Summary
Millis High School is a small public high school in Millis, MA, serving grades 9–12 with 286 students, making it the smallest high school among its nearby comparison schools—the next-smallest, Norfolk County Agricultural, enrolls 597 students.
In 2025–2026 the school ranked 114th of 353 in Massachusetts (68th percentile, 3 stars), down from 57th of 349 (84th percentile, 4 stars) the year before; its district, Millis, ranks 127th of 351 statewide. Completion outcomes are a clear strength: a 98.7% graduation rate in 2024–2025—fourth-highest among nearby schools—and a 1.3% dropout rate, improved from 92.1% and 5.3% in 2022–2023. Its student-teacher ratio of 10.6 is the third-lowest in the comparison group, and per-pupil spending was $18,898 in 2020–2021, above Holliston High, Franklin High, and Walpole High but below Dover-Sherborn Regional High.
On 2025–2026 10th-grade MCAS, Millis scored above the state in ELA (53.23 vs. 45.48), math (47.62 vs. 43.73), and Biology (56.52 vs. 37.68), but slightly below in Science 10 (39.29 vs. 40.50). Proficiency dropped sharply from the prior year, when ELA was 77.63 and science 68.42. Compared with neighbors, Millis sits mid-tier—above Norwood High and Norfolk County Agricultural, but well behind Dover-Sherborn, Medfield Senior High, and Holliston High. Special education students have been a consistent strength, ranking near the 70th percentile, while low-socioeconomic-status students swung from the 92nd percentile in 2022–2023 to 56th in 2025–2026. With only 286 students, year-to-year swings tend to be pronounced, and some data (spending through 2020–2021, free/reduced-price lunch) are limited.
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