Duncan township, Illinois
Duncan township profile, demographic data, and geographic information.
Duncan township is a geographic entity located in Mercer County, Illinois. As of official census estimates, it has a reported population of 255. The land area covers 36.64 sq mi. [1]
Demographics & Population
| Demographic Metric | Estimate / Count | Margin of Error | Survey Period / Source |
|---|---|---|---|
| Total Population (2025 PEP Estimate) | 255 | — | 2025 / Census |
| Median Age | 62.4 yrs | ±24.6 | 2020-2024 / Census ACS 5-Year 2024 |
| Total Households | 112 | ±45 | 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 | 112 | ±45 |
| Occupied Housing Units | 112 | ±45 |
| Vacant Housing Units | 0 | ±13 |
| Median Home Value | $223,100 | ±$21,479 |
| Median Gross Rent | Suppressed | — |
Source: U.S. Census Bureau ACS 5-Year (2020-2024).
Economy & Workforce
| Economic Metric | Estimate / Value | Margin of Error |
|---|---|---|
| Median Household Income | Suppressed | — |
| Per Capita Income | $36,465 | ±$10,560 |
| Poverty Rate | 9.3% | ±13.4% |
| Population Below Poverty Level | 20 | ±30 |
| Unemployment Rate | 0% | ±10.5% |
| Civilian Labor Force, Employed | 124 | ±56 |
| Broadband Internet Rate | 100% | ±0% |
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 DUNCAN
GUS Population: 257 (2024)
ID: 103052
|
Township | Official Local Government |
Contact: SUPERVISOR
1226 145TH AVE, JOY IL 61260-8527
|
|
GUS Population: 15,292 (2024)
ID: 162152
|
County | Official County Government |
Contact: MERCER COUNTY CLERK
COUNTY BUILDING, ALEDO IL 61231
|
Education
Listing 10 local institutions (NCES 2024-2025)
External reference via K12Guides
| Institution | Type | Grades | Location |
|---|---|---|---|
| Regular School Nearby | 03-05 | Andalusia, IL | |
| Regular School Nearby | KG-05 | Aledo, IL | |
| Regular School Nearby | PK-05 | Buffalo, IA | |
| Regular School Nearby | PK-06 | Rock Island, IL | |
| Regular School Nearby | 07-08 | Rock Island, IL | |
| Regular School Nearby | KG-06 | Rock Island, IL | |
| Regular School Nearby | PK-06 | Rock Island, IL | |
| Regular School Nearby | KG-06 | Muscatine, IA | |
| Regular School Nearby | KG-06 | Muscatine, IA | |
| Regular School Nearby | KG-02 | Illinois City, 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 |
|---|---|---|---|---|
|
Trinity College of Nursing & Health Sciences
|
College | 20.3 mi away | 2122 25th Avenue, Rock Island, IL, 61201-5317 |
3097797700
|
|
EDWARDS RIVER PUBLIC LIBRARY DISTRICT
|
Library | 7.4 mi away | 412 EAST MAIN STREET, ALEDO, IL, 61231 |
(309) 582-2032
|
|
Augustana College
|
College | 21.8 mi away | 639 38th St, Rock Island, IL, 61201-2296 |
3097947000
|
|
ANDALUSIA TOWNSHIP LIBRARY
|
Library | 12.9 mi away | 503 SECOND STREET WEST, ANDALUSIA, IL, 61232 |
(309) 798-2542
|
|
Eastern Iowa Community College District
|
College | 22.0 mi away | 101 W Third Street, Davenport, IA, 52801-1221 |
5633363300
|
|
BUFFALO BRANCH
|
Library | 14.1 mi away | 329 DODGE ST, BUFFALO, IA, 52728 |
(319) 381-1797
|
|
Palmer College of Chiropractic
|
College | 22.3 mi away | 1000 Brady St, Davenport, IA, 52803-5287 |
5638845000
|
|
MUSSER PUBLIC LIBRARY
|
Library | 14.3 mi away | 408 E 2ND ST, MUSCATINE, IA, 52761 |
(563) 263-3065
|
|
Saint Ambrose University
|
College | 22.8 mi away | 518 W Locust St, Davenport, IA, 52803-2898 |
5633336000
|
|
VIOLA PUBLIC LIBRARY DISTRICT
|
Library | 14.6 mi away | 1701 SEVENTEENTH STREET, VIOLA, IL, 61486 |
(309) 596-2620
|
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 ALEDO, IL US, located 7.6 miles from Duncan township. Local microclimates, topography, and elevation may cause municipal conditions to differ.
| Month | High (°F) | Low (°F) | Mean (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|---|
| January | 31.0° | 13.3° | 22.2° | 1.67" | 6.2" |
| February | 35.6° | 17.0° | 26.3° | 1.85" | 6.2" |
| March | 49.1° | 27.4° | 38.2° | 2.52" | 3.0" |
| April | 62.1° | 37.9° | 50.0° | 4.00" | 0.6" |
| May | 72.7° | 49.7° | 61.2° | 5.06" | 0.0" |
| June | 81.7° | 59.8° | 70.7° | 5.37" | 0.0" |
| July | 84.7° | 63.4° | 74.1° | 3.86" | 0.0" |
| August | 83.1° | 61.5° | 72.3° | 3.89" | 0.0" |
| September | 76.9° | 53.2° | 65.1° | 3.73" | 0.0" |
| October | 64.1° | 41.3° | 52.7° | 2.82" | 0.3" |
| November | 49.3° | 29.5° | 39.4° | 2.32" | 1.4" |
| December | 36.4° | 19.6° | 28.0° | 2.01" | 4.1" |
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 |
|---|---|---|---|
| Millersburg CDP | CDP | 2.9 mi | — |
| Buffalo Prairie CDP | CDP | 4.4 mi | — |
| Joy village | Village | 5.8 mi | — |
| Hamlet CDP | CDP | 6.3 mi | — |
| Eliza CDP | CDP | 6.7 mi | — |
| Aledo city | City | 7.5 mi | — |
Sources & Data Provenance
- Geographic Classification & Identifiers: U.S. Census Bureau Gazetteer (2026) and TIGER/Line Shapefiles. GEOID: 1713120968. • 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.