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 2018, at 56 years. Pulaski County had the lowest, at 27.3 years. The median was 41.4 years. Source: the U.S. Census Bureau.

Highest56Hickory County

Lowest27.3Pulaski County

Median41.4115 counties

Top 40 counties, 2018

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	2018 years	Change on 2017
1	Hickory County	56	+0.5
2	Stone County	53.7	+0.3
3	Benton County	53.5	0
4	Ozark County	51.5	+0.5
5	Camden County	51.1	+0.2
6	St. Clair County	48.6	-0.2
7	Wayne County	48.3	+0.4
8	Dade County	47.8	+0.7
9	Holt County	47.7	0
10	Oregon County	47.6	-0.2
11	Shannon County	47.2	+0.5
12	Douglas County	47.1	-0.3
12	Putnam County	47.1	+0.7
14	Worth County	46.8	+0.1
15	Atchison County	46.7	+0.2
16	Gasconade County	46.4	0
16	Reynolds County	46.4	+0.2
18	Chariton County	46.3	+0.1
19	Morgan County	46	-0.6
20	Monroe County	45.9	+0.4
21	Carter County	45.3	+1.2
21	Iron County	45.3	0
21	Maries County	45.3	+0.4
24	Bollinger County	45.1	+0.4
24	Montgomery County	45.1	+0.1
26	Knox County	45	0
27	Dent County	44.9	-0.1
27	Ralls County	44.9	+0.3
29	Henry County	44.8	+0.1
30	Ripley County	44.4	+0.6
31	Carroll County	44.2	+0.1
32	Cedar County	43.8	-0.2
32	Ste. Genevieve County	43.8	-0.2
34	Mercer County	43.7	+0.1
35	Macon County	43.5	+0.1
36	Crawford County	43.4	+0.3
37	Dallas County	43.3	+0.1
38	Harrison County	43.2	+0.2
39	Barry County	43.1	+0.2
39	Caldwell County	43.1	-0.3
41	Texas County	43	+0.1
42	Clark County	42.8	-0.4
43	Linn County	42.7	+0.2
43	Sullivan County	42.7	0
45	Ray County	42.3	0
46	New Madrid County	42.2	+0.2
47	Clinton County	42.1	+0.2
47	Lafayette County	42.1	-0.1
49	Stoddard County	42	-0.1
50	Mississippi County	41.9	+0.5
50	Shelby County	41.9	-0.3
52	Bates County	41.8	-0.2
53	Taney County	41.7	+0.2
53	Washington County	41.7	+0.2
55	Madison County	41.5	+0.1
55	Miller County	41.5	-0.1
57	DeKalb County	41.4	+0.2
57	Perry County	41.4	+0.4
59	Franklin County	41.3	+0.2
59	Howell County	41.3	+0.1
61	Andrew County	41.2	-0.1
61	Barton County	41.2	-0.1
61	Livingston County	41.2	+0.1
64	Warren County	41.1	+0.4
65	Daviess County	40.9	0
65	Wright County	40.9	-0.1
67	Osage County	40.8	-0.1
68	Dunklin County	40.6	+0.3
68	Laclede County	40.6	0
68	Schuyler County	40.6	+0.1
71	Newton County	40.4	+0.2
71	St. Louis County	40.4	0
73	Butler County	40.2	0
73	Gentry County	40.2	-0.4
73	Randolph County	40.2	+0.3
76	Grundy County	40.1	-0.3
77	Lawrence County	40	-0.2
78	Cass County	39.9	+0.1
78	Pike County	39.9	+0.1
78	Scott County	39.9	0
81	Cooper County	39.8	+0.2
81	Jefferson County	39.8	+0.3
81	St. Francois County	39.8	+0.3
81	Vernon County	39.8	-0.1
85	Marion County	39.7	-0.1
86	Cole County	39.4	+0.2
87	Audrain County	39.3	+0.1
88	Callaway County	39	+0.2
88	Pemiscot County	39	+0.6
88	Polk County	39	-0.3
91	Lewis County	38.9	-0.1
92	St. Charles County	38.7	+0.4
93	Buchanan County	38.4	+0.4
94	Howard County	38	-0.3
95	Moniteau County	37.9	0
95	Platte County	37.9	+0.1
97	Christian County	37.8	+0.2
97	Pettis County	37.8	+0.2
99	McDonald County	37.5	-0.3
100	Webster County	37.4	0
101	Lincoln County	37.3	-0.1
102	Cape Girardeau County	37.1	+0.2
102	Clay County	37.1	+0.1
104	Saline County	36.9	-0.1
105	Jackson County	36.6	+0.1
106	Greene County	36.5	+0.2
107	Jasper County	35.8	+0.1
108	Phelps County	35.6	+0.3
108	Scotland County	35.6	+0.1
110	St. Louis city	35.3	+0.3
111	Nodaway County	32.9	+0.7
112	Johnson County	31.7	+0.5
113	Boone County	31.3	+0.3
114	Adair County	30.4	+0.4
115	Pulaski County	27.3	+0.2

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), 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: 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), 2018. 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=2018. 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), 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/median-age-july-1-us-counties/missouri-counties?period=2018.

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), 2018 [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=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: 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), 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/median-age-july-1-us-counties/missouri-counties?period=2018. 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), 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/median-age-july-1-us-counties/missouri-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/missouri-counties?period=2018.
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 56 years in 2018, according to the U.S. Census Bureau.

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

Pulaski County, with 27.3 years 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: 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.