Enrollment
744
Connecticut · 2024-25 NCES data
High school (grades 9-12) · Dayville, CT
Killingly High School
Federal NCES profile for Killingly High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 24/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 090207000392
👥 S:T ratio 55
📚 AP courses 15
🌟 Gifted program 30
🎓 Counselors 0
📋 Attendance 21
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Killingly High School earns 24/100 on the Resource Investment Index, with class sizes near the Connecticut median.
- #3 of 3
- public schools in Dayville · Resource Index
- 24
- Resource Index · Lower
- 11.3:1
- students per teacher
- 34.5%
- free-lunch eligible
Killingly High School has class sizes near the Connecticut median. Computed live against every Connecticut school reporting to NCES.
By Resource Investment Index, Killingly High School ranks #3 of 3 public schools in Dayville, CT.
School address
District: Killingly School District · Connecticut
NCES ID 090207000392 Verify on NCES CCD record →
Teachers (FTE)
66.0
Federal CCD staff survey
Students per teacher
11.3:1
vs 12.1:1 Connecticut avg
-7% vs state
Free-lunch eligible
34.5%
vs 36.4% Connecticut avg
-5% vs state
Student-teacher ratio in context
How Killingly High School compares with Connecticut and U.S. medians
What stands out at Killingly High School
Killingly High School is a large high school in Dayville, Connecticut, enrolling 744 students.
At 11.3:1, 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 34.5% lands close to the Connecticut typical range, neither a high- nor low-need campus by this measure.
Enrollment of 744 puts it in the larger third of Connecticut schools by headcount.
Its Resource Investment Index trails 96% of the 1,003 Connecticut schools with a score on record, one of the lower results on this measure.
Among 137 similarly sized, similarly resourced-need Connecticut schools statewide, it ranks #135, in the lower tier once campus size and economic need are matched.
Its student body is led by White (77%) and Hispanic or Latino (13%) (diversity index 39/100).
On the academic-pipeline side it reports 3 Advanced Placement courses.
Counselor access is stretched at roughly 744 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Chronic absenteeism is elevated: 31.7% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Killingly School District also operates Killingly Intermediate School (692 students) and Killingly Memorial School (485 students) alongside Killingly 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 Killingly High School compares
Killingly 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 | 11.3:1 | ▼ 7% | 12.1:1 | 15.7:1 |
| Free-lunch eligible | 34.5% | ▼ 5% | 36.4% | 51.7% |
| Enrollment | 744 | top 13% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
11.3:1
Leaner classes than 81% of US schools, among the more generously staffed nationally.
744
Bigger than 83% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
34.5%
free-lunch eligible
- 5% 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
11.3:1
students per teacher
- 7% below state mean
Top 44% in Connecticut - lower ratio than 56% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
31.7%
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
$21,358
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
Counselors1.0 FTE
Per 744 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 76.9%
Hispanic or Latino 13.2%
Two or More 5.4%
African American 2.6%
Asian 1.9%
American Indian / Alaska Native 0.1%
Largest group: White at 76.9% of enrollment.
Student-body diversity index 38.7/100
Simpson diversity index - at 38.7, Killingly High School is less mixed than the Connecticut school average of 50.5.
Programs
AP courses offered 3
Funding & spending
District-wide per-pupil expenditure for Killingly School District, which includes Killingly High School.
$21,358
Per student
-11%
vs Connecticut
Avg $23,870
+29%
vs U.S.
Avg $16,593
Revenue mix
Local 50.5%
State 43.2%
Federal 6.2%
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 Killingly High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Killingly Intermediate School | Similar size | Higher economic need | Similar S:T ratio |
| Killingly Memorial School | Smaller | Higher economic need | Similar S:T ratio |
| Killingly Central School | Smaller | Higher economic need | Similar S:T ratio |
Comparisons are relative to Killingly High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 692
- Students per teacher
- 11.7:1
- Resource Index
- 31/100
- Enrollment
- 485
- Students per teacher
- 12.1:1
- Resource Index
- 33/100
- Enrollment
- 317
- Students per teacher
- 9.9:1
- Resource Index
- 40/100
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 (~744 students)
Next steps
Verify locally before acting on Killingly High School's federal record.
- Compare Killingly High School against another school. Compare schools
- Killingly 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 Killingly High School
How many students attend Killingly High School?
Killingly High School has 744 students enrolled. It is a high school in Dayville, CT.
What is the student-teacher ratio at Killingly High School?
The student-teacher ratio at Killingly High School is 11.3:1, which is 7% lower than the Connecticut average of 12.1:1 and 28% 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 Killingly High School?
34.5% of students at Killingly High School are eligible for free lunch, compared to the Connecticut average of 36.4%.
What is the racial and ethnic makeup of Killingly High School?
The largest demographic group at Killingly High School is White at 76.9% of enrollment, in Dayville, CT.
What is the Resource Investment Index for Killingly High School?
Killingly High School has a Resource Investment Index of 24/100 (lower 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 Killingly High School rank among public schools in Dayville?
By Resource Investment Index, Killingly High School ranks #3 of 3 public schools in Dayville, 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 Dayville on the city page.
Is Killingly High School a good school?
Killingly High School earns 24/100 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 Killingly School District?
Besides Killingly High School, Killingly School District also operates Killingly Intermediate School (692 students), Killingly Memorial School (485 students), and Killingly Central School (317 students). See the Killingly 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.