Enrollment
367
Connecticut · 2024-25 NCES data
High school (grades 9-12) · Old Lyme, CT
Lyme-Old Lyme High School
Federal NCES profile for Lyme-Old Lyme High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 70/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 090354000763
👥 S:T ratio 67
📚 AP courses 100
🌟 Gifted program 30
🎓 Counselors 98
📋 Attendance 54
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Lyme-Old Lyme High School earns 70/100 on the Resource Investment Index, with class sizes smaller than 95% of Connecticut schools.
- #1 of 4
- public schools in Old Lyme · Resource Index
- 70
- Resource Index · Higher
- 8.3:1
- small classes for Connecticut
- 9.1%
- free-lunch eligible
Lyme-Old Lyme High School has class sizes smaller than 95% of Connecticut schools. Computed live against every Connecticut school reporting to NCES.
By Resource Investment Index, Lyme-Old Lyme High School ranks #1 of 4 public schools in Old Lyme, CT.
School address
District: Regional School District 18 · Connecticut
NCES ID 090354000763 Verify on NCES CCD record →
Teachers (FTE)
44.0
Federal CCD staff survey
Students per teacher
8.3:1
vs 12.1:1 Connecticut avg
-31% vs state
Free-lunch eligible
9.1%
vs 36.4% Connecticut avg
-75% vs state
Student-teacher ratio in context
How Lyme-Old Lyme High School compares with Connecticut and U.S. medians
What stands out at Lyme-Old Lyme High School
Lyme-Old Lyme High School is a lower-poverty, mid-sized high school in Old Lyme, Connecticut, enrolling 367 students.
Classes run notably small here: at 8.3:1, Lyme-Old Lyme High School is leaner than roughly 95% of Connecticut schools and 31% under the state's 12.1:1 norm, more adult attention per pupil than most peers.
Comparatively few students face economic hardship here, 9.1% free-meal eligibility runs 75% below the Connecticut average.
With 367 students, its enrollment sits close to the Connecticut median campus size.
Its Resource Investment Index lands in the upper third of 1,003 scored Connecticut schools.
Against 240 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #66.
Its student body is predominantly White (82% of enrollment) (diversity index 32/100).
On the academic-pipeline side it reports 27 Advanced Placement courses.
Counselor coverage is strong, about 8 students per counselor, inside the American School Counselor Association's recommended 250:1.
Attendance runs somewhat below the norm, with 18.5% of students chronically absent per the 2021-22 civil-rights collection.
Regional School District 18 also operates Mile Creek School (334 students) and Lyme-Old Lyme Middle School (271 students) alongside Lyme-Old Lyme 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 Lyme-Old Lyme High School compares
Lyme-Old Lyme 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 | 8.3:1 | ▼ 31% | 12.1:1 | 15.7:1 |
| Free-lunch eligible | 9.1% | ▼ 75% | 36.4% | 51.7% |
| Enrollment | 367 | top 59% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
8.3:1
Leaner classes than 94% of US schools, among the more generously staffed nationally.
367
Bigger than 42% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
9.1%
free-lunch eligible
- 75% below the Connecticut average of 36.4%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
8.3:1
students per teacher
- 31% below state mean
Top 5% in Connecticut - lower ratio than 95% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
18.5%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Funding equity
$27,918
per pupil, district-wide
- above 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
Counselors44.0 FTE
Per 8 students, the combined health-and-guidance staffing load for this school.
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
White 81.6%
Hispanic or Latino 8.2%
Asian 5.2%
Two or More 4.1%
African American 0.8%
Largest group: White at 81.6% of enrollment.
Student-body diversity index 32.3/100
Simpson diversity index - at 32.3, Lyme-Old Lyme High School is less mixed than the Connecticut school average of 50.5.
Programs
AP courses offered 27
Funding & spending
District-wide per-pupil expenditure for Regional School District 18, which includes Lyme-Old Lyme High School.
$27,918
Per student
+17%
vs Connecticut
Avg $23,870
+68%
vs U.S.
Avg $16,593
Revenue mix
Local 80.9%
State 14.9%
Federal 4.2%
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 Lyme-Old Lyme High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Mile Creek School | Similar size | Similar economic need | Higher S:T ratio |
| Lyme-Old Lyme Middle School | Smaller | Similar economic need | Similar S:T ratio |
| Lyme Consolidated School | Smaller | Similar economic need | Higher S:T ratio |
| Center School | Smaller | Similar economic need | Higher S:T ratio |
Comparisons are relative to Lyme-Old Lyme High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 334
- Students per teacher
- 12.8:1
- Resource Index
- 51/100
- Enrollment
- 271
- Students per teacher
- 9:1
- Resource Index
- 55/100
- Enrollment
- 226
- Students per teacher
- 12.6:1
- Resource Index
- 51/100
- Enrollment
- 80
- Students per teacher
- 13.3:1
- Resource Index
- 38/100
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 (~367 students)
Next steps
Verify locally before acting on Lyme-Old Lyme High School's federal record.
- Compare Lyme-Old Lyme High School against another school. Compare schools
- Regional School District 18'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 Lyme-Old Lyme High School
How many students attend Lyme-Old Lyme High School?
Lyme-Old Lyme High School has 367 students enrolled. It is a high school in Old Lyme, CT.
What is the student-teacher ratio at Lyme-Old Lyme High School?
The student-teacher ratio at Lyme-Old Lyme High School is 8.3:1, which is 31% lower than the Connecticut average of 12.1:1 and 47% 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 Lyme-Old Lyme High School?
9.1% of students at Lyme-Old Lyme High School are eligible for free lunch, compared to the Connecticut average of 36.4%.
What is the racial and ethnic makeup of Lyme-Old Lyme High School?
The largest demographic group at Lyme-Old Lyme High School is White at 81.6% of enrollment, in Old Lyme, CT.
What is the Resource Investment Index for Lyme-Old Lyme High School?
Lyme-Old Lyme High School has a Resource Investment Index of 70/100 (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 Lyme-Old Lyme High School rank among public schools in Old Lyme?
By Resource Investment Index, Lyme-Old Lyme High School ranks #1 of 4 public schools in Old Lyme, 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 Old Lyme on the city page.
Is Lyme-Old Lyme High School a good school?
Lyme-Old Lyme High School earns 70/100 on the Resource Investment Index, with class sizes smaller than 95% of 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 Regional School District 18?
Besides Lyme-Old Lyme High School, Regional School District 18 also operates Mile Creek School (334 students), Lyme-Old Lyme Middle School (271 students), and Lyme Consolidated School (226 students). See the Regional School District 18 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.