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 2015, at 28.8%. Hickory County had the lowest, at 16.5%. The median was 23% and the figure for Missouri was 22.9%. Source: the U.S. Census Bureau.

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Highest28.8Scotland County
Lowest16.5Hickory County
Median23115 counties
Missouri22.9History

Map of counties, 2015

Adair County: 19.2 %Andrew County: 23.9 %Atchison County: 20.7 %Audrain County: 23.6 %Barry County: 23 %Barton County: 24.8 %Bates County: 23.9 %Benton County: 17.9 %Bollinger County: 22.5 %Boone County: 20.7 %Buchanan County: 22.6 %Butler County: 23.6 %Caldwell County: 24.1 %Callaway County: 21.6 %Camden County: 18.7 %Cape Girardeau County: 21.6 %Carroll County: 22.4 %Carter County: 23.3 %Cass County: 25.2 %Cedar County: 24.2 %Chariton County: 22.4 %Christian County: 26.6 %Clark County: 24.1 %Clay County: 25.2 %Clinton County: 24 %Cole County: 22.7 %Cooper County: 21.8 %Crawford County: 23.4 %Dade County: 21.2 %Dallas County: 23.4 %Daviess County: 26.1 %DeKalb County: 16.9 %Dent County: 22.9 %Douglas County: 21 %Dunklin County: 25.3 %Franklin County: 23.5 %Gasconade County: 21.4 %Gentry County: 24.5 %Greene County: 21 %Grundy County: 24 %Harrison County: 24.3 %Henry County: 22.4 %Hickory County: 16.5 %Holt County: 21.1 %Howard County: 22.3 %Howell County: 23.8 %Iron County: 21.5 %Jackson County: 23.7 %Jasper County: 25.5 %Jefferson County: 24.1 %Johnson County: 22.1 %Knox County: 24.2 %Laclede County: 24.3 %Lafayette County: 23.2 %Lawrence County: 25.4 %Lewis County: 22.1 %Lincoln County: 26.3 %Linn County: 23.9 %Livingston County: 21.1 %McDonald County: 26.2 %Macon County: 23.6 %Madison County: 23.4 %Maries County: 22.2 %Marion County: 23.4 %Mercer County: 24.6 %Miller County: 23.9 %Mississippi County: 21.5 %Moniteau County: 25.3 %Monroe County: 22.6 %Montgomery County: 22.6 %Morgan County: 22.1 %New Madrid County: 24 %Newton County: 24.4 %Nodaway County: 18.6 %Oregon County: 22.7 %Osage County: 23.4 %Ozark County: 19.7 %Pemiscot County: 26.6 %Perry County: 23.9 %Pettis County: 25.1 %Phelps County: 21 %Pike County: 22.3 %Platte County: 24 %Polk County: 24.1 %Pulaski County: 22.8 %Putnam County: 22 %Ralls County: 22.3 %Randolph County: 21.9 %Ray County: 23.3 %Reynolds County: 21.7 %Ripley County: 22.3 %St. Charles County: 24.4 %St. Clair County: 19.5 %Ste. Genevieve County: 21.7 %St. Francois County: 21.4 %St. Louis County: 22.3 %Saline County: 22.7 %Schuyler County: 26.5 %Scotland County: 28.8 %Scott County: 24.2 %Shannon County: 22.2 %Shelby County: 23.9 %Stoddard County: 22.7 %Stone County: 17.4 %Sullivan County: 23.7 %Taney County: 21.1 %Texas County: 21.8 %Vernon County: 24.2 %Warren County: 24.2 %Washington County: 22.8 %Wayne County: 20.4 %Webster County: 27.1 %Worth County: 21.2 %Wright County: 25.2 %St. Louis city: 19.7 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2015. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2015

Scotland County: 28.8 %Scotland County28.8Webster County: 27.1 %Webster County27.1Christian County: 26.6 %Christian County26.6Pemiscot County: 26.6 %Pemiscot County26.6Schuyler County: 26.5 %Schuyler County26.5Lincoln County: 26.3 %Lincoln County26.3McDonald County: 26.2 %McDonald County26.2Daviess County: 26.1 %Daviess County26.1Jasper County: 25.5 %Jasper County25.5Lawrence County: 25.4 %Lawrence County25.4Moniteau County: 25.3 %Moniteau County25.3Dunklin County: 25.3 %Dunklin County25.3Wright County: 25.2 %Wright County25.2Clay County: 25.2 %Clay County25.2Cass County: 25.2 %Cass County25.2Pettis County: 25.1 %Pettis County25.1Barton County: 24.8 %Barton County24.8Mercer County: 24.6 %Mercer County24.6Gentry County: 24.5 %Gentry County24.5St. Charles County: 24.4 %St. Charles County24.4Newton County: 24.4 %Newton County24.4Harrison County: 24.3 %Harrison County24.3Laclede County: 24.3 %Laclede County24.3Vernon County: 24.2 %Vernon County24.2Warren County: 24.2 %Warren County24.2Cedar County: 24.2 %Cedar County24.2Knox County: 24.2 %Knox County24.2Scott County: 24.2 %Scott County24.2Clark County: 24.1 %Clark County24.1Caldwell County: 24.1 %Caldwell County24.1Jefferson County: 24.1 %Jefferson County24.1Polk County: 24.1 %Polk County24.1Platte County: 24 %Platte County24Grundy County: 24 %Grundy County24Clinton County: 24 %Clinton County24New Madrid County: 24 %New Madrid County24Andrew County: 23.9 %Andrew County23.9Bates County: 23.9 %Bates County23.9Miller County: 23.9 %Miller County23.9Perry County: 23.9 %Perry County23.9Scotland County: 28.8 %Scotland County28.8Webster County: 27.1 %Webster County27.1Christian County: 26.6 %Christian County26.6Pemiscot County: 26.6 %Pemiscot County26.6Schuyler County: 26.5 %Schuyler County26.5Lincoln County: 26.3 %Lincoln County26.3McDonald County: 26.2 %McDonald County26.2Daviess County: 26.1 %Daviess County26.1Jasper County: 25.5 %Jasper County25.5Lawrence County: 25.4 %Lawrence County25.4Moniteau County: 25.3 %Moniteau County25.3Dunklin County: 25.3 %Dunklin County25.3Wright County: 25.2 %Wright County25.2Clay County: 25.2 %Clay County25.2Cass County: 25.2 %Cass County25.2Pettis County: 25.1 %Pettis County25.1Barton County: 24.8 %Barton County24.8Mercer County: 24.6 %Mercer County24.6Gentry County: 24.5 %Gentry County24.5St. Charles County: 24.4 %St. Charles County24.4Newton County: 24.4 %Newton County24.4Harrison County: 24.3 %Harrison County24.3Laclede County: 24.3 %Laclede County24.3Vernon County: 24.2 %Vernon County24.2Warren County: 24.2 %Warren County24.2Cedar County: 24.2 %Cedar County24.2Knox County: 24.2 %Knox County24.2Scott County: 24.2 %Scott County24.2Clark County: 24.1 %Clark County24.1Caldwell County: 24.1 %Caldwell County24.1Jefferson County: 24.1 %Jefferson County24.1Polk County: 24.1 %Polk County24.1Platte County: 24 %Platte County24Grundy County: 24 %Grundy County24Clinton County: 24 %Clinton County24New Madrid County: 24 %New Madrid County24Andrew County: 23.9 %Andrew County23.9Bates County: 23.9 %Bates County23.9Miller County: 23.9 %Miller County23.9Perry County: 23.9 %Perry County23.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1Scotland County28.8-0.1 pts
2Webster County27.1-0 pts
3Christian County26.60 pts
4Pemiscot County26.6-0.2 pts
5Schuyler County26.5+0.7 pts
6Lincoln County26.3-0.3 pts
7McDonald County26.2-0.3 pts
8Daviess County26.1-0.3 pts
9Jasper County25.5-0.1 pts
10Lawrence County25.4-0.1 pts
11Moniteau County25.3+0.1 pts
12Dunklin County25.3-0.4 pts
13Wright County25.2+0.1 pts
14Clay County25.2-0.1 pts
15Cass County25.2-0.2 pts
16Pettis County25.10 pts
17Barton County24.8-0.4 pts
18Mercer County24.6+0.2 pts
19Gentry County24.5-0.2 pts
20St. Charles County24.4-0.2 pts
21Newton County24.4-0.3 pts
22Harrison County24.3+0.1 pts
23Laclede County24.3-0.1 pts
24Vernon County24.2-0.3 pts
25Warren County24.2-0.1 pts
26Cedar County24.2+0.6 pts
27Knox County24.2-0.2 pts
28Scott County24.2+0.2 pts
29Clark County24.1+0.4 pts
30Caldwell County24.1+0.2 pts
30Jefferson County24.1-0.2 pts
32Polk County24.10 pts
33Platte County24-0 pts
34Grundy County24-0.1 pts
35Clinton County24+0.2 pts
36New Madrid County24-0 pts
37Andrew County23.9+0.4 pts
38Bates County23.9-0.1 pts
39Miller County23.9+0.1 pts
40Perry County23.9-0.2 pts
41Shelby County23.9+0.5 pts
42Linn County23.9+0.1 pts
43Howell County23.8-0.3 pts
44Jackson County23.7-0.1 pts
45Sullivan County23.70 pts
46Audrain County23.6-0.2 pts
47Macon County23.6-0.2 pts
48Butler County23.6+0.1 pts
49Franklin County23.5-0.2 pts
50Osage County23.4-0.3 pts
51Madison County23.4-0 pts
52Dallas County23.40 pts
53Marion County23.4-0.1 pts
54Crawford County23.4-0.2 pts
55Ray County23.3-0.3 pts
56Carter County23.3+0.2 pts
57Lafayette County23.2-0 pts
58Barry County23-0.1 pts
59Dent County22.9+0.1 pts
60Washington County22.8-0.2 pts
61Pulaski County22.8-0.2 pts
62Oregon County22.7+0.6 pts
63Saline County22.7-0.2 pts
64Stoddard County22.7+0.2 pts
65Cole County22.7-0.2 pts
66Buchanan County22.6-0.2 pts
67Monroe County22.6-0.2 pts
68Montgomery County22.6-0.3 pts
69Bollinger County22.5-0.1 pts
70Henry County22.4-0.1 pts
71Carroll County22.4-0.4 pts
72Chariton County22.4+0.2 pts
73Ralls County22.3-0.1 pts
74Pike County22.3+0.4 pts
75Ripley County22.3-0.2 pts
76Howard County22.3+0.5 pts
77St. Louis County22.3-0.1 pts
78Maries County22.2-0.3 pts
79Shannon County22.2-0.3 pts
80Morgan County22.1+0.1 pts
81Johnson County22.1-0.2 pts
81Lewis County22.1-0.3 pts
83Putnam County22+0.6 pts
84Randolph County21.9-0.1 pts
85Cooper County21.8-0 pts
86Texas County21.8+0.2 pts
87Ste. Genevieve County21.7-0.2 pts
88Reynolds County21.7-0.1 pts
89Callaway County21.6-0.2 pts
90Cape Girardeau County21.60 pts
91Iron County21.5-0.4 pts
92Mississippi County21.5-0.6 pts
93Gasconade County21.4-0.1 pts
94St. Francois County21.4-0.1 pts
95Worth County21.2-0 pts
96Dade County21.2-0 pts
97Holt County21.1+0.5 pts
98Taney County21.1+0.1 pts
99Livingston County21.1+0.1 pts
100Greene County21-0.1 pts
101Douglas County21-0.5 pts
102Phelps County21+0.1 pts
103Atchison County20.7+0.5 pts
104Boone County20.7-0.1 pts
105Wayne County20.4+0.1 pts
106Ozark County19.7-0.3 pts
107St. Louis city19.7-0.3 pts
108St. Clair County19.5+0.1 pts
109Adair County19.20 pts
110Camden County18.7-0.1 pts
111Nodaway County18.6-0.1 pts
112Benton County17.9-0.1 pts
113Stone County17.4-0.3 pts
114DeKalb County16.9-0 pts
115Hickory County16.5-0.4 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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_missouri_by_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/missouri-counties?period=2015.
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?

Scotland County, with 28.8% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Hickory County, with 16.5% in 2015.

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