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 2020, at 29.9%. Hickory County had the lowest, at 17%. The median was 22.8% and the figure for Missouri was 22.5%. Source: the U.S. Census Bureau.

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Highest29.9Scotland County
Lowest17Hickory County
Median22.8115 counties
Missouri22.5History

Map of counties, 2020

Adair County: 19 %Andrew County: 24 %Atchison County: 20.9 %Audrain County: 23.6 %Barry County: 23.1 %Barton County: 24.3 %Bates County: 23 %Benton County: 18 %Bollinger County: 22.5 %Boone County: 20.9 %Buchanan County: 22.4 %Butler County: 23.3 %Caldwell County: 23.4 %Callaway County: 21.7 %Camden County: 18.4 %Cape Girardeau County: 21.3 %Carroll County: 21.5 %Carter County: 22.6 %Cass County: 24.2 %Cedar County: 24.9 %Chariton County: 22.4 %Christian County: 25.9 %Clark County: 23.6 %Clay County: 24.4 %Clinton County: 23.3 %Cole County: 22.4 %Cooper County: 22.8 %Crawford County: 22.9 %Dade County: 21.6 %Dallas County: 24 %Daviess County: 25.6 %DeKalb County: 18.1 %Dent County: 22.5 %Douglas County: 22.4 %Dunklin County: 25.1 %Franklin County: 22.5 %Gasconade County: 20.9 %Gentry County: 25.8 %Greene County: 20.6 %Grundy County: 25.2 %Harrison County: 23.5 %Henry County: 22.1 %Hickory County: 17 %Holt County: 21.4 %Howard County: 22.3 %Howell County: 24.1 %Iron County: 21.4 %Jackson County: 22.9 %Jasper County: 24.8 %Jefferson County: 23.1 %Johnson County: 22.4 %Knox County: 24 %Laclede County: 24.3 %Lafayette County: 23.1 %Lawrence County: 25.5 %Lewis County: 21.2 %Lincoln County: 25.6 %Linn County: 23 %Livingston County: 21.3 %McDonald County: 26.3 %Macon County: 23.1 %Madison County: 22.7 %Maries County: 21.5 %Marion County: 23.1 %Mercer County: 23.3 %Miller County: 23.8 %Mississippi County: 21.5 %Moniteau County: 25.9 %Monroe County: 22.2 %Montgomery County: 21.9 %Morgan County: 22.8 %New Madrid County: 23.8 %Newton County: 23.9 %Nodaway County: 19.5 %Oregon County: 22.8 %Osage County: 22.8 %Ozark County: 18.7 %Pemiscot County: 26 %Perry County: 23 %Pettis County: 25.2 %Phelps County: 20.8 %Pike County: 23.2 %Platte County: 23.9 %Polk County: 24 %Pulaski County: 22.6 %Putnam County: 22 %Ralls County: 21.6 %Randolph County: 21.5 %Ray County: 23 %Reynolds County: 21.3 %Ripley County: 23.9 %St. Charles County: 23.3 %St. Clair County: 21.6 %Ste. Genevieve County: 21.4 %St. Francois County: 21.1 %St. Louis County: 22.1 %Saline County: 22.1 %Schuyler County: 26.7 %Scotland County: 29.9 %Scott County: 24.2 %Shannon County: 22.3 %Shelby County: 24.3 %Stoddard County: 22.6 %Stone County: 17.2 %Sullivan County: 23.7 %Taney County: 20.6 %Texas County: 22 %Vernon County: 24.3 %Warren County: 23.4 %Washington County: 22.6 %Wayne County: 20.2 %Webster County: 27.5 %Worth County: 19.6 %Wright County: 26 %St. Louis city: 18.4 %
  • Under 21
  • 21 to 22
  • 22 to 23
  • 23 to 24
  • 24 and over
%, 2020. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2020

Scotland County: 29.9 %Scotland County29.9Webster County: 27.5 %Webster County27.5Schuyler County: 26.7 %Schuyler County26.7McDonald County: 26.3 %McDonald County26.3Wright County: 26 %Wright County26Pemiscot County: 26 %Pemiscot County26Moniteau County: 25.9 %Moniteau County25.9Christian County: 25.9 %Christian County25.9Gentry County: 25.8 %Gentry County25.8Daviess County: 25.6 %Daviess County25.6Lincoln County: 25.6 %Lincoln County25.6Lawrence County: 25.5 %Lawrence County25.5Grundy County: 25.2 %Grundy County25.2Pettis County: 25.2 %Pettis County25.2Dunklin County: 25.1 %Dunklin County25.1Cedar County: 24.9 %Cedar County24.9Jasper County: 24.8 %Jasper County24.8Clay County: 24.4 %Clay County24.4Barton County: 24.3 %Barton County24.3Vernon County: 24.3 %Vernon County24.3Shelby County: 24.3 %Shelby County24.3Laclede County: 24.3 %Laclede County24.3Cass County: 24.2 %Cass County24.2Scott County: 24.2 %Scott County24.2Howell County: 24.1 %Howell County24.1Polk County: 24 %Polk County24Andrew County: 24 %Andrew County24Dallas County: 24 %Dallas County24Knox County: 24 %Knox County24Ripley County: 23.9 %Ripley County23.9Newton County: 23.9 %Newton County23.9Platte County: 23.9 %Platte County23.9Miller County: 23.8 %Miller County23.8New Madrid County: 23.8 %New Madrid County23.8Sullivan County: 23.7 %Sullivan County23.7Audrain County: 23.6 %Audrain County23.6Clark County: 23.6 %Clark County23.6Harrison County: 23.5 %Harrison County23.5Warren County: 23.4 %Warren County23.4Caldwell County: 23.4 %Caldwell County23.4Scotland County: 29.9 %Scotland County29.9Webster County: 27.5 %Webster County27.5Schuyler County: 26.7 %Schuyler County26.7McDonald County: 26.3 %McDonald County26.3Wright County: 26 %Wright County26Pemiscot County: 26 %Pemiscot County26Moniteau County: 25.9 %Moniteau County25.9Christian County: 25.9 %Christian County25.9Gentry County: 25.8 %Gentry County25.8Daviess County: 25.6 %Daviess County25.6Lincoln County: 25.6 %Lincoln County25.6Lawrence County: 25.5 %Lawrence County25.5Grundy County: 25.2 %Grundy County25.2Pettis County: 25.2 %Pettis County25.2Dunklin County: 25.1 %Dunklin County25.1Cedar County: 24.9 %Cedar County24.9Jasper County: 24.8 %Jasper County24.8Clay County: 24.4 %Clay County24.4Barton County: 24.3 %Barton County24.3Vernon County: 24.3 %Vernon County24.3Shelby County: 24.3 %Shelby County24.3Laclede County: 24.3 %Laclede County24.3Cass County: 24.2 %Cass County24.2Scott County: 24.2 %Scott County24.2Howell County: 24.1 %Howell County24.1Polk County: 24 %Polk County24Andrew County: 24 %Andrew County24Dallas County: 24 %Dallas County24Knox County: 24 %Knox County24Ripley County: 23.9 %Ripley County23.9Newton County: 23.9 %Newton County23.9Platte County: 23.9 %Platte County23.9Miller County: 23.8 %Miller County23.8New Madrid County: 23.8 %New Madrid County23.8Sullivan County: 23.7 %Sullivan County23.7Audrain County: 23.6 %Audrain County23.6Clark County: 23.6 %Clark County23.6Harrison County: 23.5 %Harrison County23.5Warren County: 23.4 %Warren County23.4Caldwell County: 23.4 %Caldwell County23.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Scotland County29.9-0.1 pts
2Webster County27.5+0.7 pts
3Schuyler County26.7+1 pts
4McDonald County26.3+0.1 pts
5Wright County26+0.5 pts
6Pemiscot County26+0.4 pts
7Moniteau County25.9+0.8 pts
8Christian County25.9-0.2 pts
9Gentry County25.8+0.8 pts
10Daviess County25.6-0.2 pts
11Lincoln County25.6-0.1 pts
12Lawrence County25.5+0.2 pts
13Grundy County25.2+0.3 pts
14Pettis County25.2+0.2 pts
15Dunklin County25.1+0.4 pts
16Cedar County24.9-0 pts
17Jasper County24.8-0.2 pts
18Clay County24.4-0.2 pts
19Barton County24.3+0.1 pts
20Vernon County24.3+0.1 pts
21Shelby County24.3-0.2 pts
22Laclede County24.3+0.4 pts
23Cass County24.2-0.2 pts
24Scott County24.2+0.2 pts
25Howell County24.1+0.5 pts
26Polk County24+0.2 pts
27Andrew County24-0.3 pts
28Dallas County24+0.2 pts
29Knox County24+0.2 pts
30Ripley County23.9+1.7 pts
31Newton County23.9+0.4 pts
32Platte County23.9-0 pts
33Miller County23.8+0.3 pts
34New Madrid County23.80 pts
35Sullivan County23.7+0.2 pts
36Audrain County23.6+0.2 pts
37Clark County23.6-0.2 pts
38Harrison County23.5-0.1 pts
39Warren County23.4+0.1 pts
40Caldwell County23.4+0.2 pts
41Butler County23.3-0.1 pts
42Mercer County23.3+0.3 pts
43Clinton County23.3-0.3 pts
44St. Charles County23.3-0.2 pts
45Pike County23.2+0.4 pts
46Macon County23.1-0 pts
47Lafayette County23.1+0.1 pts
48Barry County23.10 pts
49Marion County23.1+0.1 pts
50Jefferson County23.1-0.2 pts
51Linn County23-0 pts
52Ray County23-0.1 pts
53Bates County23+0.2 pts
54Perry County23-0.1 pts
55Jackson County22.9-0 pts
56Crawford County22.9+0.4 pts
57Oregon County22.8+1.1 pts
58Morgan County22.8-0.2 pts
59Cooper County22.8+1 pts
60Osage County22.8-0.3 pts
61Madison County22.7-0.3 pts
62Carter County22.6+1 pts
63Washington County22.6+0.2 pts
64Pulaski County22.6+0.1 pts
65Stoddard County22.6+0.2 pts
66Dent County22.5+0.7 pts
67Franklin County22.5-0.1 pts
68Bollinger County22.5+0.9 pts
69Cole County22.4+0.5 pts
70Buchanan County22.4+0.4 pts
71Douglas County22.4+0.8 pts
72Johnson County22.4-0.1 pts
73Chariton County22.4-0 pts
74Shannon County22.3+0.8 pts
75Howard County22.3+0.2 pts
76Monroe County22.20 pts
77Henry County22.1+0.2 pts
78St. Louis County22.1+0.1 pts
79Saline County22.1-0.1 pts
80Putnam County22+0.1 pts
81Texas County22+0.2 pts
82Montgomery County21.9-0.2 pts
83Callaway County21.7+0.2 pts
84Dade County21.6+0.6 pts
85St. Clair County21.6+1.1 pts
86Ralls County21.6-0.8 pts
87Randolph County21.5+0.1 pts
88Maries County21.5-0.1 pts
89Mississippi County21.5+1.1 pts
90Carroll County21.5-0.7 pts
91Ste. Genevieve County21.40 pts
92Holt County21.4-0.3 pts
93Iron County21.4+0.1 pts
94Livingston County21.3+0.7 pts
95Cape Girardeau County21.3-0 pts
95Reynolds County21.3-0.3 pts
97Lewis County21.2+0.1 pts
98St. Francois County21.1+0.2 pts
99Atchison County20.9-0.5 pts
100Gasconade County20.9-0.2 pts
101Boone County20.9-0 pts
102Phelps County20.8+0.2 pts
103Greene County20.6-0.1 pts
104Taney County20.6+0.4 pts
105Wayne County20.2+0.7 pts
106Worth County19.6-1.6 pts
107Nodaway County19.5-0 pts
108Adair County19-0.2 pts
109Ozark County18.7-0.7 pts
110Camden County18.4-0.1 pts
111St. Louis city18.4+0.2 pts
112DeKalb County18.1-1.4 pts
113Benton County18+0.1 pts
114Stone County17.2+0.1 pts
115Hickory County17+0.7 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, 2020) [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, 2020. 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=2020. 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, 2020. 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=2020.

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, 2020 [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=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_missouri_by_2020,
  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, 2020}},
  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=2020. 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, 2020
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=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/missouri-counties?period=2020.
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 29.9% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Hickory County, with 17% in 2020.

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