ZIP 91765 vs ZIP 92823

This side-by-side compares ZIP 91765 (Diamond Bar, CA) and ZIP 92823 (Brea, CA) using the same Census ACS 5-Year table fields for both — no averages swapped in, no national proxies. ZIP 91765 has a population of 46,457 at 948 people per square mile, while ZIP 92823 has 3,613 at 129 per square mile. That difference in population size and density alone reshapes how every other metric should be interpreted — a higher-income ZIP with 1,200 residents behaves very differently from one with 45,000.

On income and education, ZIP 91765 reports a median household income of $105,565 against $169,900 in ZIP 92823, with per-capita income of $48,949 vs $66,825. The share of adults holding a bachelor's degree or higher is 53.7% in 91765 and 64.7% in 92823. Poverty rate reads 10.7% vs 9.8%, and unemployment 5.0% vs 2.8% — these four fields alone drive most of the difference in the scorecard grades you will see for each ZIP.

Housing separates these two ZIPs further: median home value sits at $915,100 in 91765 versus $1,070,000 in 92823, with median rent of $2,486 and $3,501 per month respectively. Homeownership rate is 77.5% vs 75.6%. When reading the comparison table below, focus on paired metrics rather than single winners — a ZIP with lower home values and lower income is not strictly "worse" if rent-to-income ratios and commute times land in the same zone. Every value is pulled from the exact same ACS table so the two columns are genuinely comparable.