Data / Rankings / Population under 18 / Counties in Minnesota

Counties in Minnesota by population under 18

Mahnomen County had the highest population under 18 of 87 counties in 2018, at 29.8%. Cook County had the lowest, at 16.2%. The median was 23.2% and the figure for Minnesota was 23.3%. Source: the U.S. Census Bureau.

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Highest29.8Mahnomen County
Lowest16.2Cook County
Median23.287 counties
Minnesota23.3History

Map of counties, 2018

Aitkin County: 17 %Anoka County: 24.3 %Becker County: 24.3 %Beltrami County: 24.9 %Benton County: 25.1 %Big Stone County: 21.2 %Blue Earth County: 20.3 %Brown County: 21.5 %Carlton County: 22.5 %Carver County: 27.6 %Cass County: 21.3 %Chippewa County: 23.4 %Chisago County: 23.1 %Clay County: 25 %Clearwater County: 24.2 %Cook County: 16.2 %Cottonwood County: 23.6 %Crow Wing County: 21.8 %Dakota County: 24.6 %Dodge County: 26.4 %Douglas County: 21.6 %Faribault County: 21.9 %Fillmore County: 24.2 %Freeborn County: 22.2 %Goodhue County: 22.5 %Grant County: 22.8 %Hennepin County: 21.7 %Houston County: 22.2 %Hubbard County: 21.9 %Isanti County: 23.9 %Itasca County: 21.1 %Jackson County: 22.5 %Kanabec County: 21.9 %Kandiyohi County: 24.8 %Kittson County: 21.2 %Koochiching County: 19 %Lac qui Parle County: 21.2 %Lake County: 18.7 %Lake of the Woods County: 18.3 %Le Sueur County: 24.2 %Lincoln County: 23.6 %Lyon County: 25.4 %McLeod County: 22.8 %Mahnomen County: 29.8 %Marshall County: 23.3 %Martin County: 21.7 %Meeker County: 23.9 %Mille Lacs County: 23.9 %Morrison County: 23.6 %Mower County: 25.3 %Murray County: 21.9 %Nicollet County: 22.9 %Nobles County: 27.5 %Norman County: 23 %Olmsted County: 24 %Otter Tail County: 21.7 %Pennington County: 22.7 %Pine County: 20.4 %Pipestone County: 24.9 %Polk County: 24.2 %Pope County: 21.3 %Ramsey County: 23 %Red Lake County: 24.7 %Redwood County: 24.9 %Renville County: 22.8 %Rice County: 22.3 %Rock County: 25.8 %Roseau County: 24.2 %St. Louis County: 19.2 %Scott County: 27.7 %Sherburne County: 26.7 %Sibley County: 23.7 %Stearns County: 23.4 %Steele County: 25.1 %Stevens County: 22.7 %Swift County: 23.2 %Todd County: 24.9 %Traverse County: 21.5 %Wabasha County: 21.5 %Wadena County: 24.4 %Waseca County: 23.1 %Washington County: 24.9 %Watonwan County: 24.9 %Wilkin County: 23.4 %Winona County: 18.8 %Wright County: 28.4 %Yellow Medicine County: 23.3 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 to 25
  • 25 and over
%, 2018. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2018

Mahnomen County: 29.8 %Mahnomen County29.8Wright County: 28.4 %Wright County28.4Scott County: 27.7 %Scott County27.7Carver County: 27.6 %Carver County27.6Nobles County: 27.5 %Nobles County27.5Sherburne County: 26.7 %Sherburne County26.7Dodge County: 26.4 %Dodge County26.4Rock County: 25.8 %Rock County25.8Lyon County: 25.4 %Lyon County25.4Mower County: 25.3 %Mower County25.3Benton County: 25.1 %Benton County25.1Steele County: 25.1 %Steele County25.1Clay County: 25 %Clay County25Watonwan County: 24.9 %Watonwan County24.9Redwood County: 24.9 %Redwood County24.9Todd County: 24.9 %Todd County24.9Beltrami County: 24.9 %Beltrami County24.9Pipestone County: 24.9 %Pipestone County24.9Washington County: 24.9 %Washington County24.9Kandiyohi County: 24.8 %Kandiyohi County24.8Red Lake County: 24.7 %Red Lake County24.7Dakota County: 24.6 %Dakota County24.6Wadena County: 24.4 %Wadena County24.4Anoka County: 24.3 %Anoka County24.3Becker County: 24.3 %Becker County24.3Polk County: 24.2 %Polk County24.2Le Sueur County: 24.2 %Le Sueur County24.2Fillmore County: 24.2 %Fillmore County24.2Clearwater County: 24.2 %Clearwater County24.2Roseau County: 24.2 %Roseau County24.2Olmsted County: 24 %Olmsted County24Isanti County: 23.9 %Isanti County23.9Meeker County: 23.9 %Meeker County23.9Mille Lacs County: 23.9 %Mille Lacs County23.9Sibley County: 23.7 %Sibley County23.7Lincoln County: 23.6 %Lincoln County23.6Morrison County: 23.6 %Morrison County23.6Cottonwood County: 23.6 %Cottonwood County23.6Wilkin County: 23.4 %Wilkin County23.4Stearns County: 23.4 %Stearns County23.4Mahnomen County: 29.8 %Mahnomen County29.8Wright County: 28.4 %Wright County28.4Scott County: 27.7 %Scott County27.7Carver County: 27.6 %Carver County27.6Nobles County: 27.5 %Nobles County27.5Sherburne County: 26.7 %Sherburne County26.7Dodge County: 26.4 %Dodge County26.4Rock County: 25.8 %Rock County25.8Lyon County: 25.4 %Lyon County25.4Mower County: 25.3 %Mower County25.3Benton County: 25.1 %Benton County25.1Steele County: 25.1 %Steele County25.1Clay County: 25 %Clay County25Watonwan County: 24.9 %Watonwan County24.9Redwood County: 24.9 %Redwood County24.9Todd County: 24.9 %Todd County24.9Beltrami County: 24.9 %Beltrami County24.9Pipestone County: 24.9 %Pipestone County24.9Washington County: 24.9 %Washington County24.9Kandiyohi County: 24.8 %Kandiyohi County24.8Red Lake County: 24.7 %Red Lake County24.7Dakota County: 24.6 %Dakota County24.6Wadena County: 24.4 %Wadena County24.4Anoka County: 24.3 %Anoka County24.3Becker County: 24.3 %Becker County24.3Polk County: 24.2 %Polk County24.2Le Sueur County: 24.2 %Le Sueur County24.2Fillmore County: 24.2 %Fillmore County24.2Clearwater County: 24.2 %Clearwater County24.2Roseau County: 24.2 %Roseau County24.2Olmsted County: 24 %Olmsted County24Isanti County: 23.9 %Isanti County23.9Meeker County: 23.9 %Meeker County23.9Mille Lacs County: 23.9 %Mille Lacs County23.9Sibley County: 23.7 %Sibley County23.7Lincoln County: 23.6 %Lincoln County23.6Morrison County: 23.6 %Morrison County23.6Cottonwood County: 23.6 %Cottonwood County23.6Wilkin County: 23.4 %Wilkin County23.4Stearns County: 23.4 %Stearns County23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Mahnomen County29.8-0.6 pts
2Wright County28.4-0.2 pts
3Scott County27.7-0.5 pts
4Carver County27.6-0.2 pts
5Nobles County27.5+0.5 pts
6Sherburne County26.7-0.1 pts
7Dodge County26.4-0.5 pts
8Rock County25.8-0.2 pts
9Lyon County25.4+0.2 pts
10Mower County25.3+0.1 pts
11Benton County25.1-0.1 pts
12Steele County25.1-0.3 pts
13Clay County25+0.2 pts
14Watonwan County24.9+0.2 pts
15Redwood County24.9+0.3 pts
16Todd County24.9-0.1 pts
17Beltrami County24.9-0.1 pts
18Pipestone County24.9+0.5 pts
19Washington County24.9-0.1 pts
20Kandiyohi County24.8+0.1 pts
21Red Lake County24.7-0.4 pts
22Dakota County24.6-0.2 pts
23Wadena County24.4+0.2 pts
24Anoka County24.3-0.1 pts
25Becker County24.3-0.1 pts
26Polk County24.2+0.1 pts
27Le Sueur County24.2-0.2 pts
28Fillmore County24.20 pts
29Clearwater County24.2-0.3 pts
30Roseau County24.2-0.3 pts
31Olmsted County24-0.1 pts
32Isanti County23.9-0.2 pts
33Meeker County23.9-0.2 pts
34Mille Lacs County23.9-0.4 pts
35Sibley County23.7-0.3 pts
36Lincoln County23.6-0 pts
37Morrison County23.6-0.1 pts
38Cottonwood County23.6+0.2 pts
39Wilkin County23.4-0.2 pts
40Stearns County23.4+0.1 pts
41Chippewa County23.4+0.4 pts
42Marshall County23.3+0.1 pts
43Yellow Medicine County23.30 pts
44Swift County23.2+0.3 pts
45Waseca County23.1-0.3 pts
46Chisago County23.1-0.3 pts
47Norman County230 pts
48Ramsey County23-0.1 pts
49Nicollet County22.9+0.2 pts
50McLeod County22.8-0.3 pts
51Renville County22.8-0.1 pts
52Grant County22.8-0.1 pts
53Stevens County22.7+0.8 pts
54Pennington County22.7+0.2 pts
55Carlton County22.5-0.1 pts
56Goodhue County22.5-0.1 pts
57Jackson County22.5-0.1 pts
58Rice County22.3-0.1 pts
59Houston County22.2+0.1 pts
60Freeborn County22.2-0.1 pts
61Faribault County21.90 pts
62Murray County21.9-0.1 pts
63Hubbard County21.9+0.2 pts
64Kanabec County21.90 pts
65Crow Wing County21.8-0.2 pts
66Hennepin County21.7-0.1 pts
67Otter Tail County21.70 pts
68Martin County21.70 pts
69Douglas County21.6+0.2 pts
70Brown County21.5-0.4 pts
71Wabasha County21.5-0.2 pts
72Traverse County21.5+0.2 pts
73Pope County21.3-0 pts
74Cass County21.3-0.1 pts
75Lac qui Parle County21.2+0.3 pts
76Kittson County21.2+0.6 pts
77Big Stone County21.2+0.4 pts
78Itasca County21.1-0.2 pts
79Pine County20.4-0.3 pts
80Blue Earth County20.3-0 pts
81St. Louis County19.2-0.1 pts
82Koochiching County19-0.1 pts
83Winona County18.8+0.1 pts
84Lake County18.7+0.1 pts
85Lake of the Woods County18.3+0.2 pts
86Aitkin County17+0.1 pts
87Cook County16.2+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 Minnesota by population under 18, 2018) [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 Minnesota by population under 18, 2018. 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/minnesota-counties?period=2018. 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 Minnesota by population under 18, 2018. 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/minnesota-counties?period=2018.

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 Minnesota by population under 18, 2018 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/minnesota-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_minnesota_by_2018,
  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 Minnesota by population under 18, 2018}},
  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/minnesota-counties?period=2018. 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 Minnesota by population under 18, 2018
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/minnesota-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/minnesota-counties?period=2018.
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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Questions

Which county has the highest population under 18?

Mahnomen County, with 29.8% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cook County, with 16.2% in 2018.

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 Minnesota: more rankings