Haddam-Killingworth Middle School
Killingworth, CT · Middle School · Grades 6-8
Haddam-Killingworth Middle School is a middle school in Killingworth, CT with 399 students enrolled and a 67% proficiency rate. Part of Regional School District 17. NCES data from the U.S. Department of Education.
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About This School
Haddam-Killingworth Middle School is a middle school located in Killingworth, Connecticut. The school serves 399 students in grades 6-8. The student-to-teacher ratio is 10.0:1.
According to EDFacts assessment data, 67% of students meet grade-level proficiency standards in combined math and reading.
12% of students qualify for free or reduced-price lunch.
Haddam-Killingworth Middle School is part of the Regional School District 17 in Connecticut.
How This School Compares
Haddam-Killingworth Middle School has 399 students enrolled, making it larger than the average school in Regional School District 17 (360 students). Its 67% proficiency rate is 1 percentage points above the district average of 66%. Compared to the Connecticut state average of 53%, the school performs 14 points higher. With a 10.0:1 student-teacher ratio, it offers smaller class sizes than the national average.
Frequently Asked Questions
Haddam-Killingworth Middle School has 399 students enrolled in grades 6-8. The student-to-teacher ratio is 10.0:1.
According to EDFacts data, 67% of students at Haddam-Killingworth Middle School meet grade-level proficiency standards in combined math and reading assessments.
Haddam-Killingworth Middle School is part of the Regional School District 17 in Killingworth, Connecticut. You can view all schools in this district on the district page.
All data on this page comes from the National Center for Education Statistics (NCES) Common Core of Data and EDFacts assessment results. These are official federal datasets published by the U.S. Department of Education.
School profiles are built from NCES directory data and EDFacts assessment results. Proficiency rates reflect combined math and reading performance. Graduation rates are reported for high schools with available data.
For this entity, the underlying data on this page comes from NCES Common Core of Data and EDFacts. The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
Every number on this page links back to NCES Common Core of Data and EDFacts; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. public schools and districts with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: NCES Common Core of Data, 2026.