Enrollment
275
Connecticut · 2024-25 NCES data
Other / mixed grade configuration · Waterbury, CT
International School
Federal NCES profile for International School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 28/100.
2024-25 NCES dataOther / mixed grade configurationNCES 090483001950
👥 S:T ratio 0
🌟 Gifted program 30
🎓 Counselors 0
📋 Attendance 82
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
International School earns 28/100 on the Resource Investment Index, with class sizes larger than 98% of Connecticut schools. It is also less racially and ethnically mixed than most Connecticut schools.
- #10 of 21
- schools in Waterbury · Resource Index
- 28
- Resource Index · Lower
- 25:1
- large classes for Connecticut
- 62.6%
- free-lunch eligible
International School has class sizes larger than 98% of Connecticut schools. Computed live against every Connecticut school reporting to NCES.
By Resource Investment Index, International School ranks #10 of 21 schools in Waterbury, CT.
School address
District: Waterbury School District · Connecticut
NCES ID 090483001950 Verify on NCES CCD record →
Teachers (FTE)
11.0
Federal CCD staff survey
Students per teacher
25:1
vs 12.1:1 Connecticut avg
+107% vs state
Free-lunch eligible
62.6%
vs 36.4% Connecticut avg
+72% vs state
Student-teacher ratio in context
How International School compares with Connecticut and U.S. medians
What stands out at International School
International School is a higher-need, mid-sized combined-grade school in Waterbury, Connecticut, enrolling 275 students.
Class loads run heavy: 25:1 is larger than about 98% of Connecticut schools and 107% above the 12.1:1 state mean, so each teacher carries more students than is typical.
Economic need runs somewhat above the state's typical profile, with 62.6% of students eligible for free meals.
Enrollment of 275 puts it in the smaller third of Connecticut schools by headcount.
Its Resource Investment Index trails 94% of the 1,003 Connecticut schools with a score on record, one of the lower results on this measure.
Among 82 similarly sized, similarly resourced-need Connecticut schools statewide, it ranks #77, in the lower tier once campus size and economic need are matched.
Its student body is predominantly Hispanic or Latino (87% of enrollment), among the less diverse in the state (diversity index 23/100).
Counselor access is stretched at roughly 1100 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance holds up well here: only 7.3% of students were chronically absent, below the typical post-pandemic national figure.
The surrounding Waterbury School District spends $18,981 per pupil, 20% below the Connecticut average, a leaner-resourced district than most.
Among Waterbury's public schools, it stands alongside Waterbury Arts Magnet School (820 students): International School is smaller than that campus by headcount and runs heavier classes (25:1 vs 16.7:1).
Waterbury School District also operates Crosby High School (1,453 students) and John F. Kennedy High School (1,391 students) alongside International 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 International School compares
International School on the metrics families compare, against Connecticut and U.S. means.
| Metric | This school | vs Connecticut | Connecticut avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 25:1 | ▲ 107% | 12.1:1 | 15.7:1 |
| Free-lunch eligible | 62.6% | ▲ 72% | 36.4% | 51.7% |
| Enrollment | 275 | top 81% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
25:1
Leaner classes than 5% of US schools, heavier class loads than most.
275
Bigger than 29% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
62.6%
free-lunch eligible
- 72% above the Connecticut average of 36.4%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
25:1
students per teacher
- 107% above state mean
Top 98% in Connecticut - lower ratio than 2% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
7.3%
chronically absent (missed 10%+ of school days)
In the 5-10% range, close to the pre-pandemic national baseline.
Funding equity
$18,981
per pupil, district-wide
- below Connecticut avg of $23,870
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors0.3 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
0
in-school suspensions + 0 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.0 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 87.3%
African American 8.0%
Two or More 2.9%
White 1.8%
Largest group: Hispanic or Latino at 87.3% of enrollment.
Student-body diversity index 23.0/100
Simpson diversity index - at 23.0, International School is less mixed than the Connecticut school average of 50.5.
Programs
Funding & spending
District-wide per-pupil expenditure for Waterbury School District, which includes International School.
$18,981
Per student
-20%
vs Connecticut
Avg $23,870
+14%
vs U.S.
Avg $16,593
Revenue mix
Local 23.5%
State 63.9%
Federal 12.6%
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 International School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Crosby High School | Larger | Higher economic need | Lower S:T ratio |
| John F. Kennedy High School | Larger | Higher economic need | Lower S:T ratio |
| Wilby High School | Larger | Higher economic need | Lower S:T ratio |
| Michael F. Wallace Middle School | Larger | Higher economic need | Lower S:T ratio |
| West Side Middle School | Larger | Higher economic need | Lower S:T ratio |
Comparisons are relative to International School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,453
- Students per teacher
- 16.5:1
- Resource Index
- 26/100
- Enrollment
- 1,391
- Students per teacher
- 15.5:1
- Resource Index
- 35/100
- Enrollment
- 1,196
- Students per teacher
- 15.1:1
- Resource Index
- 30/100
- Enrollment
- 1,059
- Students per teacher
- 11.5:1
- Resource Index
- 38/100
- Enrollment
- 848
- Students per teacher
- 10.2:1
- Resource Index
- 37/100
Similar other schools in Waterbury
6 comparable other schools (grades Mixed) serving the same city.
Waterbury Arts Magnet School
Standard public school
820 students 16.7:1 students per teacher
Rotella Interdistrict Magnet School
Standard public school
614 students 17.1:1 students per teacher
Wendell L. Cross School
Standard public school
606 students 16.4:1 students per teacher
Maloney Interdistrict Magnet School
Standard public school
590 students 14:1 students per teacher
B. W. Tinker School
Standard public school
578 students 18.6:1 students per teacher
H. S. Chase School
Standard public school
543 students 10.6:1 students per teacher
Similar other schools statewide
Matched by enrollment size and by staffing ratio across all of Connecticut, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~275 students)
Next steps
Verify locally before acting on International School's federal record.
- Compare International School against another school. Compare schools
- Waterbury 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 International School
How many students attend International School?
International School has 275 students enrolled. It is a public school in Waterbury, CT.
What is the student-teacher ratio at International School?
The student-teacher ratio at International School is 25:1, which is 107% higher than the Connecticut average of 12.1:1 and 59% higher than the national average of 15.7:1.
What percentage of students receive free lunch at International School?
62.6% of students at International School are eligible for free lunch, compared to the Connecticut average of 36.4%.
What is the racial and ethnic makeup of International School?
The largest demographic group at International School is Hispanic or Latino at 87.3% of enrollment, in Waterbury, CT.
What is the Resource Investment Index for International School?
International School has a Resource Investment Index of 28/100 (lower 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 International School rank among schools in Waterbury?
By Resource Investment Index, International School ranks #10 of 21 schools in Waterbury, CT. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all schools in Waterbury on the city page.
Is International School a good school?
International School earns 28/100 on the Resource Investment Index, with class sizes larger than 98% of Connecticut schools. It is also less racially and ethnically mixed than most Connecticut 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 Waterbury School District?
Besides International School, Waterbury School District also operates Crosby High School (1,453 students), John F. Kennedy High School (1,391 students), and Wilby High School (1,196 students). See the Waterbury School District 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.