- Enrollment
- 264
- Students per teacher
- 9.8:1
- Resource Index
- 41/100
High school (grades 9-12) · Mason City, IL
Illini Central High School
Federal NCES profile for Illini Central High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 42/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 170011305387
👥 S:T ratio 64
🌟 Gifted program 30
🎓 Counselors 66
📋 Attendance 8
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Illini Central High School earns 42/100 on the Resource Investment Index, with class sizes smaller than 94% of Illinois schools. It is also less racially and ethnically mixed than most Illinois schools.
- #3 of 4
- public schools in Mason City · Resource Index
- 42
- Resource Index · Typical
- 9.1:1
- small classes for Illinois
- 172
- students enrolled
Illini Central High School has class sizes smaller than 94% of Illinois schools. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Illini Central High School ranks #3 of 4 public schools in Mason City, IL.
School address
District: Illini Central Cusd 189 · Illinois
NCES ID 170011305387 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
+5 students YoY
Illini Central High School held near 190 students from 2022-23 to 2023-24 (+5 headcount).
Teacher FTE held 19.9 → 20.1 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
+5 students YoY 170011305387 · Mason City, IL High · SMALL · TRAD
172 enr · 9.1:1 · RII 42
Nearest enrollment peer: Illini Central Grade School (264 students)
Illini Central High School held near 190 students from 2022-23 to 2023-24 (+5 headcount). Teacher FTE held 19.9 → 20.1 across the same CCD years. Read with this school → · District book → · Illinois schools → · Find another →
Illini Central High School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Illini Central
Illini Central Grade School
264 students
- This school
Illini Central High School
172 students
- Illini Central
Illini Central Middle School
139 students
- West Campus Fa 65
West Campus Facility
65 students
What this shows Illini Central High School reports 172 students on the CCD universe file.
How Illini Central High School compares
Illini Central High School held steady on CCD headcount: ratios and free-lunch share vs Illinois and U.S. means.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 9.1:1 | ▼ 35% | 14:1 | 15.7:1 |
| Enrollment | 172 | top 86% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
9.1:1
Leaner classes than 92% of US schools, among the more generously staffed nationally.
172
Bigger than 17% of US schools by enrollment, a small campus.
Equity indicators methodology
Staffing depth
9.1:1
students per teacher
- 35% below state mean
Top 6% in Illinois - lower ratio than 94% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
36.6%
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
$17,704
per pupil, district-wide
- below Illinois avg of $18,196
Close to the U.S. public-school average per-pupil spend.
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.
Student demographics
White 95.9%
Two or More 2.3%
Hispanic or Latino 1.7%
Largest group: White at 95.9% of enrollment.
Student-body diversity index 8.0/100
Simpson diversity index - at 8.0, Illini Central High School is less mixed than the Illinois school average of 38.9.
Programs
AP courses offered 1
District finance for Illini Central Cusd 189 reports $17,704 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Illini Central High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Illini Central Grade School | Larger | No free-lunch data | Similar S:T ratio |
| Illini Central Middle School | Similar size | No free-lunch data | Higher S:T ratio |
| West Campus Facility | Smaller | No free-lunch data | Higher S:T ratio |
Comparisons are relative to Illini Central High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 139
- Students per teacher
- 11.6:1
- Resource Index
- 43/100
- Enrollment
- 65
- Students per teacher
- 21.7:1
- Resource Index
- 43/100
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~172 students)
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. CCD year-over-year: 185 (2022-23) → 190 (2023-24), nearly flat (+5).
What is the student-teacher ratio at Illini Central High School?
The student-teacher ratio at Illini Central High School is 9.1:1, which is 35% lower than the Illinois average of 14:1 and 42% 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 Illini Central High School?
The largest demographic group at Illini Central High School is White at 95.9% of enrollment, 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 42/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Illini Central High School rank among public schools in Mason City?
By Resource Investment Index, Illini Central High School ranks #3 of 4 public schools in Mason City, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking.
What other schools are in Illini Central Cusd 189?
Besides Illini Central High School, Illini Central Cusd 189 also operates Illini Central Grade School (264 students), Illini Central Middle School (139 students), and West Campus Facility (65 students). See the Illini Central Cusd 189 district page for the complete list.