Summary:
ZIP code 91791 has 10 schools—six elementary, one middle, and three high schools—serving grades K–12 across Covina-Valley Unified and West Covina Unified. Nine schools have 2025–26 proficiency results; Wescove Elementary has none. The most important finding is how widely results vary: the strongest and weakest schools are separated by 75 points in ELA, 68 in math, and 56 in science, so a ZIP-wide average can hide very different school outcomes.
Mt. SAC Early College Academy at West Covina leads all-grades ELA at 83%, 33 points above the 49% state result; Merced Elementary leads math at 71%, 33 points above the state. Merced also leads the reported ELA and math comparisons in each of grades 3, 4, and 5. Mesa Elementary leads science at 58%, 22 points above the state. At the other end, Coronado High (Continuation) has the lowest results in all three subjects: 7% in ELA, 4% in math, and 2% in science. Those results are 42, 35, and 34 points below the state, respectively.
Recent changes are mixed: the nine-school average for ELA was essentially unchanged from 2024–25 to 2025–26, while math and science each fell 2 points; state results rose 1 point in math and 3 in science. Individual schools also diverged: science rose 15 points at Mesa but fell 16 at Vine Elementary. SchoolDigger ranks Merced at the 88th percentile among California elementary schools and Mt. SAC at the 81st percentile among high schools, while Coronado is at the 5th percentile. School characteristics offer context, not a simple guide to results: in 2024–25, free/reduced lunch eligible shares were 77% at Merced and 54% at Mesa, while Merced’s student-teacher ratio was 29.3, compared with 21.3–24.7 at the other K–5 schools.
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