Counties in Ohio by median age on 1 July (US county estimates), 2025

Ottawa County had the highest median age on 1 July (US county estimates) of 88 counties in 2025, at 51.5 years. Athens County had the lowest, at 30.5 years. The median was 41.5 years. Source: the U.S. Census Bureau.

Highest51.5Ottawa County

Lowest30.5Athens County

Median41.588 counties

Map of counties, 2025

Under 40
40 to 41
41 to 42
42 to 43
43 to 44
44 and over

years, 2025. 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. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2025

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	2025 years	Change on 2024
1	Ottawa County	51.5	+0.2
2	Monroe County	46.9	+0.1
3	Carroll County	46.4	+0.1
4	Erie County	46.2	+0.1
5	Geauga County	45.8	0
6	Harrison County	45.7	-0.1
7	Columbiana County	45.4	+0.1
8	Belmont County	45.3	+0.3
9	Meigs County	45.2	+0.1
10	Lake County	45	+0.1
10	Morgan County	45	-0.1
12	Washington County	44.6	+0.2
13	Hocking County	44.5	+0.1
14	Medina County	44.3	+0.2
15	Trumbull County	44.1	+0.1
16	Wyandot County	44	+0.1
17	Preble County	43.7	+0.2
18	Crawford County	43.6	-0.3
19	Ashtabula County	43.5	+0.1
19	Jefferson County	43.5	-0.1
19	Mahoning County	43.5	0
22	Logan County	43.4	-0.1
22	Sandusky County	43.4	+0.1
24	Vinton County	43.3	-0.3
25	Lawrence County	43.2	+0.1
25	Morrow County	43.2	+0.1
27	Lorain County	43	+0.1
28	Fulton County	42.8	+0.2
29	Brown County	42.7	-0.2
30	Darke County	42.6	+0.1
31	Williams County	42.5	0
32	Champaign County	42.4	0
33	Guernsey County	42.3	-0.1
34	Henry County	42.2	-0.2
34	Stark County	42.2	+0.1
36	Auglaize County	42	+0.1
37	Ashland County	41.9	+0.2
38	Miami County	41.8	+0.2
38	Summit County	41.8	+0.1
40	Fayette County	41.7	0
40	Ross County	41.7	+0.1
42	Paulding County	41.6	+0.2
42	Perry County	41.6	0
44	Adams County	41.5	-0.2
44	Clark County	41.5	+0.1
44	Defiance County	41.5	+0.1
44	Huron County	41.5	+0.1
48	Coshocton County	41.4	+0.1
48	Gallia County	41.4	-0.1
48	Richland County	41.4	0
48	Tuscarawas County	41.4	-0.1
52	Clinton County	41.3	0
53	Clermont County	41.2	+0.1
53	Highland County	41.2	0
53	Van Wert County	41.2	0
56	Pike County	41.1	+0.1
57	Scioto County	41	0
58	Cuyahoga County	40.9	+0.1
58	Marion County	40.9	-0.1
60	Madison County	40.8	-0.1
60	Muskingum County	40.8	-0.2
60	Warren County	40.8	+0.2
63	Jackson County	40.7	-0.1
63	Licking County	40.7	+0.1
63	Putnam County	40.7	0
66	Hancock County	40.6	+0.1
66	Seneca County	40.6	+0.1
68	Delaware County	40.5	+0.2
68	Noble County	40.5	0
70	Portage County	40.4	+0.2
71	Knox County	40.3	+0.1
72	Allen County	40.1	+0.1
73	Shelby County	40	0
74	Fairfield County	39.8	+0.1
75	Pickaway County	39.7	0
76	Lucas County	39.6	+0.3
77	Wayne County	39.4	+0.1
78	Mercer County	39.3	-0.1
78	Montgomery County	39.3	0
80	Union County	38.7	+0.2
81	Greene County	38.6	-0.1
82	Butler County	38	+0.2
83	Hamilton County	37.2	+0.2
84	Wood County	36.9	0
85	Hardin County	36.5	0
86	Franklin County	35.1	+0.3
87	Holmes County	31.9	+0.1
88	Athens County	30.5	0

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 Ohio by median age on 1 July (US county estimates), 2025) [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 Ohio by median age on 1 July (US county estimates), 2025. 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/ohio-counties. 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 Ohio by median age on 1 July (US county estimates), 2025. 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/ohio-counties.

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 Ohio by median age on 1 July (US county estimates), 2025 [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/ohio-counties (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_ohio_by_2025,
  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 Ohio by median age on 1 July (US county estimates), 2025}},
  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/ohio-counties. 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 Ohio by median age on 1 July (US county estimates), 2025
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/ohio-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/ohio-counties.
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)?

Ottawa County, with 51.5 years in 2025, according to the U.S. Census Bureau.

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

Athens County, with 30.5 years in 2025.

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.