Summary:
Killingworth, Connecticut is served by two public schools in Regional School District 17 — Haddam-Killingworth Intermediate School (grades 4–5, 280 students) and Haddam-Killingworth Middle School (grades 6–8, 423 students) — with no high schools in the town itself and both schools sharing a campus on Route 81.
Both schools are strong performers compared to Connecticut state averages, but they are heading in different directions. Haddam-Killingworth Intermediate School improved its statewide ranking from the 69th percentile in 2024-2025 to the 74th percentile in 2025-2026, earning a 4-star rating. Its 4th-grade math proficiency is 76.8% versus 52.1% statewide, and its 5th-grade ELA proficiency is 72.7% versus 53.5% statewide. Chronic absenteeism is just 5.5%, well below the district average of 7.7% and the state average of 16.4%. In contrast, Haddam-Killingworth Middle School saw its ranking drop from 33rd (87th percentile) in 2024-2025 to 72nd (72nd percentile) in 2025-2026. Proficiency fell across ELA (from roughly 73% to 63%), math (64% to 58%), and science (69.5% to 57.8%), though the school still exceeds state averages in every subject and retains a 4-star rating.
The middle school also struggles more with attendance, posting a chronic absenteeism rate of 11.1% — double the intermediate school’s 5.5% and above the district average. Math proficiency tends to decline with grade level across the two schools, from 76.8% in 4th grade down to 52.3% in 8th grade, with a notable drop between 5th and 6th grade. Both schools benefit from low poverty levels (15.6% to 18.6% free/reduced-price lunch), low student-teacher ratios (11.2 to 12.7), and the middle school reports a high per-student spending of $17,295. For parents, the takeaway is that Regional School District 17 offers well-resourced, above-average schools — with the intermediate school improving and the middle school still strong but worth watching for its attendance and recent test-score dip.
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