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South Iowa News

Tuesday, November 11, 2025

Census Bureau reports Decatur County population was 7,908 in 2020

Webp names 12

Decatur County had a population of 7,908 people in 2020, according to U.S. Census Bureau data obtained by the South Iowa News.

The median age was 36, with 49.7 percent of the total population being female and 50.3 percent male.

The state's total population in 2020 was 3,150,011.

An agency of the U.S. Federal Statistical System, the Census Bureau is responsible for compiling statistical facts about the American people, places and economy. Data for this story was compiled from the bureau’s American Community Survey. Information from the survey helps to determine how federal and state funds are distributed.

Decatur County population by sex

Estimated NumberPercent of total population
Male3,97550.3
Female3,93349.7
Total Population7,908100

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