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).
Diamond Bar city, CA Climate
Diamond Bar city, CA has an average annual temperature of 17.8°C (64°F) and receives about 426 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
17.8°C
Avg Temp
426
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 12° / 54° | 88 mm |
| February | 13° / 56° | 91 mm |
| March | 14° / 57° | 78 mm |
| April | 16° / 61° | 30 mm |
| May | 18° / 65° | 5 mm |
| June | 21° / 70° | 1 mm |
| July | 24° / 75° | 1 mm |
| August | 24° / 76° | 3 mm |
| September | 23° / 73° | 9 mm |
| October | 20° / 67° | 12 mm |
| November | 15° / 59° | 49 mm |
| December | 12° / 54° | 59 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Diamond Bar city, CA
The most comfortable months to visit Diamond Bar city, CA are typically June, October and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 32°C high). The coldest is January (near 6°C low). February is usually the wettest month.
Where to stay near Diamond Bar
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.