Data / Population density / Monroe County

Population density in Monroe County

Population density in Monroe County was 34.9 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is down 0.8% from 2024. That is the 25th highest of 102 counties in 2025.

2025, inhabitants per km²34.9
Change on 2024-0.8%
Rank25th of 102Counties in Illinois ranked
Series high35.32023
Series low34.92025

Population density in Monroe County, 2020 to 2025

CSVChart (SVG)

34.93535.135.235.32020202120222023202420252020: 35 inhabitants per km²2021: 35.1 inhabitants per km²2022: 35.2 inhabitants per km²2023: 35.3 inhabitants per km²2024: 35.2 inhabitants per km²2025: 34.9 inhabitants per km²
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09, published 2026-03-26.
All 6 values
Periodinhabitants per km²
202534.9
202435.2
202335.3
202235.2
202135.1
202035

Compared with Illinois and United States

Place2025
Monroe County34.9
Illinois88.5
United States37.3

Rankings

Definition

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

What is the population density in Monroe County?

Population density in Monroe County was 34.9 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is down 0.8% from 2024. That is the 25th highest of 102 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved by Invokely on 2026-10-09.

What was the highest population density in Monroe County?

35.3 inhabitants per km² in 2023, the highest value since 2020 in this series.

More statistics for Monroe County

All statistics for Monroe County