Diamond Bar, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Diamond Bar, California is 53,750 as of the 2023 American Community Survey, making it the 174th-largest city in California. The median household income is $106,602, the median home value is $867,000, and the median age is 45.6.
The population has declined 5.9% since 2010 (55,588 → 52,292).
53,750
Population
3613
People / sq mi
$106,602
Median Income
$867,000
Median Home Value
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Diamond Bar covers 14.9 sq mi of land at 3613 people per square mile.
About Diamond Bar, CA
Housing cost is the defining feature of Diamond Bar: the median home is valued at $867,000. With 53,750 residents, Diamond Bar is a city in California.
Median household income is $106,602, above the US median of $78,538. Poverty runs at 6.9%, below the national 12.4%. Home prices are steep, with the typical property valued at $867,000, with typical rent around $2,422.
College attainment is above the local norm at 52.7%, above the national 35.0%. A solid 16.5% of workers are based at home, above the national 14.0%, and the average commute runs about 35 minutes each way.
High housing values reframe the income picture in Diamond Bar — even solid earnings stretch less against home prices and rents at this level.
Diamond Bar city Population History (2010-2024)
The city of Diamond Bar city had a population of 55,588 in 2010 and 52,292 in 2024, a -5.9% growth over 14 years. The peak was 56,581 in 2016. Average annual growth rate: -0.43%.
52,292
Population (2024)
55,588
Population (2010)
56,581
Peak (2016)
-0.43%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 55,588 |
| 2011 | 55,854 |
| 2012 | 56,087 |
| 2013 | 56,233 |
| 2014 | 56,279 |
| 2015 | 56,429 |
| 2016 | 56,581 |
| 2017 | 56,334 |
| 2018 | 56,106 |
| 2019 | 55,720 |
| 2020 | 55,010 |
| 2021 | 53,839 |
| 2022 | 53,035 |
| 2023 | 52,530 |
| 2024 | 52,292 |
Race & Ethnicity
| White | 17.4% |
| Black or African American | 3.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.1% |
| Two or More Races | 0.0% |
Economy & Income
$106,602
Median Household Income
$47,919
Per Capita Income
6.9%
Poverty Rate
3.1%
Unemployment Rate
Housing
$867,000
Median Home Value
$2,422
Median Rent
77.4%
Owner-Occupied
Education
92.8%
High School+
52.7%
Bachelor's+
Commute
1.4%
Drive Alone
71.9%
Public Transit
16.5%
Work From Home
34.7 min
Avg Commute
Community Profile
7.6%
Foreign Born
38.3%
Non-English at Home
3.1%
Veterans
8.5%
With Disability
96.3%
Health Insurance
98.3%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 22.5% |
| Finance, Insurance & Real Estate | 13.2% |
| Manufacturing | 9.5% |
| Education, Health Care & Social Services | 8.9% |
| Information | 8.7% |
| Retail Trade | 6.8% |
| Public Administration | 5.2% |
| Construction | 3.3% |
| Arts, Entertainment & Food Services | 3.1% |
| Transportation & Warehousing | 1.4% |
| Agriculture & Mining | 0.3% |
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Frequently Asked Questions
Diamond Bar, California has a population of 53,750 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 174th-largest city in California.
The median household income in Diamond Bar, California is $106,602, with 6.9% of residents living below the federal poverty level.
The median home value in Diamond Bar, California is $867,000, with median monthly rent at $2,422 and a homeownership rate of 77.4%.
The median age in Diamond Bar, California is 45.6 years. The population is 46.5% male and 53.5% female.
The population has declined 5.9% since 2010 (55,588 → 52,292).
Where to stay in Diamond Bar
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.