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 2018, at 30.3%. Hickory County had the lowest, at 16.7%. The median was 22.6% and the figure for Missouri was 22.6%. Source: the U.S. Census Bureau.

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Highest30.3Scotland County
Lowest16.7Hickory County
Median22.6115 counties
Missouri22.6History

Map of counties, 2018

Adair County: 19.3 %Andrew County: 24.1 %Atchison County: 20.9 %Audrain County: 23.4 %Barry County: 23.1 %Barton County: 24.2 %Bates County: 23.4 %Benton County: 17.8 %Bollinger County: 21.8 %Boone County: 20.8 %Buchanan County: 22.3 %Butler County: 23.5 %Caldwell County: 23.7 %Callaway County: 21.6 %Camden County: 18.7 %Cape Girardeau County: 21.5 %Carroll County: 22.5 %Carter County: 22 %Cass County: 24.6 %Cedar County: 24.6 %Chariton County: 22.2 %Christian County: 26.1 %Clark County: 24.2 %Clay County: 24.7 %Clinton County: 23.6 %Cole County: 22.1 %Cooper County: 21.4 %Crawford County: 22.6 %Dade County: 20.5 %Dallas County: 23.6 %Daviess County: 26 %DeKalb County: 16.8 %Dent County: 22.1 %Douglas County: 21.8 %Dunklin County: 25 %Franklin County: 23 %Gasconade County: 21.1 %Gentry County: 24.8 %Greene County: 20.8 %Grundy County: 24.9 %Harrison County: 23.6 %Henry County: 21.9 %Hickory County: 16.7 %Holt County: 21.6 %Howard County: 22.1 %Howell County: 23.7 %Iron County: 21.4 %Jackson County: 23.2 %Jasper County: 25.2 %Jefferson County: 23.5 %Johnson County: 22.3 %Knox County: 23.8 %Laclede County: 24.1 %Lafayette County: 22.8 %Lawrence County: 25.2 %Lewis County: 21.6 %Lincoln County: 25.7 %Linn County: 23.5 %Livingston County: 20.2 %McDonald County: 26.3 %Macon County: 23.4 %Madison County: 23.1 %Maries County: 21.6 %Marion County: 23.2 %Mercer County: 23.1 %Miller County: 23.4 %Mississippi County: 20.6 %Moniteau County: 25 %Monroe County: 22.2 %Montgomery County: 22.1 %Morgan County: 22.9 %New Madrid County: 23.7 %Newton County: 23.7 %Nodaway County: 19.1 %Oregon County: 22 %Osage County: 23.1 %Ozark County: 19.3 %Pemiscot County: 25.7 %Perry County: 23.3 %Pettis County: 24.9 %Phelps County: 20.7 %Pike County: 22.2 %Platte County: 24.2 %Polk County: 23.9 %Pulaski County: 22.4 %Putnam County: 21.7 %Ralls County: 22.4 %Randolph County: 21.7 %Ray County: 23.2 %Reynolds County: 21.3 %Ripley County: 22 %St. Charles County: 23.7 %St. Clair County: 20.4 %Ste. Genevieve County: 21.2 %St. Francois County: 21 %St. Louis County: 22.1 %Saline County: 22.4 %Schuyler County: 25.5 %Scotland County: 30.3 %Scott County: 24.1 %Shannon County: 22 %Shelby County: 24.4 %Stoddard County: 22.4 %Stone County: 17.1 %Sullivan County: 23.5 %Taney County: 20.5 %Texas County: 21.8 %Vernon County: 24.4 %Warren County: 23.4 %Washington County: 22.6 %Wayne County: 20.1 %Webster County: 27.1 %Worth County: 21.6 %Wright County: 25.4 %St. Louis city: 18.5 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2018. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2018

Scotland County: 30.3 %Scotland County30.3Webster County: 27.1 %Webster County27.1McDonald County: 26.3 %McDonald County26.3Christian County: 26.1 %Christian County26.1Daviess County: 26 %Daviess County26Pemiscot County: 25.7 %Pemiscot County25.7Lincoln County: 25.7 %Lincoln County25.7Schuyler County: 25.5 %Schuyler County25.5Wright County: 25.4 %Wright County25.4Jasper County: 25.2 %Jasper County25.2Lawrence County: 25.2 %Lawrence County25.2Moniteau County: 25 %Moniteau County25Dunklin County: 25 %Dunklin County25Pettis County: 24.9 %Pettis County24.9Grundy County: 24.9 %Grundy County24.9Gentry County: 24.8 %Gentry County24.8Clay County: 24.7 %Clay County24.7Cedar County: 24.6 %Cedar County24.6Cass County: 24.6 %Cass County24.6Shelby County: 24.4 %Shelby County24.4Vernon County: 24.4 %Vernon County24.4Barton County: 24.2 %Barton County24.2Clark County: 24.2 %Clark County24.2Platte County: 24.2 %Platte County24.2Scott County: 24.1 %Scott County24.1Andrew County: 24.1 %Andrew County24.1Laclede County: 24.1 %Laclede County24.1Polk County: 23.9 %Polk County23.9Knox County: 23.8 %Knox County23.8St. Charles County: 23.7 %St. Charles County23.7New Madrid County: 23.7 %New Madrid County23.7Newton County: 23.7 %Newton County23.7Howell County: 23.7 %Howell County23.7Caldwell County: 23.7 %Caldwell County23.7Clinton County: 23.6 %Clinton County23.6Harrison County: 23.6 %Harrison County23.6Dallas County: 23.6 %Dallas County23.6Sullivan County: 23.5 %Sullivan County23.5Butler County: 23.5 %Butler County23.5Linn County: 23.5 %Linn County23.5Scotland County: 30.3 %Scotland County30.3Webster County: 27.1 %Webster County27.1McDonald County: 26.3 %McDonald County26.3Christian County: 26.1 %Christian County26.1Daviess County: 26 %Daviess County26Pemiscot County: 25.7 %Pemiscot County25.7Lincoln County: 25.7 %Lincoln County25.7Schuyler County: 25.5 %Schuyler County25.5Wright County: 25.4 %Wright County25.4Jasper County: 25.2 %Jasper County25.2Lawrence County: 25.2 %Lawrence County25.2Moniteau County: 25 %Moniteau County25Dunklin County: 25 %Dunklin County25Pettis County: 24.9 %Pettis County24.9Grundy County: 24.9 %Grundy County24.9Gentry County: 24.8 %Gentry County24.8Clay County: 24.7 %Clay County24.7Cedar County: 24.6 %Cedar County24.6Cass County: 24.6 %Cass County24.6Shelby County: 24.4 %Shelby County24.4Vernon County: 24.4 %Vernon County24.4Barton County: 24.2 %Barton County24.2Clark County: 24.2 %Clark County24.2Platte County: 24.2 %Platte County24.2Scott County: 24.1 %Scott County24.1Andrew County: 24.1 %Andrew County24.1Laclede County: 24.1 %Laclede County24.1Polk County: 23.9 %Polk County23.9Knox County: 23.8 %Knox County23.8St. Charles County: 23.7 %St. Charles County23.7New Madrid County: 23.7 %New Madrid County23.7Newton County: 23.7 %Newton County23.7Howell County: 23.7 %Howell County23.7Caldwell County: 23.7 %Caldwell County23.7Clinton County: 23.6 %Clinton County23.6Harrison County: 23.6 %Harrison County23.6Dallas County: 23.6 %Dallas County23.6Sullivan County: 23.5 %Sullivan County23.5Butler County: 23.5 %Butler County23.5Linn County: 23.5 %Linn County23.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Scotland County30.3+0.3 pts
2Webster County27.1-0.1 pts
3McDonald County26.3+0.1 pts
4Christian County26.1-0.1 pts
5Daviess County26-0.1 pts
6Pemiscot County25.7-0.4 pts
7Lincoln County25.7-0.1 pts
8Schuyler County25.5-0.5 pts
9Wright County25.4+0.1 pts
10Jasper County25.2-0.1 pts
11Lawrence County25.2-0.1 pts
12Moniteau County25-0.2 pts
13Dunklin County25-0.2 pts
14Pettis County24.9-0.1 pts
15Grundy County24.9+0.3 pts
16Gentry County24.8-0 pts
17Clay County24.7-0.1 pts
18Cedar County24.6+0.1 pts
19Cass County24.6-0.2 pts
20Shelby County24.4-0.1 pts
21Vernon County24.40 pts
22Barton County24.2-0.4 pts
23Clark County24.2+0.5 pts
24Platte County24.2-0.1 pts
25Scott County24.1+0.2 pts
26Andrew County24.1+0.1 pts
27Laclede County24.1-0.1 pts
28Polk County23.9+0.1 pts
29Knox County23.8-0.3 pts
30St. Charles County23.7-0.3 pts
31New Madrid County23.7+0.4 pts
32Newton County23.7-0.2 pts
33Howell County23.7-0.1 pts
34Caldwell County23.7-0.1 pts
35Clinton County23.6-0.2 pts
36Harrison County23.6-0.4 pts
37Dallas County23.6-0.3 pts
38Sullivan County23.5-0 pts
39Butler County23.5-0.1 pts
40Linn County23.5-0.3 pts
41Jefferson County23.5-0.2 pts
42Audrain County23.4+0.2 pts
43Bates County23.4-0.3 pts
44Warren County23.4-0.4 pts
45Miller County23.4-0 pts
46Macon County23.4-0.1 pts
47Perry County23.3-0.1 pts
48Marion County23.20 pts
49Jackson County23.2-0.2 pts
50Ray County23.2-0.1 pts
51Barry County23.1-0.1 pts
52Mercer County23.1-0.2 pts
53Madison County23.10 pts
54Osage County23.1-0.1 pts
55Franklin County23-0.3 pts
56Morgan County22.9+0.4 pts
57Lafayette County22.80 pts
58Crawford County22.6-0.3 pts
59Washington County22.6-0.2 pts
60Carroll County22.5+0.2 pts
61Stoddard County22.40 pts
62Ralls County22.4-0.2 pts
63Pulaski County22.4-0.1 pts
64Saline County22.4-0.2 pts
65Johnson County22.3+0.1 pts
66Buchanan County22.3-0.3 pts
67Monroe County22.2-0.2 pts
68Chariton County22.2-0.3 pts
69Pike County22.20 pts
70Howard County22.1+0.3 pts
71Dent County22.1+0.1 pts
72Cole County22.1-0.2 pts
73Montgomery County22.1-0.1 pts
74St. Louis County22.1-0.1 pts
75Ripley County22-0.2 pts
76Oregon County22+0.3 pts
77Shannon County22+0.1 pts
78Carter County22-0.7 pts
79Henry County21.9-0.4 pts
80Bollinger County21.8-0.4 pts
81Douglas County21.8+0.3 pts
82Texas County21.8-0.1 pts
83Putnam County21.7-0.3 pts
84Randolph County21.7+0.1 pts
85Lewis County21.6-0.2 pts
86Callaway County21.6+0.1 pts
87Worth County21.6-0 pts
88Maries County21.6-0.4 pts
89Holt County21.6+0.6 pts
90Cape Girardeau County21.5-0.1 pts
91Iron County21.4+0.2 pts
92Cooper County21.4-0.2 pts
93Reynolds County21.3-0.2 pts
94Ste. Genevieve County21.20 pts
95Gasconade County21.1-0.1 pts
96St. Francois County21-0.2 pts
97Atchison County20.9-0 pts
98Greene County20.8-0.1 pts
99Boone County20.8+0.1 pts
100Phelps County20.7-0.1 pts
101Mississippi County20.6-0.1 pts
102Dade County20.5-0.8 pts
103Taney County20.5-0.2 pts
104St. Clair County20.4+0.3 pts
105Livingston County20.2-0.1 pts
106Wayne County20.1-0.1 pts
107Adair County19.3-0.1 pts
108Ozark County19.3-0.2 pts
109Nodaway County19.10 pts
110Camden County18.7-0.1 pts
111St. Louis city18.5-0.4 pts
112Benton County17.8+0.3 pts
113Stone County17.1-0.1 pts
114DeKalb County16.80 pts
115Hickory County16.7-0.1 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, 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 Missouri 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/missouri-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 Missouri 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/missouri-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 Missouri 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/missouri-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_missouri_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 Missouri 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/missouri-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 Missouri 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/missouri-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/missouri-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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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 30.3% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Hickory County, with 16.7% 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 Missouri: more rankings