Seneca, Grundy County, Illinois
Village in Grundy County, Illinois · ZIP 60450, 61360
- Grundy County
- Census data · ACS 2019-2023
- 3 public schools
- 2,310 (2024 estimate)Population
- 927Households
- $91,065Median household income
- $206,400Median home value
- 3Public schools
- 2ZIP codes
About Seneca
This page shows only what has been published about Seneca: Census facts with their sources first, then its businesses, jobs, events, people in public roles, housing and questions as they are added. Nothing here is written by the town government.
Town intelligenceOfficial sources, refreshed yearly
| Census | Population |
|---|---|
| 2000 | 2,053 |
| 2010 | 2,371 |
| 2020 | 2,353 |
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, place level, state 17, retrieved November 14, 2026; Census 2010 Summary File 1: total population, place level, state 17, retrieved November 14, 2026; Census 2020 Redistricting Data (P.L. 94-171): total population, place level, state 17, retrieved November 14, 2026.
Median household income $91,065 · 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, place level, state 17, retrieved November 14, 2026.
- Owner occupied
- 710 units
- Renter occupied
- 217 units
- Vacancy rate
- 4.5%
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, place level, state 17, retrieved November 14, 2026.
| Measure | Seneca | Grundy County | Illinois |
|---|---|---|---|
| Population | 2,525 | 52,920 | 12,692,653 |
| Median household income | $91,065 | $93,060 | $81,702 |
| Median age | 35.2 | 38.6 | 38.9 |
| Median home value | $206,400 | $259,200 | $250,500 |
| Bachelor’s degree or higher | 12.9% | 24.2% | 37.2% |
| Foreign-born residents | 1.9% | 3.5% | 14.4% |
| Owner-occupied homes | 76.6% | 75.8% | 66.8% |
| Mean commute to work | 29.9 minutes | 27.6 minutes | 28.1 minutes |
Source: American Community Survey 5-year data profile 2019–2023, place level, state 17, retrieved November 14, 2026.
CommunityRules and moderation
Events in SenecaAll events
No upcoming event is listed in Seneca yet. Members and businesses add events from the Events page; each is screened before it shows.
Schools
| School | Type | Grades | District |
|---|---|---|---|
| Seneca Grade School North Campus | Public | Pre-K–4 | Seneca CCSD 170 |
| Seneca Elem School South Campus | Public | 5–8 | Seneca CCSD 170 |
| Seneca High School | Public | 9–12 | Seneca Twp HSD 160 |
Open public schools in the NCES directory for 2023–2024, placed by their listed location; private schools are not in the source. Enrollment and ratings are not shown.
Sources: NCES Common Core of Data, public school directory 2023–2024, retrieved November 14, 2026; NCES EDGE public school geocodes 2024–2025, retrieved November 14, 2026.
Frequently asked about SenecaPromoted from questions people asked
No question about Seneca has been asked often enough to publish an answer yet. Ask Seneca and the answer, once a person checks it, appears here.
Nearby towns
- Manlius TownshipTownship
- MarseillesCity
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- Norman TownshipTownship
- Erienna TownshipTownship
- Vienna TownshipTownship
- Miller TownshipTownship
- KinsmanVillage
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Other towns in Grundy County
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- Braceville TownshipTownship
- Carbon HillVillage
- Coal CityVillage
- DiamondVillage
- East BrooklynVillage
- Erienna TownshipTownship
- Felix TownshipTownship
- GardnerVillage
- Garfield TownshipTownship
Other places named Seneca in Illinois
- Seneca TownshipTownship