Flossmoor, Illinois population
Incorporated place · Official geographic code 1726571 · Census name: Flossmoor village
· Annual resident population estimate
U.S. Census Bureau · Population Estimates Program · Vintage 2025
-18 residents (-0.19%) since July 1, 2024.
- Population change, 2020–2025
- -288July 1 to July 1 · -2.99%
- Land-area density, 2025
- 2,552.4People per square mile · 2025 land area
- Population rank, 2025
- 3352 of 19,471Active whole incorporated places; balances excluded
Flossmoor population history
Open historical explorerThese six July 1 estimates belong to one consistent Vintage 2025 series. The Census Bureau revises earlier years when it releases a new vintage; a figure from an older publication may differ from the value below.
Annual estimates · 2020–2025 · Vertical scale shown on chart.
The highest observed population in this annual series was 9,646 in 2020. This is a peak within 2020–2025 coverage, not an all-time record.
| Reference date | Population | Annual change |
|---|---|---|
| July 1, 2020 | 9,646 | — |
| July 1, 2021 | 9,469 | -177 |
| July 1, 2022 | 9,332 | -137 |
| July 1, 2023 | 9,317 | -15 |
| July 1, 2024 | 9,376 | +59 |
| July 1, 2025 | 9,358 | -18 |
Why is the April 2020 estimates base different from a census count?
The PEP estimates base here is 9,683 residents on April 1, 2020. It incorporates the Census Bureau’s corrections and geographic revisions and serves as the starting point for this annual series. It is not labeled an original 2020 census count. The chart starts at July 1, 2020, so its five-year change uses two July observations. Read about measurement types.
Growth and density
Between July 1, 2020 and July 1, 2025, Flossmoor lost 288 residents, a 2.99% decrease. The annualized change over these five elapsed years was -0.60%. Annualized change is a summary of the interval; it does not imply that the population changed at that rate in every year.
The 2025 Gazetteer reports 3.67 square miles of land. Dividing the July 1, 2025 population by that compatible land area gives 2,552.4 people per square mile. Water area is excluded. Density depends on geographic boundaries. It describes this entire place, rather than a typical neighborhood or built-up area.
Calculations use unrounded source values. Population counts are displayed as integers, percentages to two decimals and density to one decimal. Calculation methods · Growth calculator
Population characteristics and migration
This incorporated-place totals file does not provide city-level births, deaths, migration components or age distributions. Those statistics are not estimated from a county’s values here. County profiles provide supported change components, while age characteristics require a separately labeled PEP or ACS product. See characteristics coverage.
Geographic context
This is the whole incorporated-place record, not a metropolitan-area population. A place can span more than one county; the county links below come from published county/place-part relationships. County totals are context and are not substitutes for a city observation.
| Place | Population · 2025 | Change · 2024–25 | Growth · 2024–25 | People / sq. mi. |
|---|---|---|---|---|
| Cook CountyIllinois · County equivalent · 17031 | 5,194,625 | +5,834 | +0.11% | 5,497.4 |
Showing 1 of 1 related records.
Illinois population · State city directory · City proper versus county versus metro
Places with nearby population ranks
Selected from the same 2025 comparison universe, using neighboring population ranks. Similar population does not imply similar density, boundaries or demographics.
| Place | Population · 2025 | Change · 2024–25 | Growth · 2024–25 | People / sq. mi. |
|---|---|---|---|---|
| Oak GroveMissouri · Incorporated place · 2953624 | 9,370 | +239 | +2.62% | 1,461.6 |
| AngolaIndiana · Incorporated place · 1801666 | 9,366 | -39 | -0.41% | 1,394.0 |
| WhitefishMontana · Incorporated place · 3079825 | 9,358 | +104 | +1.12% | 1,266.2 |
| StegerIllinois · Incorporated place · 1772520 | 9,352 | -29 | -0.31% | 2,746.3 |
Source, citation and downloads
U.S. Census Bureau, Population Estimates Program, Vintage 2025, sub-est2025.csv, variable POPESTIMATE2025; Flossmoor village, Illinois, geographic code 1726571; resident population 9,358 on July 1, 2025; boundaries January 1, 2025. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/cities/totals/sub-est2025.csv. Retrieved September 30, 2026. US Population Data snapshot pep-2025-r1, transformation 1.
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