Enrollment
172
Illinois · 2024-25 NCES data
2024-25 NCES data High school (grades 9-12) NCES 170011305387
Illini Central High School — Mason City, IL
Federal NCES profile for Illini Central High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators — Resource Investment Index 34/100.
👥 Class size 61
📚 AP courses 5
🌟 Gifted program 30
🎓 Counselors 66
📋 Attendance 8
How this works: Each indicator above is scored 0–100 from federal NCES and CRDC data, then averaged into the Resource Investment Index. This measures resource allocation — staffing, programs, and support services — not standardized test scores or academic outcomes. Full methodology →
School address
District: Illini Central Cusd 189 · Illinois
Public location data per NCES (National Center for Education Statistics) Common Core of Data. Verify the school's current address on the NCES CCD record.
Teachers (FTE)
19.0
Federal CCD staff survey
Students per teacher
9.7:1
vs 14.6:1 Illinois avg
-34% vs state
Student-teacher ratio in context
How Illini Central High School compares with Illinois and U.S. medians
The federal record — no proprietary index, no editorial formula.
PlainSchools publishes the actual federal measurements — enrollment, staffing, demographics, discipline, and finance — straight from the NCES Common Core of Data, CRDC, and F-33 surveys. No composite rating, no opinion-based score on top. You get the same raw numbers researchers and policymakers use, with benchmarks, spending context, and equity indicators computed from the same federal datasets. Full methodology linked below.
What this school's NCES data tells you
Illini Central High School reports 172 enrolled students to the National Center for Education Statistics (NCES) alongside 19.0 full-time-equivalent teachers, producing a 9.7:1 student-teacher ratio. That figure sits 34% below the Illinois state mean of 14.6:1, signalling more teacher attention per pupil than the state benchmark. Against the national 2024-25 average of 15.9:1, it is 39% lower, a useful calibration for families comparing districts across state lines.
The school offers 1 Advanced Placement course, a stronger academic pipeline indicator than enrollment alone. Counselor coverage works out to roughly 172 students per counselor, meeting the American School Counselor Association recommendation of 250:1. Chronic absenteeism — missing 10% or more of school days — stands at 36.6% according to the 2021-22 Civil Rights Data Collection.
On the finance side, the surrounding Illini Central Cusd 189 spends $18,654 per pupil district-wide, below the Illinois average of $20,099 and below the national average of $19,490. Revenue comes 52.4% from local sources (property taxes), 36.2% from the state, and 11.5% from federal programs per the NCES F-33 finance survey. Taken together, these measurements produce a Resource Investment Index of 34/100 (F), calculated from 5 distinct NCES and CRDC indicators measuring resource allocation rather than academic outcomes.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Illini Central High School compares
Cross-validating school-level NCES values against Illinois state and U.S. national means lets readers see whether this school is an outlier or in line with peers.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 9.7:1 | ▼ 34% | 14.6:1 | 15.9:1 |
| Enrollment | 172 | top 14% | — | — |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
What the federal data reveals about equity at this school
Federal measurements — not ratings — surface the resource and opportunity picture. Below are the indicators that researchers, civil-rights monitors, and funding formulas use to assess equity.
Staffing depth
9.7:1
students per teacher
— 34% below state mean
Top 7% in Illinois — lower ratio than 93% of state schools
Below the 15:1 benchmark — typical of schools with smaller class sizes and more individualized attention.
Engagement
36.6%
chronically absent (missed 10%+ of school days)
Chronic absenteeism at or above 20% — the CDC threshold for "high" — signals significant barriers to regular attendance.
Funding equity
$18,654
per pupil, district-wide
— below Illinois avg of $20,099
Below the U.S. average per-pupil spend — funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors1.0 FTE
Per 172 students — the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 25 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 14.5 per 100 students. Reported via the Civil Rights Data Collection.
Overview
Enrollment 172 Top 14% in Illinois — larger than 86% of 3,845 state schools
Teachers (FTE) 19.0
Students per teacher 9.7:1 -34% vs state
Free-lunch eligible —
NCES ID 170011305387
Student demographics
White 95.9%
Two or More 2.3%
Hispanic or Latino 1.7%
Largest group: White at 95.9% of enrollment.
Programs & staff
AP courses offered 1
Counselors (FTE) 1.0
Students per counselor 172:1
Discipline & special education
Chronically absent 36.6%
In-school suspensions 0
Out-of-school suspensions 25
Funding & spending
District-wide per-pupil expenditure for Illini Central Cusd 189, which includes Illini Central High School.
$18,654
Per student
-7%
vs Illinois
Avg $20,099
-4%
vs U.S.
Avg $19,490
Revenue mix
Local 52.4%
State 36.2%
Federal 11.5%
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.
Other Schools in This District
- Enrollment
- 264
- Students per teacher
- 9.3:1
- Enrollment
- 139
- Students per teacher
- 11.8:1
- Enrollment
- 65
- Students per teacher
- 23.3:1
Educator & family resources
In-depth guides on understanding NCES data, school choice, and education funding.
Understanding NCES data
How CCD, CRDC and EDFacts feed every public-school number you see.
Choose a school district
Eight signals that matter more than the overall ranking number.
How schools are funded
Title I, F-33, state aid formulas and what per-pupil spending really means.
Chronic absenteeism
Why missing 10% of school matters and how it varies by district.
Magnet vs charter vs traditional
Three school types, three funding models, three sets of trade-offs.
School discipline data
What CRDC suspension and expulsion records do and don't reveal.
Frequently asked questions about Illini Central High School
How many students attend Illini Central High School?
Illini Central High School has 172 students enrolled. It is a high school in Mason City, IL.
What is the student-teacher ratio at Illini Central High School?
The student-teacher ratio at Illini Central High School is 9.7:1, which is 34% lower than the Illinois average of 14.6:1 and 39% lower than the national average of 15.9:1. Lower ratios generally mean more individual attention per student.
What is the racial and ethnic makeup of Illini Central High School?
The largest demographic group at Illini Central High School is White at 95.9%. The school serves a student body in Mason City, IL.
What is the Resource Investment Index for Illini Central High School?
Illini Central High School has a Resource Investment Index of 34/100 (F) based on 5 factors: student-teacher ratio, AP course offerings, counselor availability, attendance rates. This index measures federal resource allocation — staffing levels, program availability, and support services — not standardized test scores or academic outcomes.