Data / Rankings / Population aged 65 and over / Counties in Iowa

Counties in Iowa by share of population aged 65 and over, 2025

Jefferson County had the highest share of population aged 65 and over of 99 counties in 2025, at 30.7%. Dallas County had the lowest, at 14.5%. The median was 23.5% and the figure for Iowa was 20.1%. Source: the U.S. Census Bureau.

Full ranking

Other periods

• 2025
• 2024
• 2023
• 2022
• 2021
• 2020

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

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 (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

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Rank Counties in Iowa by share of population aged 65 and over using official data, and cite the source.

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Population aged 65 and over: other rankings

• Countries
• EU countries
• US states
• EU regions (NUTS 2)
• US counties
• Autonomous communities of Spain
• Provinces of Spain
• Municipalities of Spain
• Regions of Germany (NUTS 2)
• Regions of France (NUTS 2)
• Regions of Italy (NUTS 2)
• Regions of Poland (NUTS 2)

Counties in Iowa: 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 age
• Median gross rent (monthly)
• Median home value