Data / Rankings / Population aged 18 to 64 / Counties in Missouri

Counties in Missouri by population aged 18 to 64

St. Louis city had the highest population aged 18 to 64 of 115 counties in 2020, at 68.2%. Hickory County had the lowest, at 48.4%. The median was 56.5% and the figure for Missouri was 59.9%. Source: the U.S. Census Bureau.

Highest68.2St. Louis city
Lowest48.4Hickory County
Median56.5115 counties
Missouri59.9History

Top 40 counties, 2020

St. Louis city: 68.2 %St. Louis city68.2Pulaski County: 68.2 %Pulaski County68.2Boone County: 65.8 %Boone County65.8Adair County: 65.1 %Adair County65.1DeKalb County: 63.8 %DeKalb County63.8Johnson County: 63.8 %Johnson County63.8Nodaway County: 62.9 %Nodaway County62.9Phelps County: 62.2 %Phelps County62.2Greene County: 62.2 %Greene County62.2Jackson County: 61.7 %Jackson County61.7Callaway County: 61.4 %Callaway County61.4St. Francois County: 61.4 %St. Francois County61.4Platte County: 61 %Platte County61Clay County: 60.8 %Clay County60.8Cape Girardeau County: 60.8 %Cape Girardeau County60.8Jefferson County: 60.6 %Jefferson County60.6St. Charles County: 60.6 %St. Charles County60.6Randolph County: 60.5 %Randolph County60.5Saline County: 60.4 %Saline County60.4Lincoln County: 60.1 %Lincoln County60.1Buchanan County: 60 %Buchanan County60Cole County: 59.9 %Cole County59.9Washington County: 59.6 %Washington County59.6Lewis County: 59.5 %Lewis County59.5Jasper County: 59.2 %Jasper County59.2McDonald County: 59 %McDonald County59Warren County: 58.9 %Warren County58.9St. Louis County: 58.9 %St. Louis County58.9Howard County: 58.8 %Howard County58.8Franklin County: 58.7 %Franklin County58.7Osage County: 58.6 %Osage County58.6Mississippi County: 58.4 %Mississippi County58.4Ste. Genevieve County: 58.3 %Ste. Genevieve County58.3Cass County: 58.3 %Cass County58.3Ray County: 58 %Ray County58Cooper County: 57.8 %Cooper County57.8Marion County: 57.7 %Marion County57.7Pike County: 57.7 %Pike County57.7Butler County: 57.7 %Butler County57.7Pettis County: 57.6 %Pettis County57.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1St. Louis city68.2-0.5 pts
2Pulaski County68.2-0.3 pts
3Boone County65.8-0.4 pts
4Adair County65.1-0.1 pts
5DeKalb County63.8+1.9 pts
6Johnson County63.8-0.1 pts
7Nodaway County62.9-1.1 pts
8Phelps County62.2-0.5 pts
9Greene County62.2-0.3 pts
10Jackson County61.7-0.3 pts
11Callaway County61.4-0.6 pts
12St. Francois County61.4-0.9 pts
13Platte County61-0.4 pts
14Clay County60.8-0.2 pts
15Cape Girardeau County60.8-0.3 pts
16Jefferson County60.6-0.4 pts
17St. Charles County60.6-0.3 pts
18Randolph County60.5-0.8 pts
19Saline County60.4+0.2 pts
20Lincoln County60.1-0.5 pts
21Buchanan County60-0.9 pts
22Cole County59.9-1.1 pts
23Washington County59.6-0.8 pts
24Lewis County59.5-0.5 pts
25Jasper County59.2-0.2 pts
26McDonald County59-0.3 pts
27Warren County58.9-0.4 pts
28St. Louis County58.9-0.5 pts
29Howard County58.8-0.6 pts
30Franklin County58.7-0.5 pts
31Osage County58.6-0.2 pts
32Mississippi County58.4-2.2 pts
33Ste. Genevieve County58.3-0.7 pts
34Cass County58.3-0.2 pts
35Ray County58-0.2 pts
36Cooper County57.8-2.1 pts
37Marion County57.7-0.6 pts
38Pike County57.7-1 pts
39Butler County57.7-0.3 pts
40Pettis County57.6-0.6 pts
41Christian County57.5-0.4 pts
42Livingston County57.4-1.7 pts
43Lafayette County57.4-0.5 pts
44Taney County57.4-0.8 pts
45Madison County57.4-0.2 pts
46Maries County57.2+0.4 pts
47Scott County57.1-0.4 pts
48Newton County57.1-0.7 pts
49Perry County57.1-0.4 pts
50Laclede County57-0.8 pts
51Clinton County57-0.2 pts
52Stoddard County56.9-0.4 pts
53Polk County56.9-0.4 pts
54Andrew County56.8-0.2 pts
55Miller County56.7-0.5 pts
56Moniteau County56.6-1.4 pts
57Ralls County56.6+0.3 pts
58Audrain County56.5-0.6 pts
59Crawford County56.5-0.8 pts
60Texas County56.5-0.7 pts
61Sullivan County56.4+0.4 pts
62Webster County56.4-1 pts
63Pemiscot County56.4-0.7 pts
64Bates County56.3-0.6 pts
65Montgomery County56.1-0.6 pts
66New Madrid County56.1-0.6 pts
67Iron County56-0.4 pts
68Dunklin County55.9-0.6 pts
69Vernon County55.9-0.6 pts
70Barton County55.8-0.1 pts
71Barry County55.7-0.4 pts
72Bollinger County55.7-0.9 pts
73Lawrence County55.6-0.5 pts
74Dent County55.5-1.1 pts
75Caldwell County55.4-0.5 pts
76Gasconade County55.3-0.7 pts
77Carroll County55.2+0.3 pts
78Dallas County55.2-0.5 pts
79Worth County55.2-0.4 pts
80Carter County55-0.8 pts
81Howell County55-0.7 pts
82Henry County54.9-0.6 pts
83Reynolds County54.6+0.3 pts
84Linn County54.6-0.2 pts
85Mercer County54.4-0.8 pts
86Macon County54.2-0.1 pts
87Wright County54.1-0.9 pts
88Shannon County54-1.1 pts
89Clark County54-0.3 pts
90Daviess County54+0.4 pts
91Camden County53.9-0.5 pts
92Wayne County53.8-1.1 pts
93Atchison County53.80 pts
94Ripley County53.7-1.5 pts
95Monroe County53.6-0.6 pts
96Dade County53.4-1.1 pts
97Chariton County53.2-0.7 pts
98Ozark County53.1+0.1 pts
99Harrison County53.1-0.6 pts
100Shelby County53-0.4 pts
101Gentry County52.9-0.7 pts
102Morgan County52.9-0.4 pts
103Knox County52.7-0.4 pts
104St. Clair County52.7-0.6 pts
105Holt County52.6-0.6 pts
106Oregon County52.6-0.8 pts
107Grundy County52.4-0.5 pts
108Putnam County52.2-0.2 pts
109Stone County52-0.4 pts
110Schuyler County51.9-1.6 pts
111Douglas County51.5-0.9 pts
112Cedar County51.5-0.1 pts
113Benton County51.3-0.6 pts
114Scotland County51.2-0.3 pts
115Hickory County48.4-0.5 pts

Other periods

About this ranking

Residents aged 18 to 64 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.

Not comparable with working-age shares for ages 15 to 64 used in EU and World Bank statistics.

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 18 to 64 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 18 to 64 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 aged 18 to 64, 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 18 to 64 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 aged 18 to 64, 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-18-64/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 18 to 64 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 aged 18 to 64, 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-18-64/missouri-counties?period=2020.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64, 2020 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/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 18 to 64 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 aged 18 to 64, 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-18-64/missouri-counties?period=2020. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 18 to 64 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 aged 18 to 64, 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-18-64/missouri-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/missouri-counties?period=2020.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64?

St. Louis city, with 68.2% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Hickory County, with 48.4% 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 18 to 64 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 aged 18 to 64: other rankings

Counties in Missouri: more rankings