Summary:
ZIP code 06419 contains three schools serving roughly 960 students in grades PK-8, all part of Regional School District 17, a highly rated district that ranks 44th out of 153 Connecticut districts with a 4-star rating. The schools form a coordinated pipeline: Killingworth Elementary School (PK-3), Haddam-Killingworth Intermediate School (grades 4-5), and Haddam-Killingworth Middle School (grades 6-8). Because no high school exists within the ZIP code, students leave 06419 for ninth grade.
Among the three schools, Haddam-Killingworth Intermediate School is the current academic standout. It earned 4 stars in 2025-2026, ranked 130th out of 491 elementary schools (74th percentile), and posted the largest average proficiency advantage over the state at roughly +17.6 percentage points. Its 4th-grade math proficiency reached 76.8% versus 52.1% statewide. Killingworth Elementary School has been historically strong, with a 78th-percentile rank in its most recent ranking, the lowest chronic absenteeism at 4.7%, and the highest per-pupil spending at $20,349; however, its 3rd-grade scores dropped sharply in 2025-2026. Haddam-Killingworth Middle School remains above state averages in every tested subject but has become less consistent, sliding from 33rd to 72nd in the state rankings.
Chronic absenteeism is very low across the district—roughly 5% at the two elementary schools—but rises to 11.1% at the middle school. With free/reduced-price lunch rates between 15.6% and 18.6%, this is a relatively advantaged community. One curious pattern emerged at the intermediate school: 4th-grade math proficiency (76.8%) was 22 points higher than 5th-grade math (54.7%), suggesting either a curriculum transition challenge or cohort differences. Overall, families in 06419 have access to a cohesive, above-average school system where Haddam-Killingworth Intermediate School is the strongest recent performer, but all three schools beat state averages.
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