Summary:
Zip code 06241, covering the Dayville area of Connecticut, contains just one public high school: Killingly High School, which serves grades 9 through 12 with an enrollment of 744 students and a favorable student-to-teacher ratio of 11.1.
As the only high school in the area, Killingly High School presents a mixed academic profile. Its biggest strength is English Language Arts, where 62.6% of 11th graders meet proficiency on the SAT, outpacing the state average of 58.0%. However, math proficiency sits at just 16.6%—less than half the state average of 31.1%—and science proficiency is also below par at 36.1% versus the state's 47.7%. The school graduates 86.9% of its students, which is slightly better than the Killingly School District average of 86.0% but still short of the state's 91.2%. Chronic absenteeism is a serious concern: 29.1% of students are chronically absent, nearly double the state rate of 16.4% and significantly higher than the district's own 23.0%.
Statewide rankings for Killingly High School have been volatile over the past three years, moving from the 67th percentile in 2022–2023, sinking to the 34th percentile in 2023–2024, then rebounding to the 50th percentile in 2024–2025. With 42.88% of students eligible for free or reduced lunch, the school serves a notably economically diverse population, yet its strong ELA results show that success is achievable despite these challenges. Per-student spending is relatively high at $17,419, which raises questions about why math and science outcomes lag so far behind. For parents, the clearest takeaways are that Killingly High School excels in reading and writing but struggles significantly in STEM subjects, and that chronic absenteeism needs urgent attention. Focusing on math instruction and improving attendance would likely stabilize the school's performance and help more students graduate ready for college or careers.
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