Enrollment
378
Illinois · 2024-25 NCES data
High school (grades 9-12) · Seneca, IL
Seneca High School
Federal NCES profile for Seneca High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 40/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 173585003728
👥 S:T ratio 60
📚 AP courses 15
🌟 Gifted program 30
🎓 Counselors 62
📋 Attendance 31
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Seneca High School earns 40/100 on the Resource Investment Index, with class sizes smaller than 91% of Illinois schools.
- #1 of 3
- public schools in Seneca · Resource Index
- 40
- Resource Index · Typical
- 9.9:1
- small classes for Illinois
- 378
- students enrolled
Seneca High School has class sizes smaller than 91% of Illinois schools. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Seneca High School ranks #1 of 3 public schools in Seneca, IL.
School address
District: Seneca Twp Hsd 160 · Illinois
NCES ID 173585003728 Verify on NCES CCD record →
Teachers (FTE)
38.0
Federal CCD staff survey
Students per teacher
9.9:1
vs 14:1 Illinois avg
-29% vs state
Student-teacher ratio in context
How Seneca High School compares with Illinois and U.S. medians
What stands out at Seneca High School
Seneca High School is a mid-sized high school in Seneca, Illinois, enrolling 378 students.
Classes run notably small here: at 9.9:1, Seneca High School is leaner than roughly 91% of Illinois schools and 29% under the state's 14:1 norm, more adult attention per pupil than most peers.
With 378 students, its enrollment sits close to the Illinois median campus size.
Its Resource Investment Index lands in the upper third of 3,845 scored Illinois schools.
Its student body is predominantly White (85% of enrollment) (diversity index 27/100).
On the academic-pipeline side it reports 3 Advanced Placement courses.
Counselor coverage is strong, about 189 students per counselor, inside the American School Counselor Association's recommended 250:1.
Chronic absenteeism is elevated: 27.8% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding Seneca Twp Hsd 160 spends $35,140 per pupil, 106% above the Illinois average, a better-resourced district than most.
Seneca Twp Hsd 160 operates only this one school, so Seneca High School has no district-mates to compare against locally.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Seneca High School compares
Seneca High School on the metrics families compare, against Illinois and U.S. means.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 9.9:1 | ▼ 29% | 14:1 | 15.7:1 |
| Enrollment | 378 | top 49% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
9.9:1
Leaner classes than 89% of US schools, among the more generously staffed nationally.
378
Bigger than 44% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Staffing depth
9.9:1
students per teacher
- 29% below state mean
Top 9% in Illinois - lower ratio than 91% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
27.8%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$35,140
per pupil, district-wide
- above Illinois avg of $17,042
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors2.0 FTE
Per 189 students, the combined health-and-guidance staffing load for this school.
Discipline context
9
in-school suspensions + 7 out-of-school
Suspension rate: 2.4 per 100 students. Combined in-school and out-of-school rate: 4.2 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
White 84.7%
Hispanic or Latino 12.4%
Two or More 2.6%
Asian 0.3%
Largest group: White at 84.7% of enrollment.
Student-body diversity index 26.7/100
Simpson diversity index - at 26.7, Seneca High School is less mixed than the Illinois school average of 38.9.
Programs
AP courses offered 3
Funding & spending
District-wide per-pupil expenditure for Seneca Twp Hsd 160, which includes Seneca High School.
$35,140
Per student
+106%
vs Illinois
Avg $17,042
+112%
vs U.S.
Avg $16,593
Revenue mix
Local 79.2%
State 17.6%
Federal 3.2%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of Illinois, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~378 students)
Next steps
Verify locally before acting on Seneca High School's federal record.
- Compare Seneca High School against another school. Compare schools
- Seneca Twp Hsd 160's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Seneca High School
How many students attend Seneca High School?
Seneca High School has 378 students enrolled. It is a high school in Seneca, IL.
What is the student-teacher ratio at Seneca High School?
The student-teacher ratio at Seneca High School is 9.9:1, which is 29% lower than the Illinois average of 14:1 and 37% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What is the racial and ethnic makeup of Seneca High School?
The largest demographic group at Seneca High School is White at 84.7% of enrollment, in Seneca, IL.
What is the Resource Investment Index for Seneca High School?
Seneca High School has a Resource Investment Index of 40/100 (typical reported resources relative to schools nationally) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Seneca High School rank among public schools in Seneca?
By Resource Investment Index, Seneca High School ranks #1 of 3 public schools in Seneca, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Seneca on the city page.
Is Seneca High School a good school?
Seneca High School earns 40/100 on the Resource Investment Index, with class sizes smaller than 91% of Illinois schools. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Seneca Twp Hsd 160?
None reported; Seneca Twp Hsd 160 operates only Seneca High School as a public school district in NCES's records.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.