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 2018, at 31.3%. Riley County had the lowest, at 16.9%. The median was 23.5% and the figure for Kansas was 24.4%. Source: the U.S. Census Bureau.

Highest31.3Seward County
Lowest16.9Riley County
Median23.5105 counties
Kansas24.4History

Top 40 counties, 2018

Seward County: 31.3 %Seward County31.3Ford County: 30.9 %Ford County30.9Grant County: 30.8 %Grant County30.8Haskell County: 29.9 %Haskell County29.9Finney County: 29.9 %Finney County29.9Hamilton County: 29.6 %Hamilton County29.6Geary County: 29.4 %Geary County29.4Stevens County: 29.4 %Stevens County29.4Pottawatomie County: 29.3 %Pottawatomie County29.3Gray County: 28.6 %Gray County28.6Stanton County: 28.5 %Stanton County28.5Kearny County: 28.3 %Kearny County28.3Wyandotte County: 27.4 %Wyandotte County27.4Wichita County: 27 %Wichita County27Scott County: 26.9 %Scott County26.9Meade County: 26 %Meade County26Butler County: 25.9 %Butler County25.9Nemaha County: 25.5 %Nemaha County25.5Sedgwick County: 25.5 %Sedgwick County25.5Morton County: 25.5 %Morton County25.5Jackson County: 25.3 %Jackson County25.3Anderson County: 25.3 %Anderson County25.3Bourbon County: 25.3 %Bourbon County25.3Gove County: 25.2 %Gove County25.2Sheridan County: 25.2 %Sheridan County25.2Neosho County: 25 %Neosho County25Miami County: 25 %Miami County25Sumner County: 24.9 %Sumner County24.9Labette County: 24.7 %Labette County24.7Johnson County: 24.7 %Johnson County24.7Brown County: 24.7 %Brown County24.7Harper County: 24.6 %Harper County24.6Logan County: 24.5 %Logan County24.5Wabaunsee County: 24.4 %Wabaunsee County24.4Greeley County: 24.4 %Greeley County24.4Comanche County: 24.4 %Comanche County24.4Pratt County: 24.2 %Pratt County24.2Hodgeman County: 24.2 %Hodgeman County24.2Leavenworth County: 24.1 %Leavenworth County24.1Dickinson County: 24.1 %Dickinson County24.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Seward County31.3+0.1 pts
2Ford County30.9-0.3 pts
3Grant County30.8-0.7 pts
4Haskell County29.9-0.5 pts
5Finney County29.9-0.3 pts
6Hamilton County29.6-1 pts
7Geary County29.4-0.5 pts
8Stevens County29.4-0.1 pts
9Pottawatomie County29.3+0.2 pts
10Gray County28.6-0.2 pts
11Stanton County28.5-0.2 pts
12Kearny County28.3+0.1 pts
13Wyandotte County27.4-0.2 pts
14Wichita County27+0.4 pts
15Scott County26.9+0.2 pts
16Meade County26-0.6 pts
17Butler County25.9-0.3 pts
18Nemaha County25.5-0.3 pts
19Sedgwick County25.5-0.3 pts
20Morton County25.5+0.4 pts
21Jackson County25.3-0.1 pts
22Anderson County25.3+0.1 pts
22Bourbon County25.3-0 pts
24Gove County25.2+0.2 pts
25Sheridan County25.2-0.1 pts
26Neosho County25+0.1 pts
27Miami County25-0.1 pts
28Sumner County24.9+0.1 pts
29Labette County24.7+0.1 pts
30Johnson County24.7-0.3 pts
31Brown County24.7+0.1 pts
32Harper County24.6+0.3 pts
33Logan County24.5+0.3 pts
34Wabaunsee County24.4+0.2 pts
35Greeley County24.4+0.4 pts
36Comanche County24.4-0.1 pts
37Pratt County24.2-0 pts
38Hodgeman County24.2+0.4 pts
39Leavenworth County24.1-0.1 pts
40Dickinson County24.1-0.3 pts
41Barton County24-0.1 pts
42Marshall County23.9+0.5 pts
43Wilson County23.9-0.1 pts
44Cowley County23.9-0.2 pts
45Franklin County23.8-0.5 pts
46Harvey County23.8-0.4 pts
47Shawnee County23.7-0.2 pts
48Montgomery County23.7-0 pts
49Wallace County23.7-0.8 pts
50Stafford County23.5-0.3 pts
51Linn County23.5-0.2 pts
52Saline County23.5-0.1 pts
53Sherman County23.5-0.1 pts
54Thomas County23.5-0 pts
55Jefferson County23.4-0.3 pts
56Coffey County23.3+0.2 pts
57Rice County23.2-0.2 pts
58Osage County23.2-0.1 pts
59Cherokee County23.1-0.2 pts
60Lincoln County23.1-0.6 pts
61Mitchell County22.9+0.4 pts
62Ottawa County22.9-0.2 pts
63Washington County22.8+0.2 pts
64Kingman County22.70 pts
65Atchison County22.7-0.2 pts
66Clay County22.7+0.1 pts
67Reno County22.6-0.2 pts
68Edwards County22.5-0 pts
69Crawford County22.5+0.1 pts
70Clark County22.4-0.4 pts
71McPherson County22.4-0.4 pts
72Cloud County22.4+0.2 pts
73Russell County22.3+0.2 pts
74Lyon County22.3-0.2 pts
75Doniphan County22.1+0.5 pts
76Phillips County22-0.7 pts
77Kiowa County22-0.1 pts
78Cheyenne County22-0.5 pts
79Allen County21.9-0.2 pts
80Rooks County21.9-0.3 pts
81Marion County21.9-0 pts
82Barber County21.8-0.2 pts
83Rawlins County21.7+1.1 pts
84Greenwood County21.7+0.3 pts
85Woodson County21.6+0.3 pts
86Morris County21.3+0.6 pts
87Rush County21.2-0.5 pts
88Republic County21.1+0.7 pts
89Chautauqua County21.1-0.1 pts
90Ellis County21-0.1 pts
91Lane County20.8+0.2 pts
92Osborne County20.7-0.6 pts
93Elk County20.5+0.1 pts
94Decatur County20.5+0.2 pts
95Pawnee County20.3-0.3 pts
96Smith County20.2+0.3 pts
97Graham County20.1-0.3 pts
98Chase County20.1-1.3 pts
99Jewell County19.9+0.3 pts
100Trego County19.7-0.3 pts
101Ness County19.7-0.5 pts
102Douglas County19.1-0.2 pts
103Ellsworth County19.1-0.2 pts
104Norton County19+0.1 pts
105Riley County16.9-0.3 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, 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 Kansas 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/kansas-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 Kansas 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/kansas-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 Kansas 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/kansas-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_kansas_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 Kansas 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/kansas-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 Kansas 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/kansas-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/kansas-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?

Seward County, with 31.3% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Riley County, with 16.9% 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 Kansas: more rankings