Data / Rankings / Population under 18 / Counties in Kansas

Counties in Kansas by population under 18

Seward County had the highest population under 18 of 105 counties in 2019, at 30.9%. Riley County had the lowest, at 17.4%. The median was 23.3% and the figure for Kansas was 24.2%. Source: the U.S. Census Bureau.

Highest30.9Seward County
Lowest17.4Riley County
Median23.3105 counties
Kansas24.2History

Top 40 counties, 2019

Seward County: 30.9 %Seward County30.9Ford County: 30.8 %Ford County30.8Haskell County: 30.4 %Haskell County30.4Grant County: 30.1 %Grant County30.1Hamilton County: 29.9 %Hamilton County29.9Finney County: 29.6 %Finney County29.6Pottawatomie County: 29.3 %Pottawatomie County29.3Geary County: 29.2 %Geary County29.2Stevens County: 28.8 %Stevens County28.8Kearny County: 28.4 %Kearny County28.4Stanton County: 28.4 %Stanton County28.4Gray County: 28.1 %Gray County28.1Wyandotte County: 27.2 %Wyandotte County27.2Scott County: 26.4 %Scott County26.4Gove County: 26.2 %Gove County26.2Meade County: 26.1 %Meade County26.1Nemaha County: 26 %Nemaha County26Wichita County: 25.8 %Wichita County25.8Butler County: 25.8 %Butler County25.8Jackson County: 25.4 %Jackson County25.4Bourbon County: 25.4 %Bourbon County25.4Anderson County: 25.4 %Anderson County25.4Sedgwick County: 25.2 %Sedgwick County25.2Logan County: 25 %Logan County25Labette County: 24.9 %Labette County24.9Wallace County: 24.8 %Wallace County24.8Miami County: 24.8 %Miami County24.8Neosho County: 24.8 %Neosho County24.8Hodgeman County: 24.8 %Hodgeman County24.8Brown County: 24.6 %Brown County24.6Sheridan County: 24.6 %Sheridan County24.6Sumner County: 24.6 %Sumner County24.6Greeley County: 24.5 %Greeley County24.5Johnson County: 24.4 %Johnson County24.4Harper County: 24.4 %Harper County24.4Sherman County: 24.3 %Sherman County24.3Morton County: 24.3 %Morton County24.3Barton County: 24.1 %Barton County24.1Leavenworth County: 24 %Leavenworth County24Marshall County: 24 %Marshall County24
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Seward County30.9-0.5 pts
2Ford County30.8-0.1 pts
3Haskell County30.4+0.5 pts
4Grant County30.1-0.7 pts
5Hamilton County29.9+0.3 pts
6Finney County29.6-0.3 pts
7Pottawatomie County29.30 pts
8Geary County29.2-0.2 pts
9Stevens County28.8-0.5 pts
10Kearny County28.4+0.1 pts
11Stanton County28.4-0 pts
12Gray County28.1-0.5 pts
13Wyandotte County27.2-0.2 pts
14Scott County26.4-0.6 pts
15Gove County26.2+0.9 pts
16Meade County26.10 pts
17Nemaha County26+0.5 pts
18Wichita County25.8-1.1 pts
19Butler County25.8-0.1 pts
20Jackson County25.4+0.1 pts
21Bourbon County25.4+0.1 pts
22Anderson County25.4+0.1 pts
23Sedgwick County25.2-0.3 pts
24Logan County25+0.6 pts
25Labette County24.9+0.1 pts
26Wallace County24.8+1.1 pts
27Miami County24.8-0.2 pts
28Neosho County24.8-0.2 pts
29Hodgeman County24.8+0.6 pts
30Brown County24.6-0 pts
31Sheridan County24.6-0.6 pts
32Sumner County24.6-0.3 pts
33Greeley County24.5+0.1 pts
34Johnson County24.4-0.3 pts
35Harper County24.4-0.2 pts
36Sherman County24.3+0.9 pts
37Morton County24.3-1.2 pts
38Barton County24.1+0.1 pts
39Leavenworth County24-0.1 pts
40Marshall County24+0.1 pts
41Harvey County23.9+0.1 pts
42Pratt County23.9-0.3 pts
43Wabaunsee County23.8-0.6 pts
44Montgomery County23.80 pts
45Franklin County23.6-0.2 pts
46Cowley County23.6-0.3 pts
47Wilson County23.5-0.4 pts
48Dickinson County23.5-0.6 pts
49Shawnee County23.5-0.2 pts
50Lincoln County23.5+0.3 pts
51Thomas County23.3-0.1 pts
52Comanche County23.3-1.1 pts
53Jefferson County23.3-0 pts
54Saline County23.3-0.2 pts
55Osage County23.3+0.1 pts
56Rice County23.20 pts
57Cherokee County23.1-0 pts
58Coffey County23.1-0.2 pts
59Linn County23-0.5 pts
60Kiowa County23+1 pts
61Stafford County22.9-0.6 pts
62Kingman County22.9+0.1 pts
63Cloud County22.9+0.5 pts
64Washington County22.80 pts
65Mitchell County22.8-0.2 pts
66Ottawa County22.6-0.3 pts
67Clark County22.6+0.2 pts
68Crawford County22.5+0.1 pts
69Russell County22.5+0.3 pts
70Clay County22.4-0.3 pts
71Rawlins County22.4+0.6 pts
72Reno County22.3-0.3 pts
73Edwards County22.2-0.3 pts
74Atchison County22.2-0.5 pts
75Doniphan County22.20 pts
76Lyon County22.1-0.1 pts
77McPherson County22.1-0.3 pts
78Phillips County22.1+0.1 pts
79Rooks County22.1+0.2 pts
80Cheyenne County220 pts
81Marion County21.90 pts
82Elk County21.9+1.3 pts
83Woodson County21.7+0.1 pts
84Barber County21.6-0.2 pts
85Allen County21.6-0.3 pts
86Greenwood County21.6-0.1 pts
87Morris County21.4+0.1 pts
88Chautauqua County21.3+0.2 pts
89Osborne County21.2+0.5 pts
90Republic County21.10 pts
91Graham County20.9+0.8 pts
92Chase County20.8+0.8 pts
93Ellis County20.8-0.3 pts
94Jewell County20.8+0.9 pts
95Rush County20.7-0.4 pts
96Lane County20.7-0.1 pts
97Decatur County20.50 pts
98Smith County20.1-0.1 pts
99Trego County20.1+0.3 pts
100Pawnee County20-0.3 pts
101Ness County19.4-0.4 pts
102Ellsworth County19.20 pts
103Douglas County19.1-0 pts
104Norton County18.8-0.1 pts
105Riley County17.4+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 Kansas by population under 18, 2019) [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 Kansas by population under 18, 2019. 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/kansas-counties?period=2019. 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 Kansas by population under 18, 2019. 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/kansas-counties?period=2019.

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 Kansas by population under 18, 2019 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/kansas-counties?period=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kansas_by_2019,
  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 Kansas by population under 18, 2019}},
  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/kansas-counties?period=2019. 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 Kansas by population under 18, 2019
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/kansas-counties?period=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kansas-counties?period=2019.
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?

Seward County, with 30.9% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Riley County, with 17.4% in 2019.

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 Kansas: more rankings