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 2019, at 30.1%. Hickory County had the lowest, at 16.3%. The median was 22.7% and the figure for Missouri was 22.5%. Source: the U.S. Census Bureau.

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Highest30.1Scotland County
Lowest16.3Hickory County
Median22.7115 counties
Missouri22.5History

Map of counties, 2019

Adair County: 19.3 %Andrew County: 24.3 %Atchison County: 21.4 %Audrain County: 23.4 %Barry County: 23.1 %Barton County: 24.2 %Bates County: 22.9 %Benton County: 17.9 %Bollinger County: 21.7 %Boone County: 20.9 %Buchanan County: 22 %Butler County: 23.4 %Caldwell County: 23.2 %Callaway County: 21.6 %Camden County: 18.6 %Cape Girardeau County: 21.3 %Carroll County: 22.2 %Carter County: 21.6 %Cass County: 24.4 %Cedar County: 24.9 %Chariton County: 22.4 %Christian County: 26.1 %Clark County: 23.8 %Clay County: 24.6 %Clinton County: 23.6 %Cole County: 22 %Cooper County: 21.8 %Crawford County: 22.5 %Dade County: 21 %Dallas County: 23.8 %Daviess County: 25.8 %DeKalb County: 19.5 %Dent County: 21.8 %Douglas County: 21.7 %Dunklin County: 24.7 %Franklin County: 22.7 %Gasconade County: 21.1 %Gentry County: 25 %Greene County: 20.7 %Grundy County: 24.9 %Harrison County: 23.7 %Henry County: 21.9 %Hickory County: 16.3 %Holt County: 21.6 %Howard County: 22.1 %Howell County: 23.6 %Iron County: 21.3 %Jackson County: 23 %Jasper County: 25 %Jefferson County: 23.2 %Johnson County: 22.6 %Knox County: 23.8 %Laclede County: 23.9 %Lafayette County: 23 %Lawrence County: 25.3 %Lewis County: 21.1 %Lincoln County: 25.7 %Linn County: 23.1 %Livingston County: 20.6 %McDonald County: 26.2 %Macon County: 23.2 %Madison County: 23 %Maries County: 21.6 %Marion County: 23 %Mercer County: 23 %Miller County: 23.5 %Mississippi County: 20.4 %Moniteau County: 25.2 %Monroe County: 22.2 %Montgomery County: 22.1 %Morgan County: 23 %New Madrid County: 23.7 %Newton County: 23.5 %Nodaway County: 19.5 %Oregon County: 21.7 %Osage County: 23 %Ozark County: 19.3 %Pemiscot County: 25.6 %Perry County: 23 %Pettis County: 25 %Phelps County: 20.6 %Pike County: 22.8 %Platte County: 23.9 %Polk County: 23.8 %Pulaski County: 22.5 %Putnam County: 21.9 %Ralls County: 22.3 %Randolph County: 21.4 %Ray County: 23.2 %Reynolds County: 21.7 %Ripley County: 22.2 %St. Charles County: 23.5 %St. Clair County: 20.4 %Ste. Genevieve County: 21.4 %St. Francois County: 20.9 %St. Louis County: 22 %Saline County: 22.2 %Schuyler County: 25.7 %Scotland County: 30.1 %Scott County: 24 %Shannon County: 21.5 %Shelby County: 24.5 %Stoddard County: 22.4 %Stone County: 17.1 %Sullivan County: 23.4 %Taney County: 20.2 %Texas County: 21.8 %Vernon County: 24.2 %Warren County: 23.4 %Washington County: 22.4 %Wayne County: 19.5 %Webster County: 26.8 %Worth County: 21.2 %Wright County: 25.5 %St. Louis city: 18.2 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2019. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2019

Scotland County: 30.1 %Scotland County30.1Webster County: 26.8 %Webster County26.8McDonald County: 26.2 %McDonald County26.2Christian County: 26.1 %Christian County26.1Daviess County: 25.8 %Daviess County25.8Schuyler County: 25.7 %Schuyler County25.7Lincoln County: 25.7 %Lincoln County25.7Pemiscot County: 25.6 %Pemiscot County25.6Wright County: 25.5 %Wright County25.5Lawrence County: 25.3 %Lawrence County25.3Moniteau County: 25.2 %Moniteau County25.2Gentry County: 25 %Gentry County25Pettis County: 25 %Pettis County25Jasper County: 25 %Jasper County25Grundy County: 24.9 %Grundy County24.9Cedar County: 24.9 %Cedar County24.9Dunklin County: 24.7 %Dunklin County24.7Clay County: 24.6 %Clay County24.6Shelby County: 24.5 %Shelby County24.5Cass County: 24.4 %Cass County24.4Andrew County: 24.3 %Andrew County24.3Barton County: 24.2 %Barton County24.2Vernon County: 24.2 %Vernon County24.2Scott County: 24 %Scott County24Platte County: 23.9 %Platte County23.9Laclede County: 23.9 %Laclede County23.9Polk County: 23.8 %Polk County23.8Clark County: 23.8 %Clark County23.8Knox County: 23.8 %Knox County23.8Dallas County: 23.8 %Dallas County23.8New Madrid County: 23.7 %New Madrid County23.7Harrison County: 23.7 %Harrison County23.7Howell County: 23.6 %Howell County23.6Clinton County: 23.6 %Clinton County23.6Newton County: 23.5 %Newton County23.5St. Charles County: 23.5 %St. Charles County23.5Miller County: 23.5 %Miller County23.5Audrain County: 23.4 %Audrain County23.4Sullivan County: 23.4 %Sullivan County23.4Butler County: 23.4 %Butler County23.4Scotland County: 30.1 %Scotland County30.1Webster County: 26.8 %Webster County26.8McDonald County: 26.2 %McDonald County26.2Christian County: 26.1 %Christian County26.1Daviess County: 25.8 %Daviess County25.8Schuyler County: 25.7 %Schuyler County25.7Lincoln County: 25.7 %Lincoln County25.7Pemiscot County: 25.6 %Pemiscot County25.6Wright County: 25.5 %Wright County25.5Lawrence County: 25.3 %Lawrence County25.3Moniteau County: 25.2 %Moniteau County25.2Gentry County: 25 %Gentry County25Pettis County: 25 %Pettis County25Jasper County: 25 %Jasper County25Grundy County: 24.9 %Grundy County24.9Cedar County: 24.9 %Cedar County24.9Dunklin County: 24.7 %Dunklin County24.7Clay County: 24.6 %Clay County24.6Shelby County: 24.5 %Shelby County24.5Cass County: 24.4 %Cass County24.4Andrew County: 24.3 %Andrew County24.3Barton County: 24.2 %Barton County24.2Vernon County: 24.2 %Vernon County24.2Scott County: 24 %Scott County24Platte County: 23.9 %Platte County23.9Laclede County: 23.9 %Laclede County23.9Polk County: 23.8 %Polk County23.8Clark County: 23.8 %Clark County23.8Knox County: 23.8 %Knox County23.8Dallas County: 23.8 %Dallas County23.8New Madrid County: 23.7 %New Madrid County23.7Harrison County: 23.7 %Harrison County23.7Howell County: 23.6 %Howell County23.6Clinton County: 23.6 %Clinton County23.6Newton County: 23.5 %Newton County23.5St. Charles County: 23.5 %St. Charles County23.5Miller County: 23.5 %Miller County23.5Audrain County: 23.4 %Audrain County23.4Sullivan County: 23.4 %Sullivan County23.4Butler County: 23.4 %Butler County23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Scotland County30.1-0.2 pts
2Webster County26.8-0.3 pts
3McDonald County26.2-0.1 pts
4Christian County26.1-0 pts
5Daviess County25.8-0.2 pts
6Schuyler County25.7+0.2 pts
7Lincoln County25.7-0 pts
8Pemiscot County25.6-0.1 pts
9Wright County25.50 pts
10Lawrence County25.3+0.1 pts
11Moniteau County25.2+0.1 pts
12Gentry County25+0.3 pts
13Pettis County25+0.1 pts
14Jasper County25-0.2 pts
15Grundy County24.90 pts
16Cedar County24.9+0.3 pts
17Dunklin County24.7-0.3 pts
18Clay County24.6-0.1 pts
19Shelby County24.5+0.1 pts
20Cass County24.4-0.2 pts
21Andrew County24.3+0.2 pts
22Barton County24.20 pts
23Vernon County24.2-0.2 pts
24Scott County24-0.2 pts
25Platte County23.9-0.3 pts
26Laclede County23.9-0.2 pts
27Polk County23.8-0.1 pts
28Clark County23.8-0.4 pts
29Knox County23.80 pts
30Dallas County23.8+0.2 pts
31New Madrid County23.70 pts
32Harrison County23.7+0.1 pts
33Howell County23.6-0.1 pts
34Clinton County23.6-0.1 pts
35Newton County23.5-0.2 pts
36St. Charles County23.5-0.2 pts
37Miller County23.5+0.1 pts
38Audrain County23.40 pts
39Sullivan County23.4-0.1 pts
40Butler County23.4-0.1 pts
41Warren County23.4-0.1 pts
42Jefferson County23.2-0.2 pts
43Caldwell County23.2-0.4 pts
44Macon County23.2-0.2 pts
45Ray County23.2-0 pts
46Barry County23.1-0 pts
47Linn County23.1-0.4 pts
48Osage County23-0.1 pts
49Perry County23-0.3 pts
50Marion County23-0.2 pts
51Madison County23-0.1 pts
52Lafayette County23+0.2 pts
53Mercer County23-0.1 pts
54Jackson County23-0.2 pts
55Morgan County23+0.1 pts
56Bates County22.9-0.6 pts
57Pike County22.8+0.6 pts
58Franklin County22.7-0.3 pts
59Johnson County22.6+0.3 pts
60Pulaski County22.5+0.1 pts
61Crawford County22.5-0.1 pts
62Washington County22.4-0.2 pts
63Chariton County22.4+0.2 pts
64Stoddard County22.4-0 pts
65Ralls County22.3-0.1 pts
66Ripley County22.2+0.2 pts
67Saline County22.2-0.1 pts
68Carroll County22.2-0.3 pts
69Monroe County22.2-0 pts
70Montgomery County22.1-0 pts
71Howard County22.1-0 pts
72Buchanan County22-0.2 pts
73Cole County22-0.1 pts
74St. Louis County22-0.1 pts
75Putnam County21.9+0.2 pts
76Henry County21.90 pts
77Dent County21.8-0.3 pts
78Texas County21.8-0 pts
79Cooper County21.8+0.3 pts
80Oregon County21.7-0.3 pts
81Reynolds County21.7+0.4 pts
82Douglas County21.7-0.1 pts
83Bollinger County21.7-0.2 pts
84Holt County21.6+0.1 pts
85Maries County21.60 pts
86Carter County21.6-0.4 pts
87Callaway County21.6-0.1 pts
88Shannon County21.5-0.5 pts
89Atchison County21.4+0.5 pts
90Randolph County21.4-0.3 pts
91Ste. Genevieve County21.4+0.2 pts
92Cape Girardeau County21.3-0.1 pts
93Iron County21.3-0.2 pts
94Worth County21.2-0.4 pts
95Gasconade County21.1+0.1 pts
96Lewis County21.1-0.5 pts
97Dade County21+0.5 pts
98Boone County20.9+0.2 pts
99St. Francois County20.9-0.1 pts
100Greene County20.7-0.1 pts
101Livingston County20.6+0.5 pts
102Phelps County20.6-0.1 pts
103St. Clair County20.4+0.1 pts
104Mississippi County20.4-0.2 pts
105Taney County20.2-0.3 pts
106Wayne County19.5-0.5 pts
107Nodaway County19.5+0.4 pts
108DeKalb County19.5+2.7 pts
109Ozark County19.3+0.1 pts
110Adair County19.3-0.1 pts
111Camden County18.6-0.1 pts
112St. Louis city18.2-0.3 pts
113Benton County17.9+0.1 pts
114Stone County17.1-0 pts
115Hickory County16.3-0.5 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 Missouri 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 Missouri 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/missouri-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 Missouri 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/missouri-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 Missouri 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/missouri-counties?period=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_missouri_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 Missouri 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/missouri-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 Missouri 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/missouri-counties?period=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/missouri-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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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 30.1% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Hickory County, with 16.3% 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 Missouri: more rankings