Counties in Missouri by median age on 1 July (US county estimates)

Hickory County had the highest median age on 1 July (US county estimates) of 115 counties in 2021, at 55.6 years. Pulaski County had the lowest, at 27.5 years. The median was 41.8 years. Source: the U.S. Census Bureau.

Highest55.6Hickory County

Lowest27.5Pulaski County

Median41.8115 counties

Top 40 counties, 2021

years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2021 years	Change on 2020
1	Hickory County	55.6	-1.2
2	Stone County	54.1	+0.2
3	Benton County	53.4	-0.3
4	Camden County	51.9	+0.2
5	Ozark County	51.1	-0.9
6	Worth County	49.3	0
7	Wayne County	48.8	-0.2
8	St. Clair County	48.3	+0.1
9	Dade County	47.4	+0.2
10	Holt County	47.2	-1.2
11	Atchison County	46.9	0
12	Gasconade County	46.7	-0.1
12	Reynolds County	46.7	-0.1
14	Chariton County	46.6	+0.1
15	Shannon County	46.4	-0.7
16	Douglas County	46.2	-0.8
16	Oregon County	46.2	-0.5
16	Ralls County	46.2	+0.4
19	Morgan County	45.9	-0.5
20	Iron County	45.5	-0.2
20	Putnam County	45.5	-0.6
22	Monroe County	45.4	-0.3
23	Maries County	45.3	-0.1
24	Carroll County	44.8	-0.1
24	Dent County	44.8	+0.1
26	Bollinger County	44.7	-0.2
27	Montgomery County	44.5	-0.4
28	Carter County	44.3	-0.9
29	Henry County	44.2	-0.4
30	Ste. Genevieve County	43.8	0
31	Crawford County	43.6	+0.4
32	Caldwell County	43.5	-0.1
32	Knox County	43.5	-0.5
34	Mercer County	43.4	+0.3
35	Clark County	43.2	-0.4
36	Harrison County	42.9	-0.4
36	Linn County	42.9	-0.3
36	Macon County	42.9	-0.5
36	Ripley County	42.9	-0.7
40	Barry County	42.8	-0.4
40	Cedar County	42.8	-0.7
40	Shelby County	42.8	+0.2
43	Texas County	42.7	-0.7
44	Mississippi County	42.5	-0.3
44	Taney County	42.5	+0.3
46	Dallas County	42.4	-0.2
46	New Madrid County	42.4	-0.3
48	Bates County	42.3	0
48	Ray County	42.3	0
48	Stoddard County	42.3	+0.1
51	Clinton County	42.2	-0.1
52	DeKalb County	42.1	-0.1
52	Madison County	42.1	-0.1
52	Perry County	42.1	+0.1
55	Andrew County	42	+0.4
55	Sullivan County	42	+0.3
57	Franklin County	41.8	+0.1
57	Lafayette County	41.8	+0.3
57	Washington County	41.8	-0.3
60	Barton County	41.3	0
60	Cooper County	41.3	+0.1
60	Daviess County	41.3	+0.5
63	Howell County	41.2	0
63	Miller County	41.2	0
65	Osage County	41.1	-0.2
66	Livingston County	40.9	-0.4
67	Pike County	40.7	-0.2
67	Warren County	40.7	+0.1
69	Laclede County	40.6	0
69	Randolph County	40.6	0
69	St. Louis County	40.6	+0.1
72	Dunklin County	40.5	-0.2
72	Jefferson County	40.5	+0.2
74	St. Francois County	40.4	0
75	Butler County	40.2	-0.3
75	Cass County	40.2	0
75	Marion County	40.2	+0.1
75	Newton County	40.2	-0.1
75	Wright County	40.2	-0.3
80	Cole County	40	+0.2
80	Scott County	40	0
82	Gentry County	39.9	-0.5
82	Schuyler County	39.9	-0.8
82	Vernon County	39.9	-0.3
85	Audrain County	39.7	-0.3
85	Grundy County	39.7	-0.4
87	Callaway County	39.6	+0.2
87	Lewis County	39.6	+0.1
87	St. Charles County	39.6	+0.2
90	Lawrence County	39.5	-0.3
91	Howard County	39.2	+0.4
92	Buchanan County	39.1	+0.1
93	Pemiscot County	39	0
94	Moniteau County	38.9	+0.2
94	Polk County	38.9	-0.1
96	Platte County	38.7	+0.3
97	Christian County	38.4	+0.1
98	Pettis County	37.9	0
99	McDonald County	37.8	+0.1
100	Clay County	37.5	+0.1
101	Cape Girardeau County	37.3	0
102	Lincoln County	37.2	-0.1
102	Webster County	37.2	-0.2
104	Jackson County	37	+0.2
105	Greene County	36.9	0
105	Saline County	36.9	-0.1
107	Jasper County	36.3	+0.1
107	Scotland County	36.3	-0.1
109	St. Louis city	35.9	+0.5
110	Phelps County	35.5	+0.1
111	Nodaway County	32.5	-0.1
112	Boone County	32.1	+0.2
113	Johnson County	31.8	-0.1
114	Adair County	29.5	0
115	Pulaski County	27.5	+0.1

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in Missouri by median age on 1 July (US county estimates), 2021) [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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Missouri by median age on 1 July (US county estimates), 2021. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/missouri-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in Missouri by median age on 1 July (US county estimates), 2021. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/missouri-counties?period=2021.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Missouri by median age on 1 July (US county estimates), 2021 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/missouri-counties?period=2021 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_missouri_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Missouri by median age on 1 July (US county estimates), 2021}},
  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/median-age-july-1-us-counties/missouri-counties?period=2021. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Missouri by median age on 1 July (US county estimates), 2021
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/median-age-july-1-us-counties/missouri-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/missouri-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. 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 median age on 1 July (US county estimates)?

Hickory County, with 55.6 years in 2021, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Pulaski County, with 27.5 years in 2021.

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: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.