Data / Population / Montgomery County

Population in Montgomery County

Population in Montgomery County was 28,076 in 2025, according to the U.S. Census Bureau. That is up 0.9% from 2024. That is the 48th highest of 102 counties in 2025.

2025, persons28,076
Change on 2024+0.9%
Rank48th of 102Counties in Illinois ranked
Series high28,2442020
Series low27,7912023

Population in Montgomery County, 2020 to 2025

CSVChart (SVG)

27.7K27.8K27.9K28K28.1K28.2K28.3K2020202120222023202420252020: 28,244 persons2021: 28,128 persons2022: 27,958 persons2023: 27,791 persons2024: 27,837 persons2025: 28,076 persons
persons. Source: U.S. Census Bureau. Retrieved 2026-10-08, published 2026-03-26.
All 6 values
Periodpersons
202528,076
202427,837
202327,791
202227,958
202128,128
202028,244

Compared with Illinois and United States

Place2025
Montgomery County28,076
Illinois12,719,141
United States341,784,857

Rankings

Definition

Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.

For Denmark, Statistics Denmark counts the registered resident population on 1 January. Greenland and the Faroe Islands are excluded. The annual series selects the first-quarter reference date from FOLK1A. The World Bank series exists for every country, so use it (through compare) to rank countries on one basis.

How to cite

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.

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What is the latest population in Montgomery County? Cite the source.
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Questions

What is the population in Montgomery County?

Population in Montgomery County was 28,076 in 2025, according to the U.S. Census Bureau. That is up 0.9% from 2024. That is the 48th highest of 102 counties in 2025.

Where does this figure come from?

U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). Retrieved by Invokely on 2026-10-08.

What was the highest population in Montgomery County?

28,244 in 2020, the highest value since 2020 in this series.

More statistics for Montgomery County

All statistics for Montgomery County