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Quincy-Hannibal, IL-MO Combined Statistical Area Demographics

Quincy-Hannibal, IL-MO Combined Statistical Area is the 174th most populous of 184 combined statistical areas in the United States, with 114,649 residents across 2,267 square miles. That is about 51 people per square mile.

At the 2020 census

Population 114,649
Land area 2,267 sq mi
Density 51 / sq mi

Data: 2020 Census · American Community Survey 2024

How Quincy-Hannibal, IL-MO Combined Statistical Area compares to the US

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Central Location: Quincy-Hannibal, IL-MO Combined Statistical Area

Measured from the combined statistical area's main population center using 2020 census blocks.

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Counties in the Quincy-Hannibal, IL-MO Combined Statistical Area area

Name Population Sq mi Per sq mi
Adams County, IL 65,737 855.1 77
Marion County 28,525 436.9 65
Ralls County 10,355 469.8 22
Lewis County, MO 10,032 505.0 20

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About this page

This page shows demographics for a US combined statistical area from the 2020 census and the American Community Survey: population, land area, density, and how the region compares to national averages.

Combined areas are built from whole counties, listed below. Statistics aggregate the member counties' census tracts.

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