Best Public Schools in Zip Code 91765

The 91765 zip code in Diamond Bar, California, is served by 10 public schools—seven elementary, two middle, and one high school—operating under two distinct districts, Walnut Valley Unified and Pomona Unified, which creates a notable contrast in academic performance within the same community.

Schools in the Walnut Valley Unified district consistently rank among the state's best, with standouts like Chaparral Middle (top 2% of middle schools) and Maple Hill Elementary (top 2% of elementary schools) demonstrating exceptional test scores and very low chronic absenteeism. Diamond Bar High also excels with a 95.8% graduation rate. In contrast, most schools in the Pomona Unified district, such as Lorbeer Middle and Armstrong Elementary, perform below state averages, though Pantera Elementary is a high-achieving exception within that district.

Key insights reveal that higher per-student spending does not guarantee better results, as the lowest-performing schools have the highest expenditures. There is a strong link between low chronic absenteeism and high academic performance across all schools. The success of Pantera Elementary shows that individual school practices can lead to outstanding outcomes even within a lower-ranked district, offering a valuable model for improvement.