Independent community site, not affiliated with any government.
HelpSponsor a town
USATownHub
Join your town

St. Clair County, Illinois

St. Clair County, Illinois · ZIP 62059, 62201, 62203

  • Census data · ACS 2019-2023
Browse the 50 townsFind my townSponsor a town here
  • 251,149 (2024 estimate)Population
  • 101,273Households
  • $70,178Median household income
  • $168,800Median home value
  • 50Towns with a page
  • 32ZIP codes

St. Clair County in numbersOfficial sources, refreshed yearly

Population, 2000 to 2020+0.5%
255k260k265k270k275k2000: 256,08220002010: 270,05620102020: 257,4002020256,082257,400
Population of St. Clair County at each census
CensusPopulation
2000256,082
2010270,056
2020257,400

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, county level, state 17, retrieved November 14, 2026; Census 2010 Summary File 1: total population, county level, state 17, retrieved November 14, 2026; Census 2020 Redistricting Data (P.L. 94-171): total population, county level, state 17, retrieved November 14, 2026.

Household income in St. Clair County
Under $50k37.1%
$50k to $100k29.1%
$100k to $150k15.9%
$150k to $200k9.3%
$200k and over8.7%

Median household income $70,178 · 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, county level, state 17, retrieved November 14, 2026.

Housing tenure in St. Clair County
Owner occupied
68,653 units
Renter occupied
32,620 units
Vacancy rate
12.2%

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, county level, state 17, retrieved November 14, 2026.

Jobs by sector in St. Clair County2023
Health care and social assistance13,767
Retail trade11,974
Accommodation and food services10,220
Manufacturing5,461
Transportation and warehousing5,197
Professional, scientific, and technical services4,257
Construction4,185
Administrative and support and waste management and remediation services4,080

72,871 employees in 4,973 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, county level, state 17, retrieved November 14, 2026.

St. Clair County compared with its state
St. Clair County compared with its state, American Community Survey 2019-2023
MeasureSt. Clair CountyIllinois
Population254,77712,692,653
Median household income$70,178$81,702
Median age39.538.9
Median home value$168,800$250,500
Bachelor’s degree or higher30.7%37.2%
Foreign-born residents3.2%14.4%
Owner-occupied homes67.8%66.8%
Mean commute to work24.7 minutes28.1 minutes

Source: American Community Survey 5-year data profile 2019–2023, county level, state 17, retrieved November 14, 2026.

Townships, towns and villages in St. Clair County50 with a page · sort by any column

Type
BellevilleCity40,56023.2 sq mi
St. Clair TownshipTownship35,56020.4 sq mi
Caseyville TownshipTownship34,69934.9 sq mi
O'FallonCity32,16915.8 sq mi
O'Fallon TownshipTownship26,66635.1 sq mi
Centreville TownshipTownship19,25327.9 sq mi
East St. LouisCity17,80813.9 sq mi
Cahokia HeightsCity17,05215.8 sq mi
Fairview HeightsCity16,11511.5 sq mi
ShilohVillage14,75412.7 sq mi
SwanseaVillage14,4456.48 sq mi
Shiloh Valley TownshipTownship12,85831.8 sq mi
Mascoutah TownshipTownship9,76139.1 sq mi
MascoutahCity9,1189.64 sq mi
Stookey TownshipTownship8,85926.6 sq mi
Canteen TownshipTownship7,76617.0 sq mi
Sugar Loaf TownshipTownship6,64330.6 sq mi
Millstadt TownshipTownship6,52846.8 sq mi
Freeburg TownshipTownship4,94734.3 sq mi
LebanonCity4,6282.69 sq mi
FreeburgVillage4,5186.82 sq mi
CaseyvilleVillage4,3957.30 sq mi
Lebanon TownshipTownship4,30136.5 sq mi
Scott AFBCensus designated place4,1954.34 sq mi
Smithton TownshipTownship4,03932.3 sq mi
MillstadtVillage3,9573.55 sq mi
SmithtonVillage3,8884.51 sq mi
DupoVillage3,7976.40 sq mi
Prairie Du Long TownshipTownship2,56735.5 sq mi
Washington ParkVillage2,4812.55 sq mi
New Athens TownshipTownship2,42534.0 sq mi
Fairmont CityVillage2,1696.20 sq mi
Marissa TownshipTownship2,16734.4 sq mi
New AthensVillage1,8702.11 sq mi
MarissaVillage1,7437.21 sq mi
Fayetteville TownshipTownship1,47843.0 sq mi
Lenzburg TownshipTownship91028.9 sq mi
Engelmann TownshipTownship73029.6 sq mi
Stites TownshipTownship6242.05 sq mi
BrooklynVillage6230.81 sq mi
St. LiboryVillage6080.97 sq mi
LenzburgVillage4481.15 sq mi
East CarondeletVillage3731.18 sq mi
SummerfieldVillage3310.52 sq mi
FayettevilleVillage2860.30 sq mi
SaugetVillage1344.60 sq mi
DarmstadtCensus designated place00.07 sq mi
FloravilleCensus designated place00.08 sq mi
PaderbornCensus designated place00.15 sq mi
RentchlerCensus designated place00.31 sq mi

Populations: Census Population Estimates, Vintage 2024: subcounty totals, state 17 (2024). Land areas: Census Gazetteer 2025: counties. A dash means the figure is not in the cited file.

County officialsFrom public records

No county official is published yet. Names appear once a researcher drafts them from the county’s own site and a second person approves; office contacts only, never personal details.

Across St. Clair County

Jobs across St. Clair County

No job is posted in St. Clair County’s towns yet. Employers post from their business dashboard; public job banks are added once their terms are recorded.

Browse jobs by townPost a job
Events in the next 31 days

No upcoming event is listed in St. Clair County's towns yet. Members and businesses add events from any town page.

Latest postsRolled up from the towns

Nothing has been posted in St. Clair County’s towns yet. Join a town to start its feed.

Neighboring counties

Neighboring counties

Sources: Census county adjacency file 2024, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 17, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 29, retrieved November 14, 2026.