Enrollment
339
Connecticut · 2024-25 NCES data
Other / mixed grade configuration · Groton, CT
Charles Barnum Magnet School
Federal NCES profile for Charles Barnum Magnet School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 38/100.
2024-25 NCES dataOther / mixed grade configurationNCES 090177000313
👥 S:T ratio 52
🌟 Gifted program 30
📋 Attendance 33
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Charles Barnum Magnet School earns 38/100 on the Resource Investment Index, with class sizes near the Connecticut median.
- #6 of 7
- public schools in Groton · Resource Index
- 38
- Resource Index · Typical
- 12.1:1
- students per teacher
- 26.5%
- free-lunch eligible
Charles Barnum Magnet School has class sizes near the Connecticut median. Computed live against every Connecticut school reporting to NCES.
By Resource Investment Index, Charles Barnum Magnet School ranks #6 of 7 public schools in Groton, CT.
School address
District: Groton School District · Connecticut
NCES ID 090177000313 Verify on NCES CCD record →
Teachers (FTE)
28.0
Federal CCD staff survey
Students per teacher
12.1:1
vs 12.1:1 Connecticut avg
+0% vs state
Free-lunch eligible
26.5%
vs 36.4% Connecticut avg
-27% vs state
Student-teacher ratio in context
How Charles Barnum Magnet School compares with Connecticut and U.S. medians
What stands out at Charles Barnum Magnet School
Charles Barnum Magnet School is a mid-sized combined-grade school in Groton, Connecticut, enrolling 339 students.
At 12.1:1, its student-teacher ratio sits close to the Connecticut median, within a few percentage points of the 12.1:1 state norm, neither notably crowded nor notably small.
Its free-meal eligibility rate of 26.5% lands close to the Connecticut typical range, neither a high- nor low-need campus by this measure.
Enrollment of 339 puts it in the smaller third of Connecticut schools by headcount.
Its Resource Investment Index lands in the lower third of 1,003 scored Connecticut schools.
Among 269 similarly sized, similarly resourced-need Connecticut schools statewide, it ranks #250, in the lower tier once campus size and economic need are matched.
Its student body is led by White (51%) and Hispanic or Latino (27%) (diversity index 64/100).
Chronic absenteeism is elevated: 26.8% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Among Groton's public schools, it stands alongside Thames River Magnet School (501 students): Charles Barnum Magnet School is smaller than that campus by headcount and runs heavier classes (12.1:1 vs 11.7:1).
Groton School District also operates Robert E. Fitch High School (942 students) and Groton Middle School (884 students) alongside Charles Barnum Magnet 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 Charles Barnum Magnet School compares
Charles Barnum Magnet 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 | 12.1:1 | ▼ 0% | 12.1:1 | 15.7:1 |
| Free-lunch eligible | 26.5% | ▼ 27% | 36.4% | 51.7% |
| Enrollment | 339 | top 67% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
12.1:1
Leaner classes than 75% of US schools, among the more generously staffed nationally.
339
Bigger than 38% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
26.5%
free-lunch eligible
- 27% below the Connecticut average of 36.4%
Below the 40% Title I threshold; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
12.1:1
students per teacher
- 0% above state mean
Top 60% in Connecticut - lower ratio than 40% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
26.8%
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
$23,574
per pupil, district-wide
- below Connecticut avg of $23,870
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
2
in-school suspensions + 5 out-of-school
Suspension rate: 0.6 per 100 students. Combined in-school and out-of-school rate: 2.1 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 51.3%
Hispanic or Latino 27.4%
Two or More 11.5%
African American 7.1%
Asian 2.4%
Native Hawaiian / Pacific Islander 0.3%
Largest group: White at 51.3% of enrollment.
Student-body diversity index 64.3/100
Simpson diversity index - at 64.3, Charles Barnum Magnet School is more mixed than the Connecticut school average of 50.5.
Programs
Funding & spending
District-wide per-pupil expenditure for Groton School District, which includes Charles Barnum Magnet School.
$23,574
Per student
-1%
vs Connecticut
Avg $23,870
+42%
vs U.S.
Avg $16,593
Revenue mix
Local 48.5%
State 45.0%
Federal 6.5%
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 Charles Barnum Magnet School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Robert E. Fitch High School | Larger | Similar economic need | Lower S:T ratio |
| Groton Middle School | Larger | Higher economic need | Similar S:T ratio |
| Mystic River Magnet School | Larger | Similar economic need | Similar S:T ratio |
| Thames River Magnet School | Larger | Higher economic need | Similar S:T ratio |
| Northeast Academy Magnet School | Similar size | Similar economic need | Similar S:T ratio |
Comparisons are relative to Charles Barnum Magnet School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 942
- Students per teacher
- 9.9:1
- Resource Index
- 43/100
- Enrollment
- 884
- Students per teacher
- 11.5:1
- Resource Index
- 44/100
- Enrollment
- 520
- Students per teacher
- 12.7:1
- Resource Index
- 42/100
- Enrollment
- 501
- Students per teacher
- 11.7:1
- Resource Index
- 58/100
- Enrollment
- 392
- Students per teacher
- 12.6:1
- Resource Index
- 46/100
Similar other schools in Groton
1 comparable other schools (grades Mixed) serving the same city.
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 (~339 students)
Similar student-teacher ratio (~12.1:1)
Next steps
Verify locally before acting on Charles Barnum Magnet School's federal record.
- Compare Charles Barnum Magnet School against another school. Compare schools
- Groton 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 Charles Barnum Magnet School
How many students attend Charles Barnum Magnet School?
Charles Barnum Magnet School has 339 students enrolled. It is a public school in Groton, CT.
What is the student-teacher ratio at Charles Barnum Magnet School?
The student-teacher ratio at Charles Barnum Magnet School is 12.1:1, which is 0% higher than the Connecticut average of 12.1:1 and 23% lower than the national average of 15.7:1.
What percentage of students receive free lunch at Charles Barnum Magnet School?
26.5% of students at Charles Barnum Magnet School are eligible for free lunch, compared to the Connecticut average of 36.4%.
What is the racial and ethnic makeup of Charles Barnum Magnet School?
The largest demographic group at Charles Barnum Magnet School is White at 51.3% of enrollment, in Groton, CT. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 64.3/100.
What is the Resource Investment Index for Charles Barnum Magnet School?
Charles Barnum Magnet School has a Resource Investment Index of 38/100 (typical reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Charles Barnum Magnet School rank among public schools in Groton?
By Resource Investment Index, Charles Barnum Magnet School ranks #6 of 7 public schools in Groton, CT. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Groton on the city page.
Is Charles Barnum Magnet School a good school?
Charles Barnum Magnet School earns 38/100 on the Resource Investment Index, with class sizes near the Connecticut median. 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 Groton School District?
Besides Charles Barnum Magnet School, Groton School District also operates Robert E. Fitch High School (942 students), Groton Middle School (884 students), and Mystic River Magnet School (520 students). See the Groton 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.