Enrollment
2,615
New York · 2024-25 NCES data
High school (grades 9-12) · Central Islip, NY
Central Islip Senior High School
Federal NCES profile for Central Islip Senior High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 43/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 360687000473
👥 S:T ratio 29
📚 AP courses 50
🌟 Gifted program 30
🎓 Counselors 13
📋 Attendance 93
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Central Islip Senior High School earns 43/100 on the Resource Investment Index, with class sizes larger than 96% of New York schools. It is also one of the largest schools in New York.
- #1 of 7
- public schools in Central Islip · Resource Index
- 43
- Resource Index · Typical
- 17.8:1
- large classes for New York
- 72.6%
- free-lunch eligible
Central Islip Senior High School has class sizes larger than 96% of New York schools. Computed live against every New York school reporting to NCES.
By Resource Investment Index, Central Islip Senior High School ranks #1 of 7 public schools in Central Islip, NY.
School address
District: Central Islip Union Free School District · New York
NCES ID 360687000473 Verify on NCES CCD record →
Teachers (FTE)
147.0
Federal CCD staff survey
Students per teacher
17.8:1
vs 11.8:1 New York avg
+51% vs state
Free-lunch eligible
72.6%
vs 56.2% New York avg
+29% vs state
Student-teacher ratio in context
How Central Islip Senior High School compares with New York and U.S. medians
What stands out at Central Islip Senior High School
Central Islip Senior High School is a higher-need, large high school in Central Islip, New York, enrolling 2,615 students.
Class loads run heavy: 17.8:1 is larger than about 96% of New York schools and 51% above the 11.8:1 state mean, so each teacher carries more students than is typical.
Economic need runs somewhat above the state's typical profile, with 72.6% of students eligible for free meals.
By headcount it is one of the larger campuses in New York, bigger than 99% of state schools at 2,615 students.
Its Resource Investment Index sits near the middle of the pack among 4,801 scored New York schools.
Against 43 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #15.
Its student body is predominantly Hispanic or Latino (81% of enrollment) (diversity index 32/100).
On the academic-pipeline side it reports 10 Advanced Placement courses.
Counselor access is stretched at roughly 436 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance holds up well here: only 2.8% of students were chronically absent, below the typical post-pandemic national figure.
Central Islip Union Free School District also operates Ralph Reed School (1,192 students) and Charles a Mulligan Elementary School (997 students) alongside Central Islip Senior High 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 Central Islip Senior High School compares
Central Islip Senior High School on the metrics families compare, against New York and U.S. means.
| Metric | This school | vs New York | New York avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 17.8:1 | ▲ 51% | 11.8:1 | 15.7:1 |
| Free-lunch eligible | 72.6% | ▲ 29% | 56.2% | 51.7% |
| Enrollment | 2,615 | top 1% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
17.8:1
Leaner classes than 26% of US schools, heavier class loads than most.
2,615
Bigger than 99% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
72.6%
free-lunch eligible
- 29% above the New York average of 56.2%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
17.8:1
students per teacher
- 51% above state mean
Top 96% in New York - lower ratio than 4% of state schools
Between 16:1 and 20:1, squarely in the typical U.S. public-school staffing range.
Engagement
2.8%
chronically absent (missed 10%+ of school days)
Below 5%, comfortably under the pre-pandemic national baseline for chronic absenteeism.
Funding equity
$28,339
per pupil, district-wide
- above New York avg of $26,410
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors6.0 FTE
Per 436 students, the combined health-and-guidance staffing load for this school.
Discipline context
284
in-school suspensions + 178 out-of-school
Suspension rate: 10.9 per 100 students. Combined in-school and out-of-school rate: 17.7 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
Hispanic or Latino 81.2%
African American 14.7%
White 1.6%
Asian 1.4%
Two or More 0.8%
American Indian / Alaska Native 0.2%
Native Hawaiian / Pacific Islander 0.1%
Largest group: Hispanic or Latino at 81.2% of enrollment.
Student-body diversity index 31.9/100
Simpson diversity index - at 31.9, Central Islip Senior High School is less mixed than the New York school average of 45.5.
Programs
AP courses offered 10
Funding & spending
District-wide per-pupil expenditure for Central Islip Union Free School District, which includes Central Islip Senior High School.
$28,339
Per student
+7%
vs New York
Avg $26,410
+71%
vs U.S.
Avg $16,593
Revenue mix
Local 37.5%
State 53.6%
Federal 8.9%
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 Central Islip Senior High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Ralph Reed School | Smaller | Similar economic need | Lower S:T ratio |
| Charles a Mulligan Elementary School | Smaller | Similar economic need | Lower S:T ratio |
| Andrew T Morrow School | Smaller | Similar economic need | Lower S:T ratio |
| Francis J O'neill School | Smaller | Similar economic need | Lower S:T ratio |
| Marguerite L Mulvey School | Smaller | Similar economic need | Lower S:T ratio |
Comparisons are relative to Central Islip Senior High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,192
- Students per teacher
- 14.5:1
- Resource Index
- 23/100
- Enrollment
- 997
- Students per teacher
- 15.3:1
- Resource Index
- 23/100
- Enrollment
- 821
- Students per teacher
- 13.9:1
- Resource Index
- 25/100
- Enrollment
- 600
- Students per teacher
- 14.3:1
- Resource Index
- 25/100
- Enrollment
- 567
- Students per teacher
- 14.5:1
- Resource Index
- 24/100
Similar high schools statewide
Matched by enrollment size and by staffing ratio across all of New York, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~2,615 students)
Next steps
Verify locally before acting on Central Islip Senior High School's federal record.
- Compare Central Islip Senior High School against another school. Compare schools
- Central Islip Union Free School District'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 Central Islip Senior High School
How many students attend Central Islip Senior High School?
Central Islip Senior High School has 2,615 students enrolled. It is a high school in Central Islip, NY.
What is the student-teacher ratio at Central Islip Senior High School?
The student-teacher ratio at Central Islip Senior High School is 17.8:1, which is 51% higher than the New York average of 11.8:1 and 13% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Central Islip Senior High School?
72.6% of students at Central Islip Senior High School are eligible for free lunch, compared to the New York average of 56.2%.
What is the racial and ethnic makeup of Central Islip Senior High School?
The largest demographic group at Central Islip Senior High School is Hispanic or Latino at 81.2% of enrollment, in Central Islip, NY.
What is the Resource Investment Index for Central Islip Senior High School?
Central Islip Senior High School has a Resource Investment Index of 43/100 (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 Central Islip Senior High School rank among public schools in Central Islip?
By Resource Investment Index, Central Islip Senior High School ranks #1 of 7 public schools in Central Islip, NY. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Central Islip on the city page.
Is Central Islip Senior High School a good school?
Central Islip Senior High School earns 43/100 on the Resource Investment Index, with class sizes larger than 96% of New York schools. It is also one of the largest schools in New York. 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 Central Islip Union Free School District?
Besides Central Islip Senior High School, Central Islip Union Free School District also operates Ralph Reed School (1,192 students), Charles a Mulligan Elementary School (997 students), and Andrew T Morrow School (821 students). See the Central Islip Union Free School District district page for the complete list.
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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.