Illinois
102 counties and 2,872 townships, towns, villages and census designated places have a page.
- Census data · ACS 2019-2023
- 4,432 public schools
- 12,710,158 (2024 estimate)Population
- 102Counties
- 2,872Towns with a page
- 4,432Public schools
- $81,702Median household income
- $250,500Median home value
All 102 countiesA to Z
Source: Census Gazetteer 2025: counties, retrieved November 14, 2026.
Largest towns in IllinoisCensus population estimate
Illinois against the United StatesOfficial sources, refreshed yearly
| Measure | Illinois | United States |
|---|---|---|
| Population | 12,692,653 | 332,387,540 |
| Median household income | $81,702 | $78,538 |
| Median age | 38.9 | 38.7 |
| Median home value | $250,500 | $303,400 |
| Bachelor’s degree or higher | 37.2% | 35.0% |
| Foreign-born residents | 14.4% | 13.9% |
| Owner-occupied homes | 66.8% | 65.0% |
| Mean commute to work | 28.1 minutes | 26.6 minutes |
Sources: American Community Survey 5-year data profile 2019–2023, state level, state 17, retrieved November 14, 2026; American Community Survey 5-year data profile 2019–2023, the United States, retrieved November 14, 2026.
| Census | Population |
|---|---|
| 2000 | 12,419,293 |
| 2010 | 12,830,632 |
| 2020 | 12,812,508 |
As counted at each census, within the boundaries the area had then; the current estimate is in the glance card.
Sources: Census 2000 Summary File 1: total population, state level, state 17, retrieved November 14, 2026; Census 2010 Summary File 1: total population, state level, state 17, retrieved November 14, 2026; Census 2020 Redistricting Data (P.L. 94-171): total population, state level, state 17, retrieved November 14, 2026.
Median household income $81,702 · Share of households by income, American Community Survey 5-year 2019-2023, table S1901.
Source: American Community Survey 5-year subject table S1901 (household income) 2019–2023, state level, state 17, retrieved November 14, 2026.
- Owner occupied
- 3,343,034 units
- Renter occupied
- 1,658,870 units
- Vacancy rate
- 8.1%
Occupied housing units by tenure and the share of all units vacant, American Community Survey 5-year 2019-2023, table DP04.
Source: American Community Survey 5-year data profile 2019–2023, state level, state 17, retrieved November 14, 2026.
5,661,761 employees in 322,415 establishments with payroll in 2023, all sectors; employers themselves are not named in the source. County Business Patterns counts are published with noise.
Source: County Business Patterns 2023: employment by sector, state level, state 17, retrieved November 14, 2026.