St. Clair township, Illinois
St. Clair township profile, demographic data, and geographic information.
St. Clair township is a geographic entity located in St. Clair County, Illinois. As of official census estimates, it has a reported population of 35,372. The land area covers 20.36 sq mi. [1]
Demographics & Population
| Demographic Metric | Estimate / Count | Margin of Error | Survey Period / Source |
|---|---|---|---|
| Total Population (2025 PEP Estimate) | 35,372 | — | 2025 / Census |
| Median Age | 42.4 yrs | ±1.4 | 2020-2024 / Census ACS 5-Year 2024 |
| Total Households | 14,902 | ±543 | 2020-2024 / Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).
Housing & Real Estate Profile
| Housing Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Total Housing Units | 15,795 | ±526 |
| Occupied Housing Units | 14,902 | ±543 |
| Vacant Housing Units | 893 | ±330 |
| Median Home Value | $202,000 | ±$11,632 |
| Median Gross Rent | $1,120 | ±$50 |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Economy & Workforce
| Economic Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Median Household Income | $80,309 | ±$5,616 |
| Per Capita Income | $42,898 | ±$2,299 |
| Poverty Rate | 11.7% | ±2.2% |
| Population Below Poverty Level | 4,144 | ±764 |
| Unemployment Rate | 4.8% | ±1.3% |
| Civilian Labor Force, Employed | 17,804 | ±992 |
| Broadband Internet Rate | 92.8% | ±1.9% |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Local Government & Public Administration
Authoritative general-purpose local government units serving this area
U.S. Census Bureau GUS (2026) / GMAF
| Government Unit | Unit Type | Jurisdiction Role | Contact / Address |
|---|---|---|---|
|
GUS Population: 35,560 (2024)
ID: 125325
|
Township | Official Local Government |
Contact: TOWNSHIP SUPERVISOR
107 SERVICE ST, SWANSEA IL 62226-3943
|
|
GUS Population: 251,149 (2024)
ID: 162161
|
County | Official County Government |
Contact: AUDITOR
10 PUBLIC SQ, BELLEVILLE IL 62220-1623
|
Education
Listing 10 local institutions (NCES 2024-2025)
External reference via K12Guides
| Institution | Type | Grades | Location |
|---|---|---|---|
| Regular School Nearby | 06-08 | ST. LOUIS, MO | |
| Alternative School Nearby | 06-12 | Cahokia, IL | |
| Regular School Nearby | PK-06 | ST LOUIS, MO | |
| Regular School Nearby | PK-05 | ST LOUIS, MO | |
| Regular School Nearby | PK-06 | ST LOUIS, MO | |
| Regular School Nearby | PK-02 | ST. LOUIS, MO | |
| Regular School Nearby | PK-04 | ST.LOUIS, MO | |
| Regular School Nearby | KG-06 | Belleville, IL | |
| Regular School Nearby | 03-05 | Glen Carbon, IL | |
| Regular School Nearby | 06-08 | O Fallon, IL |
Source: k12guides.com.
Community Facilities & Infrastructure
Displaying 10 civic institutions across 2 datasets queried
CMS • IPEDS • IMLS
| Facility Name | Category | Relationship | Address / Location | Contact |
|---|---|---|---|---|
|
Southwestern Illinois College
|
College | 3.2 mi away | 2500 Carlyle Ave, Belleville, IL, 62221-5899 |
6182352700
|
|
BELLEVILLE PUBLIC LIBRARY
|
Library | 1.5 mi away | 121 EAST WASHINGTON STREET, BELLEVILLE, IL, 62220 |
(618) 234-0441
|
|
McKendree University
|
College | 10.2 mi away | 701 College Rd, Lebanon, IL, 62254-1291 |
6185374481
|
|
BELLEVILLE PUBLIC LIBRARY BOOKMOBILE
|
Library | 1.5 mi away | 121 EAST WASHINGTON STREET, BELLEVILLE, IL, 62220 |
(618) 234-9474
|
|
Stevens-The Institute of Business & Arts
|
College | 13.8 mi away | 1521 Washington Avenue, Saint Louis, MO, 63103 |
31442109491101
|
|
WEST BRANCH LIBRARY
|
Library | 1.9 mi away | 3414 W. MAIN STREET, BELLEVILLE, IL, 62226 |
(618) 233-4366
|
|
Ponce Health Sciences University-St Louis
|
College | 14.4 mi away | 2351 Market St., St. Louis, MO, 63103 |
3148871350
|
|
FAIRVIEW HEIGHTS PUBLIC LIBRARY
|
Library | 4.8 mi away | 10017 BUNKUM ROAD, FAIRVIEW HEIGHTS, IL, 62208 |
(618) 489-2070
|
|
Harris-Stowe State University
|
College | 14.9 mi away | 3026 Laclede Ave, Saint Louis, MO, 63103-2136 |
3143403366
|
|
O'FALLON PUBLIC LIBRARY
|
Library | 4.9 mi away | 120 CIVIC PLAZA, O'FALLON, IL, 62269 |
(618) 632-3783
|
Distances calculated from authoritative source coordinates. Source: CMS, IMLS, NCES IPEDS.
Climate & Weather Observations
NOAA Monthly Climate Normals
Observation Station: Climate data reflects NOAA 1991–2020 standard normals recorded at BELLEVILLE SIU RSCH, IL US, located 7.2 miles from St. Clair township. Local microclimates, topography, and elevation may cause municipal conditions to differ.
| Month | High (°F) | Low (°F) | Mean (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|---|
| January | 42.9° | 24.3° | 33.6° | 2.56" | 3.4" |
| February | 48.6° | 28.0° | 38.3° | 2.16" | 3.3" |
| March | 59.2° | 36.3° | 47.8° | 3.44" | 1.0" |
| April | 70.6° | 46.0° | 58.3° | 4.90" | 0.0" |
| May | 79.1° | 56.3° | 67.7° | 5.05" | 0.0" |
| June | 87.3° | 64.5° | 75.9° | 4.62" | 0.0" |
| July | 90.2° | 67.8° | 79.0° | 4.03" | 0.0" |
| August | 89.1° | 65.3° | 77.2° | 3.92" | 0.0" |
| September | 83.3° | 56.9° | 70.1° | 3.35" | 0.0" |
| October | 72.6° | 46.7° | 59.7° | 3.12" | 0.0" |
| November | 58.1° | 36.9° | 47.5° | 3.60" | 0.6" |
| December | 46.3° | 28.3° | 37.3° | 2.61" | 2.9" |
Source: NOAA U.S. Climate Normals (1991–2020).
Local Weather Forecast
Weather forecast data is currently unavailable in the local cache.
Nearby Cities & Communities
Listing adjacent communities by spatial proximity (miles)
Proximity discovery
| Community Name | Classification | Distance | Population |
|---|---|---|---|
| Swansea village | Village | 1.3 mi | — |
| Belleville city | City | 1.4 mi | — |
| Shiloh village | Village | 3.6 mi | — |
| Fairview Heights city | City | 4.5 mi | — |
| O'Fallon city | City | 5.7 mi | — |
| Rentchler CDP | CDP | 6.6 mi | — |
Sources & Data Provenance
- Geographic Classification & Identifiers: U.S. Census Bureau Gazetteer (2026) and TIGER/Line Shapefiles. GEOID: 1716366729. • Official Source Dataset →
- Socioeconomic & Housing Metrics: U.S. Census Bureau American Community Survey (ACS) 5-year estimates and Population Estimates Program (PEP). Margin of Error (MOE) intervals are reported where published; suppressed values are never estimated or replaced with false zeros.
- Civic Directory Datasets: Centers for Medicare & Medicaid Services (CMS Hospital Directory), National Center for Education Statistics (NCES IPEDS Postsecondary Directory), and Institute of Museum and Library Services (IMLS Public Libraries Survey). Airport landing facilities are provided by airport-data.com.
- Weather & Climate Observations: National Oceanic and Atmospheric Administration (NOAA) U.S. Climate Normals 1991–2020 and National Weather Service (NWS) point forecasts.