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 2021, at 29.1%. Cook County had the lowest, at 15.2%. The median was 23.1% and the figure for Minnesota was 22.9%. Source: the U.S. Census Bureau.

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Highest29.1Mahnomen County
Lowest15.2Cook County
Median23.187 counties
Minnesota22.9History

Map of counties, 2021

Aitkin County: 16.2 %Anoka County: 23.9 %Becker County: 23.7 %Beltrami County: 24.8 %Benton County: 24.9 %Big Stone County: 21.9 %Blue Earth County: 20.2 %Brown County: 21.5 %Carlton County: 22.1 %Carver County: 26.2 %Cass County: 20.6 %Chippewa County: 23.8 %Chisago County: 22.8 %Clay County: 25.3 %Clearwater County: 25.2 %Cook County: 15.2 %Cottonwood County: 24.7 %Crow Wing County: 21.1 %Dakota County: 24 %Dodge County: 26 %Douglas County: 21.3 %Faribault County: 21.8 %Fillmore County: 23.9 %Freeborn County: 22 %Goodhue County: 22.1 %Grant County: 23.2 %Hennepin County: 21.3 %Houston County: 22.1 %Hubbard County: 22.2 %Isanti County: 23.5 %Itasca County: 20.9 %Jackson County: 22.2 %Kanabec County: 21.8 %Kandiyohi County: 24.6 %Kittson County: 21.8 %Koochiching County: 18.1 %Lac qui Parle County: 21.6 %Lake County: 18.8 %Lake of the Woods County: 18.3 %Le Sueur County: 23.5 %Lincoln County: 23.2 %Lyon County: 25.4 %McLeod County: 22 %Mahnomen County: 29.1 %Marshall County: 23.5 %Martin County: 21.8 %Meeker County: 23.5 %Mille Lacs County: 23.3 %Morrison County: 23.2 %Mower County: 25.3 %Murray County: 21.6 %Nicollet County: 22.6 %Nobles County: 28.2 %Norman County: 22.7 %Olmsted County: 23.5 %Otter Tail County: 21.4 %Pennington County: 22.1 %Pine County: 20.3 %Pipestone County: 25.3 %Polk County: 24.7 %Pope County: 22.1 %Ramsey County: 22.7 %Red Lake County: 24.8 %Redwood County: 25 %Renville County: 23.1 %Rice County: 21.8 %Rock County: 24.6 %Roseau County: 23.7 %St. Louis County: 18.8 %Scott County: 26.4 %Sherburne County: 26.2 %Sibley County: 22.7 %Stearns County: 23.7 %Steele County: 24.4 %Stevens County: 23.2 %Swift County: 23 %Todd County: 24.9 %Traverse County: 21.8 %Wabasha County: 21.9 %Wadena County: 25.1 %Waseca County: 22.7 %Washington County: 24.2 %Watonwan County: 25.3 %Wilkin County: 23.3 %Winona County: 18.5 %Wright County: 27.7 %Yellow Medicine County: 22.9 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 to 25
  • 25 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Mahnomen County: 29.1 %Mahnomen County29.1Nobles County: 28.2 %Nobles County28.2Wright County: 27.7 %Wright County27.7Scott County: 26.4 %Scott County26.4Carver County: 26.2 %Carver County26.2Sherburne County: 26.2 %Sherburne County26.2Dodge County: 26 %Dodge County26Lyon County: 25.4 %Lyon County25.4Pipestone County: 25.3 %Pipestone County25.3Clay County: 25.3 %Clay County25.3Mower County: 25.3 %Mower County25.3Watonwan County: 25.3 %Watonwan County25.3Clearwater County: 25.2 %Clearwater County25.2Wadena County: 25.1 %Wadena County25.1Redwood County: 25 %Redwood County25Benton County: 24.9 %Benton County24.9Todd County: 24.9 %Todd County24.9Beltrami County: 24.8 %Beltrami County24.8Red Lake County: 24.8 %Red Lake County24.8Cottonwood County: 24.7 %Cottonwood County24.7Polk County: 24.7 %Polk County24.7Rock County: 24.6 %Rock County24.6Kandiyohi County: 24.6 %Kandiyohi County24.6Steele County: 24.4 %Steele County24.4Washington County: 24.2 %Washington County24.2Dakota County: 24 %Dakota County24Anoka County: 23.9 %Anoka County23.9Fillmore County: 23.9 %Fillmore County23.9Chippewa County: 23.8 %Chippewa County23.8Roseau County: 23.7 %Roseau County23.7Becker County: 23.7 %Becker County23.7Stearns County: 23.7 %Stearns County23.7Olmsted County: 23.5 %Olmsted County23.5Isanti County: 23.5 %Isanti County23.5Meeker County: 23.5 %Meeker County23.5Le Sueur County: 23.5 %Le Sueur County23.5Marshall County: 23.5 %Marshall County23.5Mille Lacs County: 23.3 %Mille Lacs County23.3Wilkin County: 23.3 %Wilkin County23.3Grant County: 23.2 %Grant County23.2Mahnomen County: 29.1 %Mahnomen County29.1Nobles County: 28.2 %Nobles County28.2Wright County: 27.7 %Wright County27.7Scott County: 26.4 %Scott County26.4Carver County: 26.2 %Carver County26.2Sherburne County: 26.2 %Sherburne County26.2Dodge County: 26 %Dodge County26Lyon County: 25.4 %Lyon County25.4Pipestone County: 25.3 %Pipestone County25.3Clay County: 25.3 %Clay County25.3Mower County: 25.3 %Mower County25.3Watonwan County: 25.3 %Watonwan County25.3Clearwater County: 25.2 %Clearwater County25.2Wadena County: 25.1 %Wadena County25.1Redwood County: 25 %Redwood County25Benton County: 24.9 %Benton County24.9Todd County: 24.9 %Todd County24.9Beltrami County: 24.8 %Beltrami County24.8Red Lake County: 24.8 %Red Lake County24.8Cottonwood County: 24.7 %Cottonwood County24.7Polk County: 24.7 %Polk County24.7Rock County: 24.6 %Rock County24.6Kandiyohi County: 24.6 %Kandiyohi County24.6Steele County: 24.4 %Steele County24.4Washington County: 24.2 %Washington County24.2Dakota County: 24 %Dakota County24Anoka County: 23.9 %Anoka County23.9Fillmore County: 23.9 %Fillmore County23.9Chippewa County: 23.8 %Chippewa County23.8Roseau County: 23.7 %Roseau County23.7Becker County: 23.7 %Becker County23.7Stearns County: 23.7 %Stearns County23.7Olmsted County: 23.5 %Olmsted County23.5Isanti County: 23.5 %Isanti County23.5Meeker County: 23.5 %Meeker County23.5Le Sueur County: 23.5 %Le Sueur County23.5Marshall County: 23.5 %Marshall County23.5Mille Lacs County: 23.3 %Mille Lacs County23.3Wilkin County: 23.3 %Wilkin County23.3Grant County: 23.2 %Grant County23.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Mahnomen County29.1+0.1 pts
2Nobles County28.2+0.1 pts
3Wright County27.7-0.4 pts
4Scott County26.4-0.5 pts
5Carver County26.2-0.6 pts
6Sherburne County26.2-0.3 pts
7Dodge County26-0.5 pts
8Lyon County25.4-0 pts
9Pipestone County25.3+0.2 pts
10Clay County25.3-0 pts
11Mower County25.3-0.2 pts
12Watonwan County25.3+0.3 pts
13Clearwater County25.2+0.2 pts
14Wadena County25.1+0.1 pts
15Redwood County25-0.1 pts
16Benton County24.9-0.4 pts
17Todd County24.9-0.2 pts
18Beltrami County24.8-0.2 pts
19Red Lake County24.8+0.2 pts
20Cottonwood County24.7+0.7 pts
21Polk County24.7-0.1 pts
22Rock County24.6-0.2 pts
23Kandiyohi County24.6-0.3 pts
24Steele County24.4-0.2 pts
25Washington County24.2-0.3 pts
26Dakota County24-0.3 pts
27Anoka County23.9-0.2 pts
28Fillmore County23.9-0.3 pts
29Chippewa County23.8-0 pts
30Roseau County23.7-0.3 pts
31Becker County23.7-0.2 pts
32Stearns County23.7-0.1 pts
33Olmsted County23.5-0.2 pts
34Isanti County23.5-0.4 pts
35Meeker County23.5-0.3 pts
36Le Sueur County23.5-0.2 pts
37Marshall County23.5-0.1 pts
38Mille Lacs County23.3-0.2 pts
39Wilkin County23.3+0.1 pts
40Grant County23.2-0.1 pts
41Morrison County23.2-0.3 pts
42Stevens County23.2-0.1 pts
43Lincoln County23.2-0.6 pts
44Renville County23.1-0.2 pts
45Swift County23-0 pts
46Yellow Medicine County22.9+0.2 pts
47Chisago County22.8-0.3 pts
48Waseca County22.7-0.4 pts
49Norman County22.70 pts
50Sibley County22.7-0.2 pts
51Ramsey County22.7-0.3 pts
52Nicollet County22.6-0.1 pts
53Hubbard County22.2-0.1 pts
54Jackson County22.2-0.2 pts
55Goodhue County22.1-0.2 pts
56Pennington County22.1-0.4 pts
57Houston County22.1-0.2 pts
58Carlton County22.1-0.3 pts
59Pope County22.1-0 pts
60McLeod County22-0.4 pts
61Freeborn County22-0.3 pts
62Big Stone County21.9+0.4 pts
63Wabasha County21.9-0.2 pts
64Rice County21.8-0.4 pts
65Martin County21.8+0.1 pts
66Kanabec County21.8-0 pts
67Traverse County21.80 pts
68Kittson County21.8+0.3 pts
69Faribault County21.8-0.2 pts
70Lac qui Parle County21.6+0.4 pts
71Murray County21.6-0.1 pts
72Brown County21.5-0.1 pts
73Otter Tail County21.4-0.2 pts
74Douglas County21.3-0.2 pts
74Hennepin County21.3-0.2 pts
76Crow Wing County21.1-0.3 pts
77Itasca County20.9-0.2 pts
78Cass County20.6-0.2 pts
79Pine County20.3+0.1 pts
80Blue Earth County20.2-0.2 pts
81Lake County18.8-0.3 pts
82St. Louis County18.8-0.2 pts
83Winona County18.5-0.2 pts
84Lake of the Woods County18.3+0.1 pts
85Koochiching County18.1-0.1 pts
86Aitkin County16.2-0.5 pts
87Cook County15.2-0.5 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, 2021) [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, 2021. 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=2021. 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, 2021. 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=2021.

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, 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_minnesota_by_2021,
  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, 2021}},
  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=2021. 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, 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/minnesota-counties?period=2021.
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 29.1% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cook County, with 15.2% in 2021.

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