Haddam-Killingworth High School

Haddam-Killingworth High School, a low-enrollment secondary school in Higganum, Connecticut, overseen by Regional School District 17, works with 466 students, covering grades 9 through 12. That puts it 41% leaner than the typical public school in Connecticut, which averages around 788 students.

Across the 5 schools in Regional School District 17 (1,704 students total), Haddam-Killingworth High School accounts for its share of the district's footprint.

On the student-mix side, Haddam-Killingworth High School shows that the student body is overwhelmingly White (88%). Other groups include 5% Hispanic, 3% multiracial, 2% Asian.

Looking at school resources, Staff filings list 49 full-time-equivalent teachers, which works out to roughly 9.6:1 students per teacher. Statewide, the average ratio sits near 12.3:1, putting Haddam-Killingworth High School tighter than the state norm the norm. Roughly 14% of students at Haddam-Killingworth High School qualify for free or reduced-price lunch, which schools and policymakers use as a rough income-mix signal. That share is below Lower Connecticut River Valley Planning Region's rate of about 32%.

In the broader community, Lower Connecticut River Valley Planning Region reports that median household earnings sit near $104,428, about 46% of the adult population holds a bachelor's degree or above, and census figures put the poverty rate at about 4%. In all, Lower Connecticut River Valley Planning Region runs 57 public schools (combined enrollment of about 19,075 students), of which Haddam-Killingworth High School is one.

The closest other public school is Burr District Elementary School, roughly 1.4 miles away. 8 of the 8 nearest public schools sit inside a ten-mile radius, suggesting a relatively low-density school footprint.

The campus sits in a countryside setting.

Five-year trend. Haddam-Killingworth High School's enrollment has declined 31% since 2018, when it stood at 673 (now 466). The White share of enrollment edged down from 94% to 88% over that span. Class-load math has tightened: from 11.8:1 in 2018 to 9.6:1 in 2025.

On the community side, the page collects discussion, questions, and updates around classroom updates, athletics, and weather closures. Parents, students, alumni, and staff are welcome to weigh in.