Castle Rock Elementary

Castle Rock Elementary operates as a mid-tier K-5 school in Diamond Bar, California, overseen by Walnut Valley Unified. Current enrollment sits at 684 students spanning grades K through 5. Enrollment runs roughly 47% bigger than the state mean of about 465.

Castle Rock Elementary is one of 15 schools operated by Walnut Valley Unified, a district that teaches 13,992 students overall.

On demographics, Castle Rock Elementary shows that 70% of the student body identifies as Asian; the rest breaks down as 19% Hispanic, 5% multiracial, 3% White. That is meaningfully more Asian than the county at large, where the share is closer to 15%.

Looking at the economic backdrop, On paper, Castle Rock Elementary has 26 full-time-equivalent teachers, translating to a class-load average of around 26.1:1. Statewide, the average ratio sits near 22.3:1, putting Castle Rock Elementary higher than the state norm the norm. Around 27% of the student body qualifies for free or reduced-price meals, which schools and policymakers use as a rough income-mix signal. Set against Los Angeles County (around 70%), the school's rate is somewhat below typical.

After controlling for student poverty, Castle Rock Elementary tracks the demographic baseline. The model predicts 63.7% given the school's FRL share; actual proficiency is 67.7%.

In the area at large, community-level numbers for Los Angeles County indicate median household earnings sit near $90,112, roughly 36% of adults have completed at least a four-year degree, and census figures put the poverty rate at about 10%. Across Los Angeles County's 2244 public schools (combined enrollment of about 1,265,907 students), Castle Rock Elementary is one campus in the mix.

The closest other public school is Evergreen Elementary, roughly 0.7 miles away. Within five miles, there are 8 other public schools. On composite proficiency, Castle Rock Elementary comes 7th of 9 in the immediate cluster, beneath the nearby-schools average of 73.1%.

Geographically, the school is in a residential area.

Trend over the last 7 years. Over the past 7-year window, the student count stayed largely flat: 689 students in 2018 compared to 684 in 2025.

In the discussion threads here, the feed for Castle Rock Elementary typically covers science fair prep, picture-day reminders, and bus-route questions. Anyone with firsthand experience at this school can post or comment.