US counties by median age
Sumter County had the highest median age of 3135 counties in 2021, at 68.1 years. Lexington city had the lowest, at 22.4 years. The median was 41.3 years and the figure for the United States was 38.4 years. Source: the U.S. Census Bureau.
Top 40 counties, 2021
Full ranking
Other periods
About this ranking
Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.
Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 9 counties with data in other periods have no value for 2021 and are left out rather than filled from another source. Equal values share a rank.
How to cite
U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b01002.dat. Retrieved 2026-10-08.Use this data in your AI agent
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Rank US counties by median age using official data, and cite the source.
rank_places {"indicator":"median_age","level":"province","within":"United States","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=median_age&level=province&within=United%20States&limit=10Questions
Which county has the highest median age?
Sumter County, with 68.1 years in 2021, according to the U.S. Census Bureau.
Which county has the lowest median age?
Lexington city, with 22.4 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, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08. 9 counties have no value for 2021 and are not ranked.
Median age: other rankings
- EU countries
- US states
- EU regions (NUTS 2)
- Autonomous communities of Spain
- Provinces of Spain
- Regions of Germany (NUTS 2)
- Regions of France (NUTS 2)
- Regions of Italy (NUTS 2)
- Regions of Poland (NUTS 2)
- Regions of Greece (NUTS 2)
- Regions of Netherlands (NUTS 2)
- Regions of Belgium (NUTS 2)
US counties: more rankings
- Asian population share
- Bachelor's degree or higher, population 25 and over
- Live births, July to June
- Black or African American population share
- Crude birth rate, July to June
- Crude death rate, July to June
- Deaths, July to June
- Foreign-born population share
- Real GDP growth
- GDP per capita, US dollars
- Gross domestic product (GDP), US dollars
- Hispanic or Latino population share
- Homeownership rate (US, housing units)
- Median gross rent (monthly)
- Median home value
- Median household income