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

Smith County had the highest median age on 1 July (US county estimates) of 105 counties in 2020, at 51.9 years. Riley County had the lowest, at 25.4 years. The median was 41.9 years. Source: the U.S. Census Bureau.

Highest51.9Smith County

Lowest25.4Riley County

Median41.9105 counties

Top 40 counties, 2020

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	2020 years	Change on 2019
1	Smith County	51.9	+0.3
2	Decatur County	51.1	+0.7
3	Jewell County	50.6	+0.4
4	Elk County	50.5	0
4	Graham County	50.5	-0.6
6	Ness County	50	-0.6
7	Osborne County	49.8	+0.1
8	Republic County	49.2	+0.1
9	Rush County	49.1	+1
10	Trego County	48.8	+0.1
11	Greenwood County	48.7	+0.6
12	Lane County	47.4	-0.9
13	Lincoln County	47.2	-0.3
14	Morris County	47.1	+0.5
15	Woodson County	46.9	+1.1
16	Barber County	46.5	-0.6
16	Rawlins County	46.5	-0.7
18	Comanche County	46.4	+1.2
19	Cheyenne County	46.1	-0.5
19	Kingman County	46.1	+1
19	Linn County	46.1	+0.6
19	Phillips County	46.1	-0.3
23	Hodgeman County	46	-0.7
23	Mitchell County	46	-0.4
25	Chautauqua County	45.9	-1.5
25	Edwards County	45.9	-0.2
27	Chase County	45.4	+0.4
28	Rooks County	45.2	+0.1
29	Coffey County	45.1	+0.2
30	Marion County	45	+0.4
31	Russell County	44.8	+0.1
32	Clay County	44.5	+0.1
33	Osage County	44.3	+0.1
34	Ottawa County	44.2	-0.3
35	Wilson County	43.9	+0.3
36	Dickinson County	43.8	+0.5
36	Ellsworth County	43.8	+0.8
36	Jefferson County	43.8	+0.2
36	Washington County	43.8	-1.2
40	Marshall County	43.6	+0.2
40	Stafford County	43.6	-1.1
40	Wabaunsee County	43.6	-0.1
43	Morton County	43.5	+0.6
44	Harper County	43.4	+0.3
45	Pawnee County	42.8	+0.8
46	Clark County	42.5	+0.5
46	Gove County	42.5	-0.5
46	Sheridan County	42.5	-0.3
46	Wallace County	42.5	+0.3
50	Cherokee County	42.3	-0.4
51	Norton County	42	-0.4
52	Brown County	41.9	-0.4
52	Sumner County	41.9	+0.4
54	Allen County	41.4	-0.3
54	Anderson County	41.4	-0.7
54	Jackson County	41.4	-0.1
57	Miami County	41.2	+0.2
58	Montgomery County	41.1	+0.2
58	Reno County	41.1	+0.2
60	Cloud County	41	+0.3
60	Kiowa County	41	+0.9
62	Doniphan County	40.8	+1
62	Harvey County	40.8	+0.4
64	Barton County	40.6	+0.3
64	Greeley County	40.6	+0.7
66	Nemaha County	40.5	+0.2
67	Labette County	40.2	-0.3
67	Neosho County	40.2	0
69	Franklin County	40	-0.1
69	Logan County	40	+0.7
69	McPherson County	40	+0.1
72	Rice County	39.9	+0.7
73	Saline County	39.7	+0.2
73	Shawnee County	39.7	+0.2
75	Pratt County	39.5	-0.1
76	Scott County	39.2	+0.2
77	Cowley County	39	+0.1
77	Wichita County	39	-0.3
79	Sherman County	38.9	+0.7
80	Bourbon County	38.7	-0.2
80	Meade County	38.7	+0.1
82	Leavenworth County	38.5	+0.1
83	Butler County	38.4	+0.3
84	Johnson County	38.2	+0.2
85	Gray County	37.4	+0.3
86	Atchison County	37.1	+0.3
87	Stevens County	36.8	+0.3
88	Thomas County	36.7	0
89	Pottawatomie County	36.2	+0.2
90	Sedgwick County	36	+0.1
91	Stanton County	35.7	-0.4
92	Kearny County	35.3	+0.3
93	Lyon County	35.2	-0.2
94	Hamilton County	35.1	+1.3
95	Crawford County	34.5	-0.2
96	Wyandotte County	34.4	+0.2
97	Haskell County	34.3	+0.3
98	Grant County	34	+0.2
99	Ellis County	33.9	0
100	Douglas County	32	+0.2
101	Finney County	31.8	+0.2
102	Ford County	31.5	+0.1
103	Seward County	31	+0.5
104	Geary County	28.5	-0.2
105	Riley County	25.4	+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 Kansas by median age on 1 July (US county estimates), 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: 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 Kansas by median age on 1 July (US county estimates), 2020. 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/kansas-counties?period=2020. 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 Kansas by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/kansas-counties?period=2020.

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 Kansas by median age on 1 July (US county estimates), 2020 [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/kansas-counties?period=2020 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_kansas_by_2020,
  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 Kansas by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/kansas-counties?period=2020. 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 Kansas by median age on 1 July (US county estimates), 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/median-age-july-1-us-counties/kansas-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/kansas-counties?period=2020.
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)?

Smith County, with 51.9 years in 2020, according to the U.S. Census Bureau.

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

Riley County, with 25.4 years 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: 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.