Summary:
Zip code 95222 has two schools in the Mark Twain Union Elementary district: Mark Twain Elementary serves kindergarten through grade 8 and enrolls 507 students, while Altaville School for Independent Study serves grades 5–8 and enrolls 9. The most important finding is that Mark Twain’s 2025–2026 all-grade proficiency was below California’s in all three subjects, with the largest gap in math: 18% proficient versus 38% statewide, a 21-point difference.
Mark Twain is the only school with reportable 2025–2026 all-grade scores; Altaville’s scores are suppressed, so the data do not support ranking the two schools against each other. Within Mark Twain, fourth-grade math stands out: 47% proficient, 5 points above the state’s 42% and 10 points above the district’s 38%. Seventh- and eighth-grade ELA were also close to state results, at 49% versus 51% and 49% versus 49%, respectively. The sharpest grade-level weakness was sixth-grade math, at 5% compared with 37% statewide; sixth-grade ELA was also low, at 19% versus 48% statewide.
Mark Twain improved in all three subjects from 2024–2025 to 2025–2026: ELA rose 3 points to 36%, math rose 2 points to 18%, and science rose 9 points to 22%. Its gaps with the state narrowed by 3 points in ELA, 1 in math and 6 in science, though all-grade results remain below state levels. SchoolDigger’s ranking for Mark Twain rose from the 3rd percentile in 2023–2024 to the 13th in 2024–2025 and 17th in 2025–2026. As context, the 2024–2025 free/reduced lunch eligible measure was 68% at Mark Twain and 33% at Altaville; student-teacher ratios were 21.1 and 11.2, respectively. Mark Twain’s 2025–2026 chronic absenteeism rate was 21%, close to the district’s 21% and above the state’s 18%.
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