Diamond Bar, CA demographics:
population, income, and more

Total population
53,355
-0.7% year-over-year change
Median household income
$108,281/yr
1.6% year-over-year change
Housing units
18,969
-0.2% year-over-year change

Diamond Bar population

How many people live in Diamond Bar

Diamond Bar is home to 53,355 residents, according to the most recent Census data. Gender-wise, 47.5% of Diamond Bar locals are male, and 52.5% are female.

Total population
53,355
-0.7% year-over-year change
Gender ratio
Male
47.5%
25,324
Female
52.5%
28,031
Value Percent YoY change
Male 25,324 47.5% 1.3%
Female 28,031 52.5% -2.5%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Diamond Bar is 46, with the population distributed as follows: about 15.1% are children under 15, then 10.3% are in the 15 to 24 age group. Adults between 25 and 44 make up 23.3% of the population, while another 30.2% fall into the 45 to 64 bracket. Finally, around 21% are 65 or older.

Median age
45.7
Age breakdown
Under 15
15.1%
15 to 24
10.3%
25 to 44
23.3%
45 to 64
30.2%
Over 65
21%
Value Percent YoY change
Under 15 8,061 15.1% -1.7%
15 to 24 5,518 10.3% 2.2%
25 to 44 12,428 23.3% -1.6%
45 to 64 16,131 30.2% -3.4%
Over 65 11,217 21% 3.6%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Diamond Bar, 51.4% of the population are US-born citizens, while 34.4% have gained naturalized citizenship. At the same time, 14.2% of residents are non-citizens. As for race, 14.6% of locals are Caucasian, 3.1% are African American and 62.7% have Asian roots. Another 0.8% are Indigenous American, 0.3% are Pacific Islanders, while 7.1% identify as another race. There’s also a share of 11.4% that includes residents with two or more races.

Citizenship
U.S.-born citizens
51.4%
Non-U.S.-born citizens
34.4%
Non-citizens
14.2%
Value Percent YoY change
U.S.-born citizens 27,429 51.4% -1.4%
Non-U.S.-born citizens 18,348 34.4% -2.2%
Non-citizens 7,578 14.2% 5.6%
Racial breakdown
White
14.6%
Black or African American
3.1%
American Indian and Alaska Native
0.8%
Asian
62.7%
Native Hawaiian and other Pacific Islander
0.3%
Two or more races
11.4%
Other
7.1%
Value Percent
White 7,766 14.6%
Black or African American 1,654 3.1%
American Indian and Alaska Native 455 0.8%
Asian 33,452 62.7%
Native Hawaiian and other Pacific Islander 155 0.3%
Two or more races 6,065 11.4%
Other 3,808 7.1%

Households in Diamond Bar

A peek inside Diamond Bar households

Diamond Bar has 18,005 households, with an average of 3 members in each. Of these, 79.6% are families, while the remaining 20.4% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
18,005
-1.3% year-over-year change
Average people per household
3
Non-family households
3,682
Family households
14,323
Value Percent YoY change
Non-family households 3,682 20.4% 0.1%
Family households 14,323 79.6% -1.6%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Diamond Bar

The housing landscape of Diamond Bar

Diamond Bar's housing consists of 18,969 units, with 69.7% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 12.2% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 1.9% of the housing landscape.

Housing units
18,969
-0.2% year-over-year change
Housing types
Value Percent
1 unit, detached 13,216 69.7%
1 unit, attached 2,321 12.2%
2 units 121 0.6%
3 or 4 units 1,027 5.4%
5 to 9 units 543 2.9%
10 to 19 units 351 1.8%
20 to 49 units 222 1.2%
50 or more units 800 4.2%
Mobile home 368 1.9%
Homes built since 2020
23
% year-over-year change

The age of buildings in Diamond Bar

In Diamond Bar, the median construction year is 1980. About 0.6% of homes were built before the 1940s, with another 0.5% going up by 1949. Most development happened in the second half of the 20th century. Then, 3% of homes were added from 2000 to 2009, 1.4% between 2010 and 2019, and 0.1% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 111 0.6% 0.0%
Built between 1940 and 1949 98 0.5% 24.1%
Built between 1950 and 1959 533 2.8% 4.9%
Built between 1960 and 1969 3,268 17.2% -2.9%
Built between 1970 and 1979 5,413 28.5% -6.3%
Built between 1980 and 1989 7,909 41.7% 3.9%
Built between 1990 and 1999 783 4.1% 6.0%
Built between 2000 and 2009 574 3% 5.5%
Built between 2010 and 2019 257 1.4% -2.3%
Built in 2020 or later 23 0.1% N/A
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Diamond Bar occupancy rates

Out of the 18,005 occupied housing units in Diamond Bar, 77.3% are owner-occupied, while 22.7% are lived in by tenants. Meanwhile, 5.1% of all homes on the local market sit vacant.

Occupied housing units
18,005
-1.3% year-over-year change
Occupancy breakdown
Renter occupied
4,088
Owner occupied
13,917
Value Percent YoY
change
Renter occupied 4,088 22.7% -0.7%
Owner occupied 13,917 77.3% -1.4%
Unoccupied housing units
5.1%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Diamond Bar housing costs

Housing costs in Diamond Bar come to a median of $2,339 per month, while tenants specifically pay a median gross rent of $2,521.

Median housing costs per month
$2,339/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Diamond Bar
$2,521/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Diamond Bar

Diamond Bar education at a glance

About 18.6% of the population in Diamond Bar went to high school, while 18.7% pursued college studies. Another 8.4% earned an associate degree and 32.6% hold a bachelor’s. Meanwhile, 17.8% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 1,666 3.8% 3.9%
High school diploma 8,053 18.6% -0.5%
College diploma 8,093 18.7% -2.1%
Associate degree 3,640 8.4% -1.5%
Bachelor's degree 14,074 32.6% -2.6%
Graduate degree 7,703 17.8% 3.4%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Diamond Bar

How much people earn in Diamond Bar

The average annual household income in Diamond Bar was $138,466 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +0.9% change from the previous year. At the same time, the median income stood at $108,281, reflecting a +1.6% shift over the same period.

Average household income in Diamond Bar
$138,466/year
0.9% year-over-year change
Median household income in Diamond Bar
$108,281/year
1.6% year-over-year change

Diamond Bar income by age

In Diamond Bar, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $107,393. Those with someone between 45 and 64 in charge, often well established professionally, earn $135,204 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $71,023, while those led by someone over 65, many of whom may be retired, have about $75,738 in earnings. Overall, 89.9% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $71,023 13.8%
25 - 44 $107,393 3.8%
45 - 64 $135,204 2.6%
Over 65 $75,738 1.6%
Above poverty level
47,631
Below poverty level
5,342
Value Percent YoY
change
Above poverty level 47,631 89.9% -1.6%
Below poverty level 5,342 10.1% 9.3%

Average renter income in Diamond Bar

To get a better sense of what renters earn on average in Diamond Bar, their median household income was $67,764 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 44.6%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$67,764
Rent-to-income ratio
44.6%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Diamond Bar

Workforce and job types in Diamond Bar

The job market in Diamond Bar is powered by 25,960 working residents, spread across a range of industries and roles. 89.2% of the working population are employed in professional or administrative positions, while 10.8% are in hands-on or service-based jobs. Also, 14.6% run their own businesses, 62.9% are employed by private companies, and 15.3% work in the public sector.

Workforce demographics

Working population
25,960
-2.3% year-over-year change
White collar
23,169
Blue collar
2,791
Value Percent YoY change
White collar 23,169 89.2% -2.9%
Blue collar 2,791 10.8% 2.2%
Employer type
Self employees
14.6%
Private companies
62.9%
Governmental workers
15.3%
Not for profit companies
7.2%
Value Percent YoY change
Self employees 3,799 14.6% -0.4%
Private companies 16,322 62.9% -2.4%
Governmental workers 3,976 15.3% -3.5%
Not for profit companies 1,863 7.2% -2.9%
Unemployment rate
4.9%
-5.9% year-over-year change

Available workforce

The unemployment rate in Diamond Bar stands at 4.9%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Diamond Bar

How people get around in Diamond Bar

Commuting methods vary: 79.2% of residents travel by personal vehicle and 0.4% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 20,107 79.2% -4.1%
Taxicab 25 0.1% -3.9%
Bus or trolleybus 152 0.6% 2.7%
Subway or elevated 67 0.3% N/A
Railroad 39 0.2% -68.8%
Bicycle 66 0.3% -8.3%
Walk 89 0.4% -15.2%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Diamond Bar by zipcode?

Zipcode Population Number of households Median income Average income
91765 44,502 15,233 $105,565 $139,295
91789 40,298 12,681 $125,720 $154,585

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FAQs about Diamond Bar demographics 

What is the total population of Diamond Bar?

Diamond Bar has a total population of 53,355 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -0.7% compared to a year ago.

What is the gender ratio in Diamond Bar?

The gender ratio in Diamond Bar is as follows:
  • 47.5% males (25,324 residents)
  • 52.5% females (28,031 residents)

What is the median age in Diamond Bar?

The median age in Diamond Bar is 45.7.

What is the age distribution of the population in Diamond Bar?

The age distribution in Diamond Bar is as follows:
  • Under 15: 15.1% (8,061 residents)
  • Ages 15-24: 10.3% (5,518 residents)
  • Ages 25-44: 23.3% (12,428 residents)
  • Ages 45-64: 30.2% (16,131 residents)
  • Over 65: 21% (11,217 residents)

What is the racial and ethnic makeup of Diamond Bar?

The racial and ethnic makeup of Diamond Bar is as follows:
  • White: 14.6% (7,766 residents)
  • Black or African American: 3.1% (1,654 residents)
  • American Indian and Alaska Native: 0.8% (455 residents)
  • Asian: 62.7% (33,452 residents)
  • Native Hawaiian and Other Pacific Islander: 0.3% (155 residents)
  • Two or More Races: 11.4% (6,065 residents)
  • Other: 7.1% (3,808 residents)

What percentage of the population in Diamond Bar are U.S.-born citizens?

U.S.-born citizens represent 51.4% of the population in Diamond Bar.

How many housing units are there in Diamond Bar?

There are 18,969 housing units in Diamond Bar, reflecting a -0.2% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Diamond Bar and what is the average household size?

Diamond Bar has a total of 18,005 households, with an average of 3 people in each.

What is the median household income in Diamond Bar?

Diamond Bar has a median household income of $108,281, representing a +1.6% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Diamond Bar?

The employment rate is 95.1% in Diamond Bar, with a workforce of 25,960 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 89.2% (23,169 residents)
  • Blue-collar workers: 10.8% (2,791 residents)

Places of employment:
  • Self-employed: 14.6% (3,799 residents)
  • Private companies: 62.9% (16,322 residents)
  • Governmental workers: 15.3% (3,976 residents)
  • Not-for-profit companies: 7.2% (1,863 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025