Summary:
ZIP code 92504 has two Riverside Unified middle schools, both serving grades 7–8: Frank Augustus Miller Middle enrolls 844 students and Sierra Middle enrolls 829. Despite their similar size and grade span, their 2025–26 proficiency results differ substantially in every subject, with the widest gap in math: 31 percentage points.
Miller stands out at the top, with 68% proficient in ELA, 52% in math and 47% in science; Sierra is lower in all three, at 41%, 21% and 29%, respectively. The gap is 27 points in ELA, 31 in math and 18 in science. Miller is above the state result in all three subjects, while Sierra is below it in all three. SchoolDigger ranks Miller 434th of 2,703 schools (84th percentile, 4 stars) and Sierra 1,684th (38th percentile, 2 stars).
Both schools improved in ELA and math from 2024–25 to 2025–26, but science moved in opposite directions: Miller’s results changed by +5 points in ELA, +4 in math and −1 in science; Sierra’s changed by +1, +1 and +8 points, respectively. Other reported measures provide context, not an explanation for the score differences: in 2024–25, free/reduced lunch eligible was 57% at Miller and 89% at Sierra, while student-teacher ratios were 23.6 and 22.2. Miller’s SchoolDigger rank improved from 520th in 2023–24 to 434th in 2025–26; Sierra’s moved from 1,654th to 1,684th. These comparisons describe the reported results and measures but do not establish what caused the differences.
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