Best Elementary Schools in Zip Code 94505

ZIP code 94505 has three listed elementary schools: Discovery Bay Elementary and Timber Point Elementary serve grades K–5, while Byron Institute for Independent Study serves K–8. In 2025–2026 all-grades results, the schools’ unweighted average was 44% in ELA, below the state’s 49%, and 44% in math, above the state’s 38%. The most important takeaway is that achievement varies substantially by school: the top-to-bottom spread is 34 percentage points in ELA and 29 points in math.

Discovery Bay stands out in ELA and math, with 61% proficient in each subject, compared with 45% ELA and 40% math at Timber Point, and 27% ELA and 32% math at Byron Institute. Discovery Bay leads Timber Point by 17 points in ELA and 21 in math; its advantages over Byron are 34 and 29 points, respectively. Discovery Bay is above state results in both subjects, while Byron is below the state in both. Science is a notable exception: Timber Point’s 40.0% and Discovery Bay’s 39.7% are nearly tied, with a 0.3-point difference; both exceed the state’s 36%.

Recent trends are mixed rather than uniformly upward or downward. The unweighted ELA average rose from 42% to 44% between 2024–2025 and 2025–2026, narrowing the group’s state gap from 7 points to 5; the math average rose from 43% to 44%, remaining about 6 points above the state. The two-school science average fell from 43% to 40%, and its advantage over the state narrowed from 10 points to 4. SchoolDigger ranks Discovery Bay at the 79th percentile and Timber Point at the 56th; their recent rank histories show a net rise of 3 percentile points for Discovery Bay and a decline of 7 for Timber Point. For 2024–2025, free/reduced lunch eligible shares were 41% at Discovery Bay, 26% at Timber Point and 42% at Byron Institute; these figures are context, not an explanation for results. Discovery Bay has 417 students and a 21.4:1 student-teacher ratio, compared with 362 and 24.6:1 at Timber Point, and 26 and 28.2:1 at Byron Institute. All-grades comparisons do not fully account for Byron’s different grade span, and its science result was suppressed.