Enrollment
540
Illinois · 2024-25 NCES data
Elementary school (grades K-5) · East Saint Louis, IL
Mason/Clark Middle Sch
Federal NCES profile for Mason/Clark Middle Sch, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 41/100.
2024-25 NCES dataElementary school (grades K-5)NCES 171332004977
👥 S:T ratio 61
🌟 Gifted program 30
🎓 Counselors 73
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mason/Clark Middle Sch 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.
- #2 of 4
- elementary schools in East Saint Louis · Resource Index
- 41
- Resource Index · Typical
- 9.8:1
- small classes for Illinois
- 540
- students enrolled
Mason/Clark Middle Sch has class sizes smaller than 91% of Illinois schools. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Mason/Clark Middle Sch ranks #2 of 4 elementary schools in East Saint Louis, IL.
School address
District: East St Louis Sd 189 · Illinois
NCES ID 171332004977 Verify on NCES CCD record →
Teachers (FTE)
55.0
Federal CCD staff survey
Students per teacher
9.8:1
vs 14:1 Illinois avg
-30% vs state
Student-teacher ratio in context
How Mason/Clark Middle Sch compares with Illinois and U.S. medians
What stands out at Mason/Clark Middle Sch
Mason/Clark Middle Sch is a mid-sized elementary school in East Saint Louis, Illinois, enrolling 540 students.
Classes run notably small here: at 9.8:1, Mason/Clark Middle Sch 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 540 puts it in the larger 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 African American (95% of enrollment), among the less diverse in the state (diversity index 10/100).
Counselor coverage is strong, about 135 students per counselor, inside the American School Counselor Association's recommended 250:1.
Chronic absenteeism is elevated: 92.8% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding East St Louis Sd 189 spends $25,739 per pupil, 51% above the Illinois average, a better-resourced district than most.
Its district draws 22.2% of revenue from federal sources, an above-typical federal share that tends to track a higher-need student population.
Among East Saint Louis's elementary schools, it stands alongside Annette Officer Elementary (362 students): Mason/Clark Middle Sch is larger than that campus by headcount and runs leaner classes (9.8:1 vs 12.5:1).
East St Louis Sd 189 also operates East St Louis Senior High School (1,288 students) and Wyvetter Younge Sch of Excellence (534 students) alongside Mason/Clark Middle Sch.
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 Mason/Clark Middle Sch compares
Mason/Clark Middle Sch 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 | 540 | top 26% | - | - |
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.
540
Bigger than 66% 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
92.8%
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
$25,739
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
Counselors4.0 FTE
Per 135 students, the combined health-and-guidance staffing load for this school.
Discipline context
19
in-school suspensions + 0 out-of-school
Suspension rate: 3.5 per 100 students. Combined in-school and out-of-school rate: 3.5 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
African American 94.6%
Hispanic or Latino 2.6%
Two or More 1.5%
White 0.7%
Native Hawaiian / Pacific Islander 0.4%
Asian 0.2%
Largest group: African American at 94.6% of enrollment.
Student-body diversity index 10.4/100
Simpson diversity index - at 10.4, Mason/Clark Middle Sch is less mixed than the Illinois school average of 38.9.
Programs
Funding & spending
District-wide per-pupil expenditure for East St Louis Sd 189, which includes Mason/Clark Middle Sch.
$25,739
Per student
+51%
vs Illinois
Avg $17,042
+55%
vs U.S.
Avg $16,593
Revenue mix
Local 15.7%
State 62.1%
Federal 22.2%
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.
How Mason/Clark Middle Sch Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| East St Louis Senior High School | Larger | No free-lunch data | Higher S:T ratio |
| Wyvetter Younge Sch of Excellence | Similar size | No free-lunch data | Higher S:T ratio |
| Katie Harper-Wright Elem | Similar size | No free-lunch data | Higher S:T ratio |
| Vivian Adams Early Child Ctr | Smaller | No free-lunch data | Higher S:T ratio |
| Annette Officer Elementary | Smaller | No free-lunch data | Higher S:T ratio |
Comparisons are relative to Mason/Clark Middle Sch's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,288
- Students per teacher
- 15.7:1
- Resource Index
- 39/100
- Enrollment
- 534
- Students per teacher
- 17.8:1
- Resource Index
- 29/100
- Enrollment
- 418
- Students per teacher
- 13.9:1
- Resource Index
- 25/100
- Enrollment
- 377
- Students per teacher
- 14:1
- Resource Index
- 58/100
- Enrollment
- 362
- Students per teacher
- 12.5:1
- Resource Index
- 27/100
Similar elementary schools in East Saint Louis
3 comparable elementary schools (grades K-5) serving the same city.
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 (~540 students)
Similar student-teacher ratio (~9.8:1)
Next steps
Verify locally before acting on Mason/Clark Middle Sch's federal record.
- Compare Mason/Clark Middle Sch against another school. Compare schools
- East St Louis Sd 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 Mason/Clark Middle Sch
How many students attend Mason/Clark Middle Sch?
Mason/Clark Middle Sch has 540 students enrolled. It is an elementary school in East Saint Louis, IL.
What is the student-teacher ratio at Mason/Clark Middle Sch?
The student-teacher ratio at Mason/Clark Middle Sch 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 Mason/Clark Middle Sch?
The largest demographic group at Mason/Clark Middle Sch is African American at 94.6% of enrollment, in East Saint Louis, IL.
What is the Resource Investment Index for Mason/Clark Middle Sch?
Mason/Clark Middle Sch 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 Mason/Clark Middle Sch rank among elementary schools in East Saint Louis?
By Resource Investment Index, Mason/Clark Middle Sch ranks #2 of 4 elementary schools in East Saint Louis, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in East Saint Louis on the city page.
Is Mason/Clark Middle Sch a good school?
Mason/Clark Middle Sch 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 East St Louis Sd 189?
Besides Mason/Clark Middle Sch, East St Louis Sd 189 also operates East St Louis Senior High School (1,288 students), Wyvetter Younge Sch of Excellence (534 students), and Katie Harper-Wright Elem (418 students). See the East St Louis Sd 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.