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Rock Island Today

Saturday, October 4, 2025

Census Bureau reports Rock Island Arsenal population was 353 in 2020

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Rock Island Arsenal had a population of 353 people in 2020, according to U.S. Census Bureau data obtained by the Rock Island Today.

The median age was 28, with 42.5 percent of the total population being female and 57.5 percent male.

The state's total population in 2020 was 12,716,164.

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.

Rock Island Arsenal population by sex

Estimated NumberPercent of total population
Male20357.5
Female15042.5
Total Population353100

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