Enrollment
274
Connecticut · 2024-25 NCES data
High school (grades 9-12) · Groton, CT
Marine Science Magnet High School
Federal NCES profile for Marine Science Magnet High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 55/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 090345001606
👥 S:T ratio 56
📚 AP courses 65
🌟 Gifted program 30
🎓 Counselors 73
📋 Attendance 51
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Marine Science Magnet High School earns 55/100 on the Resource Investment Index, with class sizes near the Connecticut median.
- #1 of 3
- high schools in Groton · Resource Index
- 55
- Resource Index · Higher
- 11:1
- students per teacher
- 27.3%
- free-lunch eligible
Marine Science Magnet High School has class sizes near the Connecticut median. Computed live against every Connecticut school reporting to NCES.
By Resource Investment Index, Marine Science Magnet High School ranks #1 of 3 high schools in Groton, CT.
School address
Teachers (FTE)
25.0
Federal CCD staff survey
Students per teacher
11:1
vs 12.1:1 Connecticut avg
-9% vs state
Free-lunch eligible
27.3%
vs 36.4% Connecticut avg
-25% vs state
Student-teacher ratio in context
How Marine Science Magnet High School compares with Connecticut and U.S. medians
What stands out at Marine Science Magnet High School
Marine Science Magnet High School is a mid-sized high school in Groton, Connecticut, enrolling 274 students.
Class sizes run a bit leaner than typical: 11:1 puts it in the smaller third of Connecticut schools by student-teacher ratio.
Its free-meal eligibility rate of 27.3% lands close to the Connecticut typical range, neither a high- nor low-need campus by this measure.
Enrollment of 274 puts it in the smaller third of Connecticut schools by headcount.
Its Resource Investment Index sits near the middle of the pack among 1,003 scored Connecticut schools.
Against 212 statewide peers matched on enrollment and economic need, it ranks mid-pack at #100.
Its student body is led by White (61%) and Hispanic or Latino (19%) (diversity index 57/100).
On the academic-pipeline side it reports 13 Advanced Placement courses.
Counselor coverage is strong, about 137 students per counselor, inside the American School Counselor Association's recommended 250:1.
Attendance runs somewhat below the norm, with 19.7% of students chronically absent per the 2021-22 civil-rights collection.
Among Groton's high schools, it stands alongside Robert E. Fitch High School (942 students): Marine Science Magnet High School is smaller than that campus by headcount and runs heavier classes (11:1 vs 9.9:1).
Learn also operates Regional Multicultural Magnet School (469 students) and The Friendship School (460 students) alongside Marine Science Magnet 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 Marine Science Magnet High School compares
Marine Science Magnet High 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 | 11:1 | ▼ 9% | 12.1:1 | 15.7:1 |
| Free-lunch eligible | 27.3% | ▼ 25% | 36.4% | 51.7% |
| Enrollment | 274 | top 81% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
11:1
Leaner classes than 83% of US schools, among the more generously staffed nationally.
274
Bigger than 29% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
27.3%
free-lunch eligible
- 25% 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
11:1
students per teacher
- 9% below state mean
Top 38% in Connecticut - lower ratio than 62% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
19.7%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Support staff
Counselors2.0 FTE
Per 137 students, the combined health-and-guidance staffing load for this school.
Discipline context
16
in-school suspensions + 9 out-of-school
Suspension rate: 5.8 per 100 students. Combined in-school and out-of-school rate: 9.1 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 61.3%
Hispanic or Latino 19.2%
Two or More 12.5%
Asian 5.5%
African American 1.5%
Largest group: White at 61.3% of enrollment.
Student-body diversity index 56.8/100
Simpson diversity index - at 56.8, Marine Science Magnet High School is more mixed than the Connecticut school average of 50.5.
Programs
AP courses offered 13
How Marine Science Magnet High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Regional Multicultural Magnet School | Larger | Higher economic need | Similar S:T ratio |
| The Friendship School | Larger | Higher economic need | Higher S:T ratio |
| Three Rivers Middle College Magnet School | Smaller | Higher economic need | Higher S:T ratio |
Comparisons are relative to Marine Science Magnet High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 469
- Students per teacher
- 12.3:1
- Resource Index
- 22/100
- Enrollment
- 460
- Students per teacher
- 13.5:1
- Resource Index
- 49/100
- Enrollment
- 92
- Students per teacher
- 18.4:1
- Resource Index
- 53/100
Similar high schools in Groton
2 comparable high schools (grades 9-12) serving the same city.
Similar high 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 (~274 students)
Next steps
Verify locally before acting on Marine Science Magnet High School's federal record.
- Compare Marine Science Magnet High School against another school. Compare schools
- Learn'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 Marine Science Magnet High School
How many students attend Marine Science Magnet High School?
Marine Science Magnet High School has 274 students enrolled. It is a high school in Groton, CT.
What is the student-teacher ratio at Marine Science Magnet High School?
The student-teacher ratio at Marine Science Magnet High School is 11:1, which is 9% lower than the Connecticut average of 12.1:1 and 30% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Marine Science Magnet High School?
27.3% of students at Marine Science Magnet High School are eligible for free lunch, compared to the Connecticut average of 36.4%.
What is the racial and ethnic makeup of Marine Science Magnet High School?
The largest demographic group at Marine Science Magnet High School is White at 61.3% of enrollment, in Groton, CT. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 56.8/100.
What is the Resource Investment Index for Marine Science Magnet High School?
Marine Science Magnet High School has a Resource Investment Index of 55/100 (higher 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 Marine Science Magnet High School rank among high schools in Groton?
By Resource Investment Index, Marine Science Magnet High School ranks #1 of 3 high 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 high schools in Groton on the city page.
Is Marine Science Magnet High School a good school?
Marine Science Magnet High School earns 55/100 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 Learn?
Besides Marine Science Magnet High School, Learn also operates Regional Multicultural Magnet School (469 students), The Friendship School (460 students), and Three Rivers Middle College Magnet School (92 students). See the Learn 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.