Illiopolis township, Illinois
Illiopolis township profile, demographic data, and geographic information.
Illiopolis township is a geographic entity located in Sangamon County, Illinois. As of official census estimates, it has a reported population of 1,198. The land area covers 33.98 sq mi. [1]
Demographics & Population
| Demographic Metric | Estimate / Count | Margin of Error | Survey Period / Source |
|---|---|---|---|
| Total Population (2025 PEP Estimate) | 1,198 | — | 2025 / Census |
| Median Age | 42.6 yrs | ±8.6 | 2020-2024 / Census ACS 5-Year 2024 |
| Total Households | 592 | ±102 | 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 | 616 | ±102 |
| Occupied Housing Units | 592 | ±102 |
| Vacant Housing Units | 24 | ±18 |
| Median Home Value | $138,300 | ±$39,443 |
| Median Gross Rent | $825 | ±$363 |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Economy & Workforce
| Economic Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Median Household Income | $83,000 | ±$21,903 |
| Per Capita Income | $39,211 | ±$3,932 |
| Poverty Rate | 6.8% | ±4.6% |
| Population Below Poverty Level | 101 | ±70 |
| Unemployment Rate | 4.1% | ±3% |
| Civilian Labor Force, Employed | 628 | ±116 |
| Broadband Internet Rate | 82.9% | ±6.1% |
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 |
|---|---|---|---|
|
TOWNSHIP OF ILLIOPOLIS
GUS Population: 1,204 (2024)
ID: 163291
|
Township | Official Local Government |
Contact: SUPERVISOR
PO BOX 107, ILLIOPOLIS IL 62539-0107
|
|
GUS Population: 194,345 (2024)
ID: 194545
|
County | Official County Government |
Contact: DEP. AUDITOR
200 S 9TH ST, STE 201, SPRINGFIELD IL 62701-1967
|
Education
Listing 10 local institutions (NCES 2024-2025)
External reference via K12Guides
| Institution | Type | Grades | Location |
|---|---|---|---|
| Regular School Illiopolis | 03-05 | Illiopolis, IL | |
| Regular School Illiopolis | 06-08 | Illiopolis, IL | |
| Regular School Nearby | KG-08 | Decatur, IL | |
| Regular School Nearby | PK-04 | Edinburg, IL | |
| Regular School Nearby | 09-12 | Edinburg, IL | |
| Regular School Nearby | 05-08 | Edinburg, IL | |
| Regular School Nearby | KG-06 | Decatur, IL | |
| Regular School Nearby | 09-12 | Decatur, IL | |
| Regular School Nearby | PK-05 | Blue Mound, IL | |
| Regular School Nearby | 09-12 | Macon, 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 |
|---|---|---|---|---|
|
Millikin University
|
College | 15.2 mi away | 1184 W Main St, Decatur, IL, 62522-2084 |
2174246211
|
|
ILLIOPOLIS/NIANTIC PUBLIC LIBRARY DISTRICT
|
Library | 1.2 mi away | 401 SIXTH AND MARY STREET, ILLIOPOLIS, IL, 62539 |
(217) 486-5561
|
|
Reflections Academy of Beauty
|
College Vocational | 16.5 mi away | 3122 Brettwood Cir, Decatur, IL, 62526 |
2174259117
|
|
TRI-CITY PUBLIC LIBRARY DISTRICT
|
Library | 7.7 mi away | 600 SOUTH MAIN STREET, BUFFALO, IL, 62515 |
(217) 364-8181
|
|
Midwest Technical Institute-Illinois
|
College Vocational | 17.7 mi away | 2731 Farmers Market Road, Springfield, IL, 62707 |
2175278324
|
|
MOUNT PULASKI PUBLIC LIBRARY DISTRICT
|
Library | 10.5 mi away | 320 NORTH WASHINGTON STREET, MOUNT PULASKI, IL, 62548 |
(217) 792-5919
|
|
Richland Community College
|
College | 19.6 mi away | One College Park, Decatur, IL, 62521-8513 |
2178757200
|
|
BARCLAY PUBLIC LIBRARY DISTRICT
|
Library | 11.6 mi away | 220 SOUTH MAIN STREET, WARRENSBURG, IL, 62573 |
(217) 672-3621
|
|
St. John's College-Department of Nursing
|
College | 20.7 mi away | 729 E. Carpenter St, Springfield, IL, 62702 |
2175255628
|
|
BLUE MOUND MEMORIAL LIBRARY DISTRICT
|
Library | 13.3 mi away | 213 NORTH SAINT MARIE STREET, BLUE MOUND, IL, 62513 |
(217) 692-2774
|
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 DECATUR WTP, IL US, located 16.7 miles from Illiopolis township. Local microclimates, topography, and elevation may cause municipal conditions to differ.
| Month | High (°F) | Low (°F) | Mean (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|---|
| January | 34.0° | 19.7° | 26.9° | 2.40" | 5.9" |
| February | 39.1° | 23.5° | 31.3° | 2.00" | 2.5" |
| March | 50.8° | 32.8° | 41.8° | 2.64" | 0.9" |
| April | 63.4° | 43.3° | 53.3° | 4.12" | 0.4" |
| May | 73.5° | 53.8° | 63.7° | 4.95" | 0.0" |
| June | 82.2° | 63.1° | 72.6° | 4.73" | 0.0" |
| July | 84.7° | 66.5° | 75.6° | 4.00" | 0.0" |
| August | 83.5° | 64.9° | 74.2° | 3.50" | 0.0" |
| September | 77.7° | 57.0° | 67.3° | 3.08" | 0.0" |
| October | 65.3° | 45.7° | 55.5° | 3.41" | 0.0" |
| November | 50.3° | 34.3° | 42.3° | 3.21" | 0.4" |
| December | 38.6° | 25.0° | 31.8° | 2.40" | 3.5" |
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 |
|---|---|---|---|
| Illiopolis village | Village | 1.0 mi | — |
| Niantic village | Village | 5.2 mi | — |
| Mount Auburn village | Village | 6.6 mi | — |
| Buffalo village | Village | 7.8 mi | — |
| Latham village | Village | 9.0 mi | — |
| Mechanicsburg village | Village | 9.0 mi | — |
Sources & Data Provenance
- Geographic Classification & Identifiers: U.S. Census Bureau Gazetteer (2026) and TIGER/Line Shapefiles. GEOID: 1716737140. • 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.