Summary
Mill Valley Middle in Mill Valley, California, serves grades 6–8 and enrolls 721 students. For 2025–26, SchoolDigger gives it 5 stars and ranks it 82nd of 2,703 California schools, in the 97th percentile; its district, Mill Valley Elementary, ranks 22nd of 968, in the 98th percentile, also with 5 stars. The main takeaway for families is that the school performs strongly across subjects, with math its clearest relative weakness.
Mill Valley’s strongest nearby showing is in ELA: its 84% proficiency rate is the highest among 10 comparable schools, 35 points above the state’s 49% and 2 points above the district’s 82%. It is also 18 points above the nearby-school average of 66%. Science is second among those schools at 72%, 36 points above the state’s 36%, but 2 points below the district’s 74%. Math is third among the 10 at 72%—well above the state’s 38%, but 6 points below the district’s 78% and 15 points above the nearby average of 57%. Together, those comparisons make math the subject with the most room to improve relative to local and district results.
Since 2022–23, proficiency has risen by 5 points in ELA, 1 point in math and 2 points in science, although math is 3 points below its 2023–24 peak. ELA’s lead over the state widened by 3 points over that period, while the math and science leads narrowed by 2 and 3 points. SchoolDigger has kept Mill Valley at 5 stars and between the 96th and 98th percentiles in every year listed. Context measures include a student-teacher ratio of 15.6 in 2024–25 and 6% free/reduced lunch eligible that year. SchoolDigger’s measure of how well the school serves Asian Students ranked it in the 49th percentile in 2024–25, compared with the school’s overall 97th percentile. Its Low Socio Economic Status Students ranking also fell from the 99th percentile in 2023–24 to the 84th in 2024–25, then rose to the 88th in 2025–26.
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