7+0.2 pts
36Lenawee County21.7-0.2 pts
37St. Clair County21.6-0.3 pts
38Macomb County21.5-0.3 pts
39Otsego County21.3+0.1 pts
40Bay County20.8-0.2 pts
41Kalkaska County20.8-0.4 pts
42Mason County20.7+0.1 pts
43Grand Traverse County20.6-0.2 pts
44Ingham County20.4-0 pts
45Delta County20.40 pts
46Houghton County20.1-0.3 pts
47Emmet County20-0.5 pts
48Charlevoix County20-0.1 pts
49Clare County20-0.1 pts
50Dickinson County19.9-0.1 pts
51Mecosta County19.7-0.1 pts
52Menominee County19.5-0.1 pts
53Huron County19.5-0.1 pts
54Alpena County19.3-0.1 pts
55Washtenaw County19.2-0.4 pts
56Gladwin County19.1-0.3 pts
57Baraga County19.1-0.1 pts
58Chippewa County19-0.2 pts
59Antrim County18.8-0.3 pts
60Crawford County18.8+0.2 pts
61Ogemaw County18.6-0.3 pts
62Benzie County18.5-0.7 pts
63Isabella County18.30 pts
64Marquette County18.2-0.1 pts
65Luce County18.1+0.2 pts
66Arenac County18.1-0.1 pts
67Cheboygan County18.1-0.3 pts
68Oscoda County18-0.3 pts
69Manistee County17.80 pts
70Schoolcraft County17.6-0.8 pts
71Leelanau County17.4-0.4 pts
72Mackinac County17-0.2 pts
73Iosco County17-0.2 pts
74Presque Isle County16.5-0.2 pts
75Iron County16.4-0 pts
76Lake County16.3-0.3 pts
77Keweenaw County16.1-1.6 pts
78Gogebic County15.5-0.3 pts
79Alger County15.5-0.1 pts
80Montmorency County15-0.3 pts
81Roscommon County14.8-0 pts
82Alcona County13.3+0.1 pts
83Ontonagon County13-0.2 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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_michigan_by_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/michigan-counties?period=2015.
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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Michigan by population under 18 using official data, and cite the source.
rank_places {"indicator":"population_0_17_share","level":"province","within":"Michigan","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_0_17_share&level=province&within=Michigan&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population under 18?

St. Joseph County, with 25.1% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Ontonagon County, with 13% in 2015.

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