Summary:
Zip code 06441 (Higganum, Connecticut) is served by a single public high school, Haddam-Killingworth High School, which provides education for grades 9 through 12 with an enrollment of 466 students. This school is part of Regional School District 17, and because it is the only high school in the area, its performance defines the academic landscape for local families.
Haddam-Killingworth High School is a standout performer by nearly every measure. The school has earned top-tier state rankings, placing 14th out of 133 Connecticut high schools in 2025–2026 with a 5-star rating and an 89th percentile placement. The district, Regional School District 17, ranks 44th out of 153 districts with a 4-star rating. Academically, the school's ELA proficiency on the SAT reached 85.3% in 2025–2026, a full 30 points above the state average of 55.3%. Science proficiency on the NGSS exam hit 74.8%, compared with 50.5% statewide. Math proficiency, while a relative weakness at 48.8%, still outperforms the state average of 31.1% by nearly 18 points.
The school also excels beyond test scores. Its graduation rate of 97.6% far exceeds the state average of 91.2%, and chronic absenteeism is remarkably low at 6.9%, less than half the state rate of 16.4%. With a student–teacher ratio of 9.5 to 1, students benefit from a small, intimate learning environment. Only 13.73% of students qualify for free or reduced-price lunch, indicating a relatively low economic disadvantage rate. The school's results align closely with district outcomes, since Haddam-Killingworth serves as the district's sole high school. For parents considering this area, the school offers consistently strong academics, especially in ELA and science, with math standing out as the clearest opportunity for targeted improvement.
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