Summary:
Regional School District 10 is served by a single high school, Lewis S. Mills High School, which enrolls 614 students in grades 9–12 in Burlington, Connecticut, and consistently outperforms state averages across key academic measures.
Lewis S. Mills is a high-performing school, earning a 4-star rating from SchoolDigger and ranking 19th out of 133 Connecticut high schools in the most recent year — up from 31st the previous two years. The school’s graduation rate is exceptional at 98.3%, compared to the state average of 91.2%. On the 11th-grade SAT, 77% of students met proficiency in English Language Arts versus 55.3% statewide, and 50% met proficiency in math versus 31.3% statewide. Science proficiency on the NGSS is 74.4%, far above the state’s 50.5%. With a low poverty indicator (14.82% free/reduced lunch) and a favorable student-teacher ratio of 11.4:1, the school provides a supportive environment that aligns with its strong academic outcomes.
Math is the relative weakness but is improving rapidly, jumping from 40.9% proficiency in 2024–2025 to 50% in 2025–2026 — a 9.1-point gain, the largest of any subject. ELA and science also improved, by 3.4 and 1.8 points respectively. Chronic absenteeism stands at 11.8%, which is well below the state rate of 16.4% but nearly double the district average of 6.0% — likely reflecting typical high-school attendance patterns. Per-student spending is listed at $16,139, though that data is from 2018–2019. Overall, Lewis S. Mills High School is an academically strong, well-regarded school within Regional School District 10, with excellent graduation rates, high proficiency in ELA and science, and continued progress in math.
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