- Enrollment
- 936
- Students per teacher
- 9.8:1
- Resource Index
- 57/100
High school (grades 9-12) · Wallingford, CT
Mark T. Sheehan High School
Federal NCES profile for Mark T. Sheehan High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 65/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 090474000956
👥 S:T ratio 61
🌟 Gifted program 70
🎓 Counselors 66
📋 Attendance 61
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mark T. Sheehan High School earns 65/100 on the Resource Investment Index, with class sizes smaller than 82% of Connecticut schools.
- #1 of 11
- public schools in Wallingford · Resource Index
- 65
- Resource Index · Higher
- 9.8:1
- small classes for Connecticut
- 21.7%
- free-lunch eligible
Mark T. Sheehan High School has class sizes smaller than 82% of Connecticut schools. Computed live against every Connecticut school reporting to NCES.
By Resource Investment Index, Mark T. Sheehan High School ranks #1 of 11 public schools in Wallingford, CT.
School address
District: Wallingford School District · Connecticut
NCES ID 090474000956 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
+2 students YoY
Mark T. Sheehan High School held near 724 students from 2022-23 to 2023-24 (+2 headcount).
Teacher FTE lost 69.7 → 63.1 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
+2 students YoY 090474000956 · Wallingford, CT High · MID · TRAD
673 enr · 9.8:1 · 21.7% lunch · RII 65
Nearest enrollment peer: Lyman Hall High School (936 students)
Mark T. Sheehan High School held near 724 students from 2022-23 to 2023-24 (+2 headcount). Teacher FTE lost 69.7 → 63.1 across the same CCD years. Read with this school → · District book → · Connecticut schools → · Find another →
Mark T. Sheehan High School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Lyman Hall Hig
Lyman Hall High School
936 students
- This school
Mark T. Sheehan High School
673 students
- Dag Hammarskjo
Dag Hammarskjold Middle School
593 students
- James H. Moran
James H. Moran Middle School
531 students
- Cook Hill Scho 357
Cook Hill School
357 students
- Moses Y. Beach 326
Moses Y. Beach School
326 students
What this shows Mark T. Sheehan High School reports 673 students on the CCD universe file.
How Mark T. Sheehan High School compares
Mark T. Sheehan High School held steady on CCD headcount: ratios and free-lunch share vs Connecticut and U.S. means.
| Metric | This school | vs Connecticut | Connecticut avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 9.8:1 | ▼ 19% | 12.1:1 | 15.7:1 |
| Free-lunch eligible | 21.7% | ▼ 40% | 36.4% | 51.7% |
| Enrollment | 673 | top 17% | - | - |
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.
673
Bigger than 78% of US schools by enrollment, mid-sized for the country.
Equity indicators methodology
Economic need
21.7%
free-lunch eligible
- 40% 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
9.8:1
students per teacher
- 19% below state mean
Top 18% in Connecticut - lower ratio than 82% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
15.5%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Funding equity
$25,569
per pupil, district-wide
- above Connecticut avg of $24,680
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors4.0 FTE
Per 168 students, the combined health-and-guidance staffing load for this school.
Discipline context
44
in-school suspensions + 31 out-of-school
Suspension rate: 6.5 per 100 students. Combined in-school and out-of-school rate: 11.1 per 100 students. Reported via the Civil Rights Data Collection. Includes 4 expulsions.
Student demographics
White 64.9%
Hispanic or Latino 21.5%
Asian 6.4%
Two or More 4.5%
African American 2.4%
American Indian / Alaska Native 0.1%
Native Hawaiian / Pacific Islander 0.1%
Largest group: White at 64.9% of enrollment.
Student-body diversity index 52.6/100
Simpson diversity index - at 52.6, Mark T. Sheehan High School is more mixed than the Connecticut school average of 50.5.
Programs
AP courses offered 24
Gifted & talented Yes
District finance for Wallingford School District reports $25,569 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Mark T. Sheehan High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Lyman Hall High School | Larger | Similar economic need | Similar S:T ratio |
| Dag Hammarskjold Middle School | Similar size | Similar economic need | Similar S:T ratio |
| James H. Moran Middle School | Similar size | Similar economic need | Similar S:T ratio |
| Cook Hill School | Smaller | Higher economic need | Higher S:T ratio |
| Moses Y. Beach School | Smaller | Similar economic need | Higher S:T ratio |
Comparisons are relative to Mark T. Sheehan High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 593
- Students per teacher
- 10.2:1
- Resource Index
- 58/100
- Enrollment
- 531
- Students per teacher
- 8.8:1
- Resource Index
- 63/100
- Enrollment
- 357
- Students per teacher
- 11.5:1
- Resource Index
- 49/100
- Enrollment
- 326
- Students per teacher
- 12.1:1
- Resource Index
- 40/100
Similar high schools in Wallingford
1 comparable high schools (grades 9-12) serving the same city.
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~673 students)
Frequently asked questions about Mark T. Sheehan High School
How many students attend Mark T. Sheehan High School?
Mark T. Sheehan High School has 673 students enrolled. It is a high school in Wallingford, CT. CCD year-over-year: 722 (2022-23) → 724 (2023-24), nearly flat (+2).
What is the student-teacher ratio at Mark T. Sheehan High School?
The student-teacher ratio at Mark T. Sheehan High School is 9.8:1, which is 19% lower than the Connecticut average of 12.1:1 and 38% 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 Mark T. Sheehan High School?
21.7% of students at Mark T. Sheehan High School are eligible for free lunch, compared to the Connecticut average of 36.4%.
What is the racial and ethnic makeup of Mark T. Sheehan High School?
The largest demographic group at Mark T. Sheehan High School is White at 64.9% of enrollment, in Wallingford, CT. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 52.6/100.
What is the Resource Investment Index for Mark T. Sheehan High School?
Mark T. Sheehan High School has a Resource Investment Index of 65/100 (higher reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Mark T. Sheehan High School rank among public schools in Wallingford?
By Resource Investment Index, Mark T. Sheehan High School ranks #1 of 11 public schools in Wallingford, 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 Wallingford on the city page.
What other schools are in Wallingford School District?
Besides Mark T. Sheehan High School, Wallingford School District also operates Lyman Hall High School (936 students), Dag Hammarskjold Middle School (593 students), and James H. Moran Middle School (531 students). See the Wallingford School District district page for the complete list.