Enrollment
264
Illinois · 2024-25 NCES data
Elementary school (grades K-5) · Mason City, IL
Illini Central Grade School
Federal NCES profile for Illini Central Grade School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 41/100.
2024-25 NCES dataElementary school (grades K-5)NCES 170011305388
👥 S:T ratio 61
🌟 Gifted program 30
🎓 Counselors 47
📋 Attendance 27
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Illini Central Grade School earns 41/100 on the Resource Investment Index, with class sizes smaller than 91% of Illinois schools. It is also less racially and ethnically mixed than most Illinois schools.
- #4 of 4
- public schools in Mason City · Resource Index
- 41
- Resource Index · Typical
- 9.8:1
- small classes for Illinois
- 264
- students enrolled
Illini Central Grade School has class sizes smaller than 91% of Illinois schools. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Illini Central Grade School ranks #4 of 4 public schools in Mason City, IL.
School address
District: Illini Central Cusd 189 · Illinois
NCES ID 170011305388 Verify on NCES CCD record →
Teachers (FTE)
27.0
Federal CCD staff survey
Students per teacher
9.8:1
vs 14:1 Illinois avg
-30% vs state
Student-teacher ratio in context
How Illini Central Grade School compares with Illinois and U.S. medians
What stands out at Illini Central Grade School
Illini Central Grade School is a mid-sized elementary school in Mason City, Illinois, enrolling 264 students.
Classes run notably small here: at 9.8:1, Illini Central Grade School is leaner than roughly 91% of Illinois schools and 30% under the state's 14:1 norm, more adult attention per pupil than most peers.
Enrollment of 264 puts it in the smaller third of Illinois schools by headcount.
Its Resource Investment Index sits near the middle of the pack among 3,845 scored Illinois schools.
Its student body is predominantly White (93% of enrollment), among the less diverse in the state (diversity index 13/100).
Counselor coverage runs a bit thin, about 264 students per counselor, somewhat past the ASCA-recommended 250:1 benchmark.
Chronic absenteeism is elevated: 29.2% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Illini Central Cusd 189 also operates Illini Central High School (172 students) and Illini Central Middle School (139 students) alongside Illini Central Grade School.
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 Illini Central Grade School compares
Illini Central Grade 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 | 9.8:1 | ▼ 30% | 14:1 | 15.7:1 |
| Enrollment | 264 | top 71% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
9.8:1
Leaner classes than 90% of US schools, among the more generously staffed nationally.
264
Bigger than 27% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Staffing depth
9.8:1
students per teacher
- 30% 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
29.2%
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
$15,441
per pupil, district-wide
- below Illinois avg of $17,042
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors1.0 FTE
Per 264 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 6 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 2.3 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 93.2%
Hispanic or Latino 3.4%
Two or More 3.0%
Asian 0.4%
Largest group: White at 93.2% of enrollment.
Student-body diversity index 12.9/100
Simpson diversity index - at 12.9, Illini Central Grade School is less mixed than the Illinois school average of 38.9.
Programs
Funding & spending
District-wide per-pupil expenditure for Illini Central Cusd 189, which includes Illini Central Grade School.
$15,441
Per student
-9%
vs Illinois
Avg $17,042
-7%
vs U.S.
Avg $16,593
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.
How Illini Central Grade School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Illini Central High School | Smaller | No free-lunch data | Similar S:T ratio |
| Illini Central Middle School | Smaller | 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 Grade School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 172
- Students per teacher
- 9.1:1
- Resource Index
- 42/100
- Enrollment
- 139
- Students per teacher
- 11.6:1
- Resource Index
- 43/100
- Enrollment
- 65
- Students per teacher
- 21.7:1
- Resource Index
- 43/100
Similar elementary 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 (~264 students)
Similar student-teacher ratio (~9.8:1)
Next steps
Verify locally before acting on Illini Central Grade School's federal record.
- Compare Illini Central Grade School against another school. Compare schools
- Illini Central Cusd 189'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 Illini Central Grade School
How many students attend Illini Central Grade School?
Illini Central Grade School has 264 students enrolled. It is an elementary school in Mason City, IL.
What is the student-teacher ratio at Illini Central Grade School?
The student-teacher ratio at Illini Central Grade School is 9.8:1, which is 30% lower than the Illinois average of 14:1 and 38% 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 Grade School?
The largest demographic group at Illini Central Grade School is White at 93.2% of enrollment, in Mason City, IL.
What is the Resource Investment Index for Illini Central Grade School?
Illini Central Grade School has a Resource Investment Index of 41/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Illini Central Grade School rank among public schools in Mason City?
By Resource Investment Index, Illini Central Grade School ranks #4 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. See all public schools in Mason City on the city page.
Is Illini Central Grade School a good school?
Illini Central Grade School earns 41/100 on the Resource Investment Index, with class sizes smaller than 91% of Illinois schools. It is also less racially and ethnically mixed than most 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 Illini Central Cusd 189?
Besides Illini Central Grade School, Illini Central Cusd 189 also operates Illini Central High School (172 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.
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.