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 2020, at 29%. Cook County had the lowest, at 15.6%. The median was 23.2% and the figure for Minnesota was 23.1%. Source: the U.S. Census Bureau.

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Highest29Mahnomen County
Lowest15.6Cook County
Median23.287 counties
Minnesota23.1History

Map of counties, 2020

Aitkin County: 16.6 %Anoka County: 24.1 %Becker County: 23.9 %Beltrami County: 25.1 %Benton County: 25.3 %Big Stone County: 21.5 %Blue Earth County: 20.4 %Brown County: 21.6 %Carlton County: 22.4 %Carver County: 26.8 %Cass County: 20.8 %Chippewa County: 23.8 %Chisago County: 23.1 %Clay County: 25.4 %Clearwater County: 25 %Cook County: 15.6 %Cottonwood County: 24 %Crow Wing County: 21.3 %Dakota County: 24.3 %Dodge County: 26.5 %Douglas County: 21.5 %Faribault County: 21.9 %Fillmore County: 24.1 %Freeborn County: 22.2 %Goodhue County: 22.3 %Grant County: 23.4 %Hennepin County: 21.5 %Houston County: 22.3 %Hubbard County: 22.3 %Isanti County: 24 %Itasca County: 21.1 %Jackson County: 22.4 %Kanabec County: 21.8 %Kandiyohi County: 24.9 %Kittson County: 21.5 %Koochiching County: 18.1 %Lac qui Parle County: 21.2 %Lake County: 19.1 %Lake of the Woods County: 18.2 %Le Sueur County: 23.7 %Lincoln County: 23.7 %Lyon County: 25.5 %McLeod County: 22.4 %Mahnomen County: 29 %Marshall County: 23.6 %Martin County: 21.7 %Meeker County: 23.8 %Mille Lacs County: 23.5 %Morrison County: 23.5 %Mower County: 25.5 %Murray County: 21.7 %Nicollet County: 22.7 %Nobles County: 28.2 %Norman County: 22.7 %Olmsted County: 23.8 %Otter Tail County: 21.6 %Pennington County: 22.5 %Pine County: 20.2 %Pipestone County: 25.1 %Polk County: 24.8 %Pope County: 22.1 %Ramsey County: 22.9 %Red Lake County: 24.6 %Redwood County: 25 %Renville County: 23.3 %Rice County: 22.2 %Rock County: 24.8 %Roseau County: 24.1 %St. Louis County: 19 %Scott County: 26.9 %Sherburne County: 26.4 %Sibley County: 22.9 %Stearns County: 23.8 %Steele County: 24.7 %Stevens County: 23.3 %Swift County: 23 %Todd County: 25.1 %Traverse County: 21.8 %Wabasha County: 22 %Wadena County: 25 %Waseca County: 23.1 %Washington County: 24.5 %Watonwan County: 25 %Wilkin County: 23.2 %Winona County: 18.8 %Wright County: 28.1 %Yellow Medicine County: 22.7 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 to 25
  • 25 and over
%, 2020. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2020

Mahnomen County: 29 %Mahnomen County29Nobles County: 28.2 %Nobles County28.2Wright County: 28.1 %Wright County28.1Scott County: 26.9 %Scott County26.9Carver County: 26.8 %Carver County26.8Dodge County: 26.5 %Dodge County26.5Sherburne County: 26.4 %Sherburne County26.4Mower County: 25.5 %Mower County25.5Lyon County: 25.5 %Lyon County25.5Clay County: 25.4 %Clay County25.4Benton County: 25.3 %Benton County25.3Pipestone County: 25.1 %Pipestone County25.1Todd County: 25.1 %Todd County25.1Beltrami County: 25.1 %Beltrami County25.1Redwood County: 25 %Redwood County25Clearwater County: 25 %Clearwater County25Wadena County: 25 %Wadena County25Watonwan County: 25 %Watonwan County25Kandiyohi County: 24.9 %Kandiyohi County24.9Rock County: 24.8 %Rock County24.8Polk County: 24.8 %Polk County24.8Steele County: 24.7 %Steele County24.7Red Lake County: 24.6 %Red Lake County24.6Washington County: 24.5 %Washington County24.5Dakota County: 24.3 %Dakota County24.3Fillmore County: 24.1 %Fillmore County24.1Anoka County: 24.1 %Anoka County24.1Roseau County: 24.1 %Roseau County24.1Cottonwood County: 24 %Cottonwood County24Isanti County: 24 %Isanti County24Becker County: 23.9 %Becker County23.9Chippewa County: 23.8 %Chippewa County23.8Stearns County: 23.8 %Stearns County23.8Meeker County: 23.8 %Meeker County23.8Olmsted County: 23.8 %Olmsted County23.8Lincoln County: 23.7 %Lincoln County23.7Le Sueur County: 23.7 %Le Sueur County23.7Marshall County: 23.6 %Marshall County23.6Mille Lacs County: 23.5 %Mille Lacs County23.5Morrison County: 23.5 %Morrison County23.5Mahnomen County: 29 %Mahnomen County29Nobles County: 28.2 %Nobles County28.2Wright County: 28.1 %Wright County28.1Scott County: 26.9 %Scott County26.9Carver County: 26.8 %Carver County26.8Dodge County: 26.5 %Dodge County26.5Sherburne County: 26.4 %Sherburne County26.4Mower County: 25.5 %Mower County25.5Lyon County: 25.5 %Lyon County25.5Clay County: 25.4 %Clay County25.4Benton County: 25.3 %Benton County25.3Pipestone County: 25.1 %Pipestone County25.1Todd County: 25.1 %Todd County25.1Beltrami County: 25.1 %Beltrami County25.1Redwood County: 25 %Redwood County25Clearwater County: 25 %Clearwater County25Wadena County: 25 %Wadena County25Watonwan County: 25 %Watonwan County25Kandiyohi County: 24.9 %Kandiyohi County24.9Rock County: 24.8 %Rock County24.8Polk County: 24.8 %Polk County24.8Steele County: 24.7 %Steele County24.7Red Lake County: 24.6 %Red Lake County24.6Washington County: 24.5 %Washington County24.5Dakota County: 24.3 %Dakota County24.3Fillmore County: 24.1 %Fillmore County24.1Anoka County: 24.1 %Anoka County24.1Roseau County: 24.1 %Roseau County24.1Cottonwood County: 24 %Cottonwood County24Isanti County: 24 %Isanti County24Becker County: 23.9 %Becker County23.9Chippewa County: 23.8 %Chippewa County23.8Stearns County: 23.8 %Stearns County23.8Meeker County: 23.8 %Meeker County23.8Olmsted County: 23.8 %Olmsted County23.8Lincoln County: 23.7 %Lincoln County23.7Le Sueur County: 23.7 %Le Sueur County23.7Marshall County: 23.6 %Marshall County23.6Mille Lacs County: 23.5 %Mille Lacs County23.5Morrison County: 23.5 %Morrison County23.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Mahnomen County29-0.4 pts
2Nobles County28.2+0.3 pts
3Wright County28.1-0.2 pts
4Scott County26.9-0.5 pts
5Carver County26.8-0.5 pts
6Dodge County26.5+0.2 pts
7Sherburne County26.4-0 pts
8Mower County25.5+0.1 pts
9Lyon County25.5+0.2 pts
10Clay County25.4+0.3 pts
11Benton County25.3+0.1 pts
12Pipestone County25.1+0.6 pts
13Todd County25.1-0 pts
14Beltrami County25.1+0.1 pts
15Redwood County25+0.1 pts
16Clearwater County25+1 pts
17Wadena County25+0.3 pts
18Watonwan County25+0.1 pts
19Kandiyohi County24.9-0 pts
20Rock County24.8-0.3 pts
21Polk County24.8+0.2 pts
22Steele County24.7-0.3 pts
23Red Lake County24.6-0.1 pts
24Washington County24.5-0.2 pts
25Dakota County24.3-0.2 pts
26Fillmore County24.1-0 pts
27Anoka County24.1-0.2 pts
28Roseau County24.1-0.3 pts
29Cottonwood County24+0.4 pts
30Isanti County24-0.1 pts
31Becker County23.9-0.1 pts
32Chippewa County23.8+0.2 pts
33Stearns County23.8+0.2 pts
34Meeker County23.8+0.1 pts
35Olmsted County23.8-0.1 pts
36Lincoln County23.7+0.3 pts
37Le Sueur County23.7-0.4 pts
38Marshall County23.6+0.1 pts
39Mille Lacs County23.50 pts
40Morrison County23.5-0.1 pts
41Grant County23.4+0.2 pts
42Renville County23.3+0.4 pts
43Stevens County23.3+0.1 pts
44Wilkin County23.2-0.3 pts
45Chisago County23.1-0 pts
46Waseca County23.1-0.1 pts
47Swift County23-0.2 pts
48Ramsey County22.9+0.1 pts
49Sibley County22.9-0.3 pts
50Yellow Medicine County22.7-0.2 pts
51Nicollet County22.7-0 pts
52Norman County22.7+0.2 pts
53Pennington County22.50 pts
54McLeod County22.4-0.3 pts
55Carlton County22.40 pts
56Jackson County22.4-0.2 pts
57Goodhue County22.3-0.2 pts
58Houston County22.3+0.1 pts
59Hubbard County22.3+0.2 pts
60Freeborn County22.2+0.2 pts
61Rice County22.20 pts
62Pope County22.1+0.6 pts
63Wabasha County22+0.6 pts
64Faribault County21.9+0.1 pts
65Kanabec County21.8+0.3 pts
66Traverse County21.8+0.5 pts
67Martin County21.7-0.1 pts
68Murray County21.7+0.1 pts
69Brown County21.6+0.1 pts
70Otter Tail County21.6-0.1 pts
71Douglas County21.50 pts
72Big Stone County21.5+0.2 pts
73Kittson County21.5+0.3 pts
74Hennepin County21.5-0 pts
75Crow Wing County21.3-0.2 pts
76Lac qui Parle County21.2-0.6 pts
77Itasca County21.1+0.1 pts
78Cass County20.8-0.2 pts
79Blue Earth County20.4-0.1 pts
80Pine County20.2-0 pts
81Lake County19.10 pts
82St. Louis County19-0.1 pts
83Winona County18.80 pts
84Lake of the Woods County18.2-0.6 pts
85Koochiching County18.1-0.5 pts
86Aitkin County16.6-0.2 pts
87Cook County15.6-0.1 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, 2020) [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, 2020. 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=2020. 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, 2020. 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=2020.

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, 2020 [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=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_minnesota_by_2020,
  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, 2020}},
  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=2020. 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, 2020
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=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/minnesota-counties?period=2020.
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 Minnesota by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Mahnomen County, with 29% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Cook County, with 15.6% in 2020.

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