Seneca township, Illinois
Seneca township profile, demographic data, and geographic information.
Seneca township is a geographic entity located in McHenry County, Illinois. As of official census estimates, it has a reported population of 2,862. The land area covers 35.87 sq mi. [1]
Demographics & Population
| Demographic Metric | Estimate / Count | Margin of Error | Survey Period / Source |
|---|---|---|---|
| Total Population (2025 PEP Estimate) | 2,862 | — | 2025 / Census |
| Median Age | 44.7 yrs | ±7.9 | 2020-2024 / Census ACS 5-Year 2024 |
| Total Households | 1,017 | ±188 | 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 | 1,142 | ±204 |
| Occupied Housing Units | 1,017 | ±188 |
| Vacant Housing Units | 125 | ±123 |
| Median Home Value | $408,900 | ±$55,681 |
| 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 | $133,558 | ±$22,855 |
| Per Capita Income | $53,212 | ±$12,394 |
| Poverty Rate | 4.6% | ±5.4% |
| Population Below Poverty Level | 133 | ±155 |
| Unemployment Rate | 7.8% | ±5.7% |
| Civilian Labor Force, Employed | 1,491 | ±183 |
| Broadband Internet Rate | 97% | ±3.1% |
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 SENECA
GUS Population: 2,882 (2024)
ID: 163119
|
Township | Official Local Government |
Contact: SUPERVISOR
16506 GARDEN VALLEY RD, WOODSTOCK IL 60098-9029
|
|
GUS Population: 315,959 (2024)
ID: 162147
|
County | Official County Government |
Contact: AUDITOR
2200 N SEMINARY AVE, WOODSTOCK IL 60098-2693
|
Education
Listing 10 local institutions (NCES 2024-2025)
External reference via K12Guides
| Institution | Type | Grades | Location |
|---|---|---|---|
| Regular School Seneca | 05-08 | Seneca, IL | |
| Regular School Seneca | PK-04 | Seneca, IL | |
| Regular School Seneca | 09-12 | Seneca, IL | |
| Regular School Nearby | PK-05 | Hebron, IL | |
| Regular School Nearby | 09-12 | Hebron, IL | |
| Regular School Nearby | 06-08 | Hebron, IL | |
| Regular School Nearby | KG-05 | Algonquin, IL | |
| Regular School Nearby | 06-08 | Algonquin, IL | |
| Regular School Nearby | KG-05 | Hampshire, IL | |
| Regular School Nearby | 01-05 | Cary, 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 |
|---|---|---|---|---|
|
McHenry County College
|
College | 8.3 mi away | 8900 US Hwy 14, Crystal Lake, IL, 60012-2761 |
8154553700
|
|
WOODSTOCK PUBLIC LIBRARY
|
Library | 4.1 mi away | 414 WEST JUDD STREET, WOODSTOCK, IL, 60098 |
(815) 338-0542
|
|
First Institute of Travel, Inc.
|
College Vocational | 10.7 mi away | 790 McHenry Avenue, Crystal Lake, IL, 60014 |
8154593500
|
|
MARENGO-UNION PUBLIC LIBRARY DISTRICT
|
Library | 4.7 mi away | 19714 EAST GRANT HIGHWAY, MARENGO, IL, 60152 |
(815) 568-8236
|
|
Cosmetology & Spa Academy
|
College Vocational | 12.2 mi away | 700 E. Terra Cotta, Crystal Lake, IL, 60014 |
8154555900
|
|
HARVARD DIGGINS LIBRARY
|
Library | 10.1 mi away | 900 EAST MCKINLEY STREET, HARVARD, IL, 60033 |
(815) 943-4671
|
|
Judson University
|
College | 19.9 mi away | 1151 N State St, Elgin, IL, 60123-1498 |
8476282500
|
|
HUNTLEY AREA PUBLIC LIBRARY DISTRICT
|
Library | 10.2 mi away | 11000 RUTH ROAD, HUNTLEY, IL, 60142 |
(847) 669-5386
|
|
Tricoci University of Beauty Culture-Elgin
|
College Vocational | 20.5 mi away | 264 South Randall Road, Elgin, IL, 60123-9412 |
6305283330
|
|
CRYSTAL LAKE PUBLIC LIBRARY
|
Library | 10.9 mi away | 126 PADDOCK STREET, CRYSTAL LAKE, IL, 60014 |
(815) 459-1687
|
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 MARENGO, IL US, located 4.6 miles from Seneca township. Local microclimates, topography, and elevation may cause municipal conditions to differ.
| Month | High (°F) | Low (°F) | Mean (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|---|
| January | 29.2° | 12.7° | 20.9° | 1.67" | 8.0" |
| February | 33.2° | 15.8° | 24.5° | 1.64" | 9.1" |
| March | 44.9° | 25.9° | 35.4° | 2.08" | 2.4" |
| April | 58.6° | 36.2° | 47.4° | 3.81" | 0.4" |
| May | 70.2° | 47.2° | 58.7° | 4.57" | 0.0" |
| June | 79.9° | 57.2° | 68.6° | 4.62" | 0.0" |
| July | 83.5° | 61.7° | 72.6° | 4.05" | 0.0" |
| August | 81.8° | 59.6° | 70.7° | 4.22" | 0.0" |
| September | 75.4° | 51.8° | 63.6° | 3.68" | 0.0" |
| October | 62.4° | 39.9° | 51.2° | 2.98" | 0.0" |
| November | 46.9° | 29.1° | 38.0° | 2.35" | 1.6" |
| December | 34.5° | 18.5° | 26.5° | 1.94" | 9.3" |
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 |
|---|---|---|---|
| Franklinville CDP | CDP | 1.2 mi | — |
| Union village | Village | 4.2 mi | — |
| Marengo city | City | 4.8 mi | — |
| Woodstock city | City | 4.8 mi | — |
| Hartland CDP | CDP | 5.1 mi | — |
| Coral CDP | CDP | 5.5 mi | — |
Sources & Data Provenance
- Geographic Classification & Identifiers: U.S. Census Bureau Gazetteer (2026) and TIGER/Line Shapefiles. GEOID: 1711168653. • 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.