Haddam-Killingworth High School
🇺🇸 Official data · 2025Higganum, Connecticut 06441 · Regional School District 17
#25 of 180 high schools in Connecticut
#597 of 16,910 nationally
About Haddam-Killingworth High School
Haddam-Killingworth High School is a public high located in Higganum, in the Regional School District 17 school district of Connecticut, United States. It caters for Grades 9–12. In 2025 it enrolled 466 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 85.5 out of 100, placing it in the top 5% of high schools in United States and 25th of 180 ranked high schools in Connecticut. Its strongest component is community advantage (fewer free/reduced-price lunch) (96th percentile), and its weakest is math proficiency (73th percentile).
Other published figures: enrollment 466.
There are 3 schools in Higganum; Haddam-Killingworth High School ranks 3rd of 3 scored schools there.
Success Index (US) breakdown
Each component is a percentile against high schools across United States.
- Math proficiency (30%)57%
- Reading proficiency (30%)82%
- Community advantage (fewer free/reduced-price lunch) (25%)13.7%
- Students per teacher (15%)9.7
The Success Index (US) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for Haddam-Killingworth High School by the official sources.
- Enrollment
- 466
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 13.7%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 9.7
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 82%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 57%
- Share of tested students proficient or above (all students, all grades).
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Schools near Haddam-Killingworth High School
Closest schools by straight-line distance, with their Success Index (US).
Burr District Elementary School
Higganum · Public elementary · Grades K–3
278 students · 2.3 km away
Coginchaug Regional High School
Durham · Public high · Grades 9–12
356 students · 9.0 km away
Haddam-Killingworth Middle School
Killingworth · Public middle · Grades 6–8
423 students · 9.0 km away
Haddam-Killingworth Intermediate School
Killingworth · Public elementary · Grades 4–5
280 students · 9.0 km away
Frank Ward Strong School
Durham · Public middle · Grades 6–8
319 students · 9.8 km away
Killingworth Elementary School
Higganum · Public elementary · Grades PK–3
257 students · 10 km away
Nathan Hale-Ray High School
Moodus · Public high · Grades 9–12
262 students · 10 km away
Bielefield School
Middletown · Public elementary · Grades PK–5
251 students · 10 km away
Farm Hill School
Middletown · Public elementary · Grades PK–5
316 students · 11 km away
Beman Middle School
Middletown · Public middle · Grades 6–8
977 students · 11 km away
Similar schools
Public high schools in Connecticut with a comparable Enrollment.
Sport and Medical Sciences Academy
Hartford · Public high · Grades 6–12
463 students
The Morgan School
Clinton · Public high · Grades 9–12
473 students
Oxford High School
Oxford · Public high · Grades 9–12
476 students
The Gilbert School
Winsted · Public high · Grades 7–12
452 students
Shepaug Valley School
Washington · Public high · Grades 6–12
486 students
East Hampton High School
East Hampton · Public high · Grades 9–12
488 students
Frequently asked questions
Is Haddam-Killingworth High School a good school?
Haddam-Killingworth High School has a Success Index (US) of 85.5 out of 100 (Top 5% of high schools in United States) and ranks #25 of 180 in Connecticut. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does Haddam-Killingworth High School rank in Connecticut?
Haddam-Killingworth High School ranks #25 of 180 high schools in Connecticut and #597 of 16,910 nationally on the Success Index (US) (2025 data).
How many students attend Haddam-Killingworth High School?
Haddam-Killingworth High School had 466 students in 2025.
Is Haddam-Killingworth High School a elementary school or a high school?
Haddam-Killingworth High School is classified as a high covering Grades 9–12. It is a public school.
What other schools are near Haddam-Killingworth High School?
There are 10 schools within 15 km of Haddam-Killingworth High School; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.