Diamond Bar city, California Demographics & Population 2026

Population Overview

Diamond Bar city is a mid-sized community located in California. The total population is 53,750. It ranks as the 174th most populous out of 1,577 cities and towns in California.

Age Demographics

The median age in Diamond Bar city is 45.6 years. This is 21% higher than the state median of 37.6 years.

Economy, Income & Housing

The median household income in Diamond Bar city is $106,602. This is 11% higher than the state median of $96,334. Compared to the national median of $78,538, household income here is 36% higher. The poverty rate stands at 9.1%. This is 24% lower than the state poverty rate of 12.0%. The unemployment rate is 5.1%. This is 21% lower than the state rate of 6.4%. The median home value is $867,000. Housing costs are 25% higher than the state median of $695,400. The home-value-to-income ratio of 8.1x suggests that housing affordability is a significant concern for many residents. 77.4% of occupied housing units are owner-occupied. This homeownership rate is 39% higher than the state average of 55.8%.

Race & Ethnicity

The largest racial or ethnic group in Diamond Bar city is Asian, making up 61.8% of the population. Hispanic or Latino residents account for 17.0%. The White (non-Hispanic) population (13.1%) is well below the state average of 34.6%. The Hispanic or Latino population (17.0%) is well below the state average of 39.8%. The Asian population is significantly higher than the state average (61.8% vs 15.0%).

Education

52.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 44% higher than the state rate of 36.5%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.8%. Notably, 18.4% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Diamond Bar city, California is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against California state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,577 Census-designated places in California. For official data, visit data.census.gov.