Data / Rankings / Population under 18 / Counties in Missouri

Counties in Missouri by population under 18

Scotland County had the highest population under 18 of 115 counties in 2017, at 30%. DeKalb County had the lowest, at 16.8%. The median was 22.8% and the figure for Missouri was 22.7%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest30Scotland County
Lowest16.8DeKalb County
Median22.8115 counties
Missouri22.7History

Map of counties, 2017

Adair County: 19.4 %Andrew County: 24 %Atchison County: 21 %Audrain County: 23.2 %Barry County: 23.3 %Barton County: 24.6 %Bates County: 23.7 %Benton County: 17.6 %Bollinger County: 22.2 %Boone County: 20.7 %Buchanan County: 22.5 %Butler County: 23.6 %Caldwell County: 23.8 %Callaway County: 21.6 %Camden County: 18.8 %Cape Girardeau County: 21.5 %Carroll County: 22.3 %Carter County: 22.8 %Cass County: 24.8 %Cedar County: 24.6 %Chariton County: 22.5 %Christian County: 26.2 %Clark County: 23.7 %Clay County: 24.8 %Clinton County: 23.8 %Cole County: 22.3 %Cooper County: 21.6 %Crawford County: 22.9 %Dade County: 21.3 %Dallas County: 23.8 %Daviess County: 26.1 %DeKalb County: 16.8 %Dent County: 22 %Douglas County: 21.5 %Dunklin County: 25.2 %Franklin County: 23.2 %Gasconade County: 21.2 %Gentry County: 24.8 %Greene County: 20.9 %Grundy County: 24.6 %Harrison County: 24 %Henry County: 22.3 %Hickory County: 16.8 %Holt County: 21 %Howard County: 21.9 %Howell County: 23.7 %Iron County: 21.3 %Jackson County: 23.4 %Jasper County: 25.3 %Jefferson County: 23.7 %Johnson County: 22.2 %Knox County: 24.1 %Laclede County: 24.2 %Lafayette County: 22.8 %Lawrence County: 25.2 %Lewis County: 21.8 %Lincoln County: 25.8 %Linn County: 23.8 %Livingston County: 20.3 %McDonald County: 26.2 %Macon County: 23.5 %Madison County: 23.1 %Maries County: 22 %Marion County: 23.2 %Mercer County: 23.3 %Miller County: 23.4 %Mississippi County: 20.7 %Moniteau County: 25.2 %Monroe County: 22.4 %Montgomery County: 22.2 %Morgan County: 22.5 %New Madrid County: 23.3 %Newton County: 23.9 %Nodaway County: 19.1 %Oregon County: 21.7 %Osage County: 23.2 %Ozark County: 19.5 %Pemiscot County: 26.1 %Perry County: 23.4 %Pettis County: 25 %Phelps County: 20.8 %Pike County: 22.2 %Platte County: 24.2 %Polk County: 23.8 %Pulaski County: 22.5 %Putnam County: 22.1 %Ralls County: 22.7 %Randolph County: 21.6 %Ray County: 23.3 %Reynolds County: 21.5 %Ripley County: 22.2 %St. Charles County: 24 %St. Clair County: 20.1 %Ste. Genevieve County: 21.2 %St. Francois County: 21.2 %St. Louis County: 22.1 %Saline County: 22.6 %Schuyler County: 26 %Scotland County: 30 %Scott County: 23.9 %Shannon County: 21.9 %Shelby County: 24.4 %Stoddard County: 22.4 %Stone County: 17.2 %Sullivan County: 23.6 %Taney County: 20.7 %Texas County: 21.9 %Vernon County: 24.3 %Warren County: 23.8 %Washington County: 22.9 %Wayne County: 20.2 %Webster County: 27.2 %Worth County: 21.6 %Wright County: 25.4 %St. Louis city: 18.9 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 to 25
  • 25 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2017

Scotland County: 30 %Scotland County30Webster County: 27.2 %Webster County27.2Christian County: 26.2 %Christian County26.2McDonald County: 26.2 %McDonald County26.2Pemiscot County: 26.1 %Pemiscot County26.1Daviess County: 26.1 %Daviess County26.1Schuyler County: 26 %Schuyler County26Lincoln County: 25.8 %Lincoln County25.8Wright County: 25.4 %Wright County25.4Jasper County: 25.3 %Jasper County25.3Lawrence County: 25.2 %Lawrence County25.2Moniteau County: 25.2 %Moniteau County25.2Dunklin County: 25.2 %Dunklin County25.2Pettis County: 25 %Pettis County25Gentry County: 24.8 %Gentry County24.8Cass County: 24.8 %Cass County24.8Clay County: 24.8 %Clay County24.8Barton County: 24.6 %Barton County24.6Grundy County: 24.6 %Grundy County24.6Cedar County: 24.6 %Cedar County24.6Shelby County: 24.4 %Shelby County24.4Vernon County: 24.3 %Vernon County24.3Platte County: 24.2 %Platte County24.2Laclede County: 24.2 %Laclede County24.2Knox County: 24.1 %Knox County24.1St. Charles County: 24 %St. Charles County24Andrew County: 24 %Andrew County24Harrison County: 24 %Harrison County24Scott County: 23.9 %Scott County23.9Newton County: 23.9 %Newton County23.9Warren County: 23.8 %Warren County23.8Dallas County: 23.8 %Dallas County23.8Clinton County: 23.8 %Clinton County23.8Linn County: 23.8 %Linn County23.8Polk County: 23.8 %Polk County23.8Caldwell County: 23.8 %Caldwell County23.8Howell County: 23.7 %Howell County23.7Bates County: 23.7 %Bates County23.7Clark County: 23.7 %Clark County23.7Jefferson County: 23.7 %Jefferson County23.7Scotland County: 30 %Scotland County30Webster County: 27.2 %Webster County27.2Christian County: 26.2 %Christian County26.2McDonald County: 26.2 %McDonald County26.2Pemiscot County: 26.1 %Pemiscot County26.1Daviess County: 26.1 %Daviess County26.1Schuyler County: 26 %Schuyler County26Lincoln County: 25.8 %Lincoln County25.8Wright County: 25.4 %Wright County25.4Jasper County: 25.3 %Jasper County25.3Lawrence County: 25.2 %Lawrence County25.2Moniteau County: 25.2 %Moniteau County25.2Dunklin County: 25.2 %Dunklin County25.2Pettis County: 25 %Pettis County25Gentry County: 24.8 %Gentry County24.8Cass County: 24.8 %Cass County24.8Clay County: 24.8 %Clay County24.8Barton County: 24.6 %Barton County24.6Grundy County: 24.6 %Grundy County24.6Cedar County: 24.6 %Cedar County24.6Shelby County: 24.4 %Shelby County24.4Vernon County: 24.3 %Vernon County24.3Platte County: 24.2 %Platte County24.2Laclede County: 24.2 %Laclede County24.2Knox County: 24.1 %Knox County24.1St. Charles County: 24 %St. Charles County24Andrew County: 24 %Andrew County24Harrison County: 24 %Harrison County24Scott County: 23.9 %Scott County23.9Newton County: 23.9 %Newton County23.9Warren County: 23.8 %Warren County23.8Dallas County: 23.8 %Dallas County23.8Clinton County: 23.8 %Clinton County23.8Linn County: 23.8 %Linn County23.8Polk County: 23.8 %Polk County23.8Caldwell County: 23.8 %Caldwell County23.8Howell County: 23.7 %Howell County23.7Bates County: 23.7 %Bates County23.7Clark County: 23.7 %Clark County23.7Jefferson County: 23.7 %Jefferson County23.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Scotland County30+0.5 pts
2Webster County27.2+0.1 pts
3Christian County26.2-0.3 pts
4McDonald County26.2-0.1 pts
5Pemiscot County26.1-0.1 pts
6Daviess County26.1-0.1 pts
7Schuyler County26+0.1 pts
8Lincoln County25.8-0.2 pts
9Wright County25.4+0.1 pts
10Jasper County25.3-0.1 pts
11Lawrence County25.2-0.1 pts
12Moniteau County25.2-0 pts
13Dunklin County25.2-0.1 pts
14Pettis County25+0.1 pts
15Gentry County24.8-0.1 pts
16Cass County24.8-0.2 pts
17Clay County24.8-0.2 pts
18Barton County24.6-0.2 pts
19Grundy County24.6+0.1 pts
20Cedar County24.6+0.1 pts
21Shelby County24.4+0.4 pts
22Vernon County24.3-0.1 pts
23Platte County24.20 pts
24Laclede County24.2-0.1 pts
25Knox County24.1+0.2 pts
26St. Charles County24-0.2 pts
27Andrew County240 pts
28Harrison County24-0.1 pts
29Scott County23.9+0.1 pts
30Newton County23.9-0.4 pts
31Warren County23.8-0.2 pts
32Dallas County23.8+0.3 pts
33Clinton County23.8-0 pts
34Linn County23.8+0.2 pts
35Polk County23.8+0.1 pts
36Caldwell County23.8-0.3 pts
37Howell County23.7-0.1 pts
38Bates County23.7-0.1 pts
39Clark County23.7-0.1 pts
40Jefferson County23.7-0.2 pts
41Butler County23.6-0.1 pts
42Sullivan County23.6-0.2 pts
43Macon County23.5-0.2 pts
44Miller County23.4-0.3 pts
45Perry County23.4-0.5 pts
46Jackson County23.4-0.2 pts
47Mercer County23.3-0.3 pts
48New Madrid County23.3-0.3 pts
49Barry County23.3+0.3 pts
50Ray County23.3-0 pts
51Franklin County23.2-0.1 pts
52Osage County23.2-0.1 pts
53Audrain County23.2-0.2 pts
54Marion County23.2-0.2 pts
55Madison County23.1-0.3 pts
56Crawford County22.9-0.3 pts
57Washington County22.9-0 pts
58Lafayette County22.8-0.1 pts
59Carter County22.8-0.1 pts
60Ralls County22.7+0.3 pts
61Saline County22.6-0.3 pts
62Morgan County22.5+0.1 pts
63Buchanan County22.5-0.1 pts
64Pulaski County22.5-0.1 pts
65Chariton County22.5+0.2 pts
66Stoddard County22.4-0.2 pts
67Monroe County22.4-0.1 pts
68Cole County22.3-0.2 pts
69Carroll County22.3-0.3 pts
70Henry County22.3-0.1 pts
71Bollinger County22.2-0.2 pts
72Ripley County22.2-0.4 pts
73Johnson County22.2-0.1 pts
74Montgomery County22.2-0.4 pts
75Pike County22.2-0.1 pts
76St. Louis County22.1-0.1 pts
77Putnam County22.1-0.1 pts
78Dent County22-0.2 pts
79Maries County22-0 pts
80Shannon County21.9-0.1 pts
81Texas County21.9-0.2 pts
82Howard County21.9-0.3 pts
83Lewis County21.8-0 pts
84Oregon County21.7-0.9 pts
85Worth County21.6+0.6 pts
86Cooper County21.6-0.3 pts
87Callaway County21.6-0 pts
88Randolph County21.6-0.1 pts
89Cape Girardeau County21.50 pts
90Douglas County21.5+0.2 pts
91Reynolds County21.5-0.2 pts
92Dade County21.30 pts
93Iron County21.3+0.2 pts
94Ste. Genevieve County21.2-0.3 pts
95St. Francois County21.2-0.1 pts
96Gasconade County21.2-0.3 pts
97Atchison County21+0.1 pts
98Holt County21-0.4 pts
99Greene County20.90 pts
100Phelps County20.8-0.2 pts
101Mississippi County20.7-0.4 pts
102Taney County20.7-0.3 pts
103Boone County20.7+0.1 pts
104Livingston County20.3-0.2 pts
105Wayne County20.2+0.3 pts
106St. Clair County20.1+0.3 pts
107Ozark County19.5+0.1 pts
108Adair County19.4+0.1 pts
109Nodaway County19.1+0.1 pts
110St. Louis city18.9-0.4 pts
111Camden County18.80 pts
112Benton County17.6-0.1 pts
113Stone County17.2-0.1 pts
114Hickory County16.8-0.2 pts
115DeKalb County16.8+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 Missouri by population under 18, 2017) [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 Missouri by population under 18, 2017. 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/missouri-counties?period=2017. 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 Missouri by population under 18, 2017. 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/missouri-counties?period=2017.

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 Missouri by population under 18, 2017 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/missouri-counties?period=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_missouri_by_2017,
  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 Missouri by population under 18, 2017}},
  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/missouri-counties?period=2017. 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 Missouri by population under 18, 2017
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/missouri-counties?period=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/missouri-counties?period=2017.
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 Missouri by population under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Scotland County, with 30% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

DeKalb County, with 16.8% in 2017.

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 Missouri: more rankings