Serving 466 students in grades 9-12, Haddam-killingworth High School ranks in the top 30% of all schools in Connecticut for overall test scores (math proficiency is top 30%, and reading proficiency is top 30%).
The percentage of students achieving proficiency in math is 55-59% (which is higher than the Connecticut state average of 41%). The percentage of students achieving proficiency in reading/language arts is 70-74% (which is higher than the Connecticut state average of 50%).
The student-teacher ratio of 10:1 is lower than the Connecticut state level of 12:1.
Minority enrollment is 12% of the student body (majority Hispanic), which is lower than the Connecticut state average of 54% (majority Hispanic).
Quick Facts (26-27)
- Grades: 9-12
- Enrollment: 466 students
- Student-Teacher Ratio: 10:1
- Minority Enrollment: 12%
- Graduation Rate: ≥95% (Top 10% in CT)
- Overall Testing Rank: Top 30%
- Math Proficiency: 55-59% (Top 30%)
- Reading Proficiency: 70-74% (Top 20%)
- Science Proficiency: 45-49% (Btm 50%)
- Attendance Zone: Haddam-Killingworth High School's attendance zone covers the entire school district of Higganum, CT, encompassing approximately 82.1 square miles. Families typically face a drive of 10 to 15 minutes to reach the school, with the furthest edge of the zone being about 10.8 miles away.
- Source: National Center for Education Statistics (NCES), CT Dept. of Education
Top Rankings
Haddam-killingworth High School ranks among the top 20% of public schools in Connecticut for:
Category
Attribute
Reading/Language Arts Proficiency
Graduation Rate
School Overview
Haddam-killingworth High School's student population of 466 students has declined by 24% over five school years.
The teacher population of 49 teachers has declined by 9% over five school years.
Grades Offered
Grades 9-12
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
466 students
Showing 2015–2025. Full 39-year historical data available below ↓
Total Classroom Teachers
49 teachers
Showing 2015–2025. Full 39-year historical data available below ↓
Year Founded
1966
School Rankings
Haddam-killingworth High School ranks within the top 30% of all 939 schools in Connecticut (based off of combined math and reading proficiency testing data).
The diversity score of Haddam-killingworth High School is 0.22, which is less than the diversity score at state average of 0.68. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#221 out of 939 schools
(Top 30%)
(Top 30%)
Showing 2012–2023. Full 14-year historical data available below ↓
Math Test Scores (% Proficient)
55-59%
41%
Showing 2012–2023. Full 14-year historical data available below ↓
Reading/Language Arts Test Scores (% Proficient)
70-74%
50%
Showing 2011–2022. Full 13-year historical data available below ↓
Science Test Scores (% Proficient)
45-49%
47%
Student-Teacher Ratio
10:1
12:1
Showing 2015–2025. Full 39-year historical data available below ↓
Asian
2%
5%
Showing 2015–2025. Full 38-year historical data available below ↓
Hispanic
5%
32%
Showing 2015–2025. Full 38-year historical data available below ↓
Black
1%
12%
Showing 2015–2025. Full 38-year historical data available below ↓
White
88%
46%
Showing 2015–2025. Full 38-year historical data available below ↓
Two or more races
4%
5%
Showing 2015–2025. Full 12-year historical data available below ↓
All Ethnic Groups
Showing 2015–2025. Full 38-year historical data available below ↓
Graduation Rate
≥95%
88.2%
Showing 2014–2023. Full 13-year historical data available below ↓
Chronically Absent Students
(22-23)25.8%
19.3%
Eligible for Free Lunch
11%
38%
Showing 2015–2025. Full 34-year historical data available below ↓
Eligible for Reduced Lunch
2%
6%
Showing 2015–2025. Full 27-year historical data available below ↓
School Statewide Testing
School District Name
Sports
School Mascot
Cougars
Source: National Center for Education Statistics (NCES), CT Dept. of Education
Frequently Asked Questions
What is Haddam-killingworth High School's ranking?
Haddam-killingworth High School is ranked #221 out of 939 schools, which ranks it among the top 30% of public schools in Connecticut.
What percent of students have achieved state testing proficiency in math and reading?
55-59% of students have achieved math proficiency (compared to the 41% CT state average), while 70-74% of students have achieved reading proficiency (compared to the 50% CT state average).
What is the graduation rate of Haddam-killingworth High School?
The graduation rate of Haddam-killingworth High School is 95%, which is higher than the Connecticut state average of 88.2%.
How many students attend Haddam-killingworth High School?
466 students attend Haddam-killingworth High School.
What is the racial composition of the student body?
88% of Haddam-killingworth High School students are White, 5% of students are Hispanic, 4% of students are Two or more races, 2% of students are Asian, and 1% of students are Black.
What is the student-teacher ratio of Haddam-killingworth High School?
Haddam-killingworth High School has a student ration of 10:1, which is lower than the Connecticut state average of 12:1.
What grades does Haddam-killingworth High School offer ?
Haddam-killingworth High School offers enrollment in grades 9-12 (Supplemental Virtual).
What school district is Haddam-killingworth High School part of?
Haddam-killingworth High School is part of Regional School District 17.
School Calendar
View the Haddam-killingworth High School yearly calendar below. Note key dates such as:
Event
Date
District Closed | Thanksgiving Break
November 26, 2026 (Thursday)
District Closed | Thanksgiving Break
November 27, 2026 (Friday)
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