Diamond Bar ZIP Code List — Los Angeles County, CA

There is one unique ZIP code in Diamond Bar, California and it is 91765. Area code: 909.

ZIP codes

18.57

sq mi land

0.01

sq mi water

909

area code

Diamond Bar, CA ZIP code map

About Diamond Bar, CA

Diamond Bar, California, is a picturesque city located in the eastern region of Los Angeles County. Known for its suburban charm and scenic hills, it offers a blend of residential neighborhoods and commercial areas. The city is also recognized for its family-friendly atmosphere, making it a desirable place to live and raise children.

Location & geography

Situated approximately 30 miles east of downtown Los Angeles, Diamond Bar is surrounded by several neighboring cities, including Walnut to the north, Chino Hills to the east, Industry to the south, and Pomona to the west. The city covers a land area of 37.14 square miles, with a slight water area of 0.01 square miles. The terrain is predominantly hilly, providing residents with beautiful views and numerous outdoor recreational opportunities.

Community & economy

Diamond Bar is characterized by its diverse community, which includes families, professionals, and retirees. The local economy is bolstered by a mix of retail businesses, healthcare services, and light manufacturing industries. Residents enjoy a high quality of life, supported by well-maintained parks, community events, and educational resources.

Transportation

Diamond Bar is conveniently located near several major highways, including the Interstate 57 and the Interstate 60, which provide easy access to the greater Los Angeles area. The city is also served by the Ontario International Airport, located roughly 20 miles away, offering both domestic and international flights. Public transit options, such as buses, are available for commuting within the region.

History

Diamond Bar was incorporated as a city in 1989, although its history dates back to the 1840s when it was originally a cattle ranch. The city's name is derived from the diamond-shaped bar brand used by the cattle ranch owners. Over the years, Diamond Bar has evolved into a thriving suburban community, reflecting California's overall growth and development.

Did you know?

One little-known fact about Diamond Bar is that it was originally established as part of a large cattle ranch and has preserved many of its natural landscapes. Additionally, the city is home to a variety of parks and recreational facilities that promote outdoor activities and community engagement.

ZIP codes for Diamond Bar, CA (1)

ZIP code	City	County	Map
91765	Diamond Bar	Los Angeles	View map

Demographics & statistics

45,303

Population

44.9

Median age

$105,712

Median household income

$46,501

Per capita income

$839,700

Median home value

$2,310

Median monthly rent

77.1%

Home ownership

9.7%

Poverty rate

5.4%

Unemployment

12,308

Housing units

52.4%

Bachelor's or higher

Age distribution

Male Female

930

Under 5

1,008

993

5–9

1,075

1,471

10–14

1,593

1,385

15–19

1,501

968

20–24

1,049

2,620

25–34

2,839

2,526

35–44

2,737

3,302

45–54

3,578

1,978

55–59

2,143

1,432

60–64

1,551

2,625

65–74

2,845

1,019

75–84

1,105

494

85+

536

← Male

Female →

Age summary

Group	Count	%
Under 18	8,805	19.4%
18 and over	36,498	80.6%
65 and over	8,624	19.0%
Median age	44.9 years

Race & ethnicity

Asian 52.6%

White 19.5%

Hispanic or Latino 9.9%

Two or more races 7%

Other race 6.3%

Black or African American 3.6%

American Indian / Alaska Native 0.9%

Native Hawaiian / Pacific Islander 0.1%

Group	Count	%
Asian	26,454	52.6%
White	9,824	19.5%
Hispanic or Latino	4,991	9.9%
Two or more races	3,530	7%
Other race	3,171	6.3%
Black or African American	1,790	3.6%
American Indian / Alaska Native	470	0.9%
Native Hawaiian / Pacific Islander	64	0.1%

Household income

Under $10k 5.7%

$10k–$15k 1.6%

$15k–$25k 4.7%

$25k–$35k 5.7%

$35k–$50k 6.3%

$50k–$75k 13.4%

$75k–$100k 10.7%

$100k–$150k 19.3%

$150k–$200k 12.1%

$200k+ 20.4%

Range	% of households
Under $10k	5.7%
$10k–$15k	1.6%
$15k–$25k	4.7%
$25k–$35k	5.7%
$35k–$50k	6.3%
$50k–$75k	13.4%
$75k–$100k	10.7%
$100k–$150k	19.3%
$150k–$200k	12.1%
$200k+	20.4%
Median income	$105,712

Housing

Home values

Under $50k 0.7%

$50k–$100k 0.4%

$100k–$150k 0.5%

$150k–$200k 0.1%

$200k–$300k 0.4%

$300k–$500k 10.9%

$500k–$1M 61.3%

$1M+ 25.8%

Housing overview

Metric	Value
Median home value	$839,700
Median rent / month	$2,310
Owner occupied	77.1%
Renter occupied	22.9%
Vacant	4.3%
Single-family detached	70.2%
Large apartment buildings	5.7%
Mobile homes	0.1%
Median rooms	6.2
Avg household size (owned)	2.99

Year built

Era	%
2020 or later	0.0%
2010–2019	1.3%
2000–2009	2.6%
1990–1999	4.2%
1980–1989	38.3%
1970–1979	32.7%
1960–1969	17.8%
1950–1959	2.2%
1940–1949	0.4%
1939 or earlier	0.6%

Bedrooms

Size	% of units
No bedroom (studio)	2.7%
1 bedroom	3.6%
2 bedrooms	16.2%
3 bedrooms	27.7%
4 bedrooms	39.6%
5+ bedrooms	10.2%

Vehicles per household

Vehicles	% of households
No vehicle	2.4%
1 vehicle	22.8%
2 vehicles	41.9%
3 or more	32.9%

Heating fuel

Fuel type	%
Utility gas	79.8%
Electricity	17.3%
Propane / LP gas	1.5%
Solar	0.8%
No fuel used	0.7%

Households & families

Household type	Count	%
Married-couple family	9,454	62.7%
Cohabiting couple	440	2.9%
Male householder, no spouse	1,645	10.9%
Female householder, no spouse	3,542	23.5%
Households with children under 18	4,837	32.1%
Households with seniors (65+)	5,943	39.4%
Average household size	2.99

Marital status

Status	Male	Female
Never married	33.3%	26.7%
Married	58.9%	53.5%
Separated	0.3%	1.2%
Widowed	1.7%	9.0%
Divorced	5.7%	9.6%

Education

Less than 9th grade 4.1%

Some HS, no diploma 3.2%

HS graduate 14.0%

Some college, no degree 17.5%

Associate's degree 8.8%

Bachelor's degree 33.7%

Graduate / professional 18.8%

Metric	%
HS diploma or higher	92.7%
Bachelor's or higher	52.4%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	467	4.0%
Kindergarten	383	3.3%
Elementary school	4,190	35.9%
High school	2,221	19.0%
College / grad school	4,401	37.7%

Employment

Industry of employment

Education & healthcare 22.4%

Professional & management 13.5%

Retail trade 11.4%

Finance & real estate 9.3%

Arts, food & hospitality 8.7%

Manufacturing 8.0%

Wholesale trade 6.9%

Transportation & utilities 6.4%

Public administration 4.8%

Construction 3.7%

Other services 3.0%

Information 1.6%

Agriculture & mining 0.3%

Occupation

Category	%
Management, business & arts	53.4%
Service	12.5%
Sales & office	24.5%
Natural resources & construction	3.4%
Production & transportation	6.2%

Employment type

Type	%
Private sector	77.9%
Government	14.1%
Self-employed	7.9%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	74.0%
Carpool	9.1%
Public transit	1.8%
Walk	0.6%
Other means	0.6%
Avg commute (minutes)	34.4

Poverty

All people 9.7%

Under 18 years 10.8%

18 and over 9.4%

Married-couple families 6.0%

Female-led households 14.0%

Income support

Source	% of households
Social Security	33.7%
Retirement income	22.4%
Supplemental Security	4.0%
Cash public assistance	2.3%
Food stamps / SNAP	4.5%

Health indicators

Condition	%
High blood pressure	24.4%
High cholesterol	29.2%
Heart disease	4.0%
Stroke	2.0%
Asthma	7.0%
Arthritis	14.7%
Kidney disease	2.1%
Pulmonary disease	3.4%
Cancer	4.7%

Behavior / access	%
Binge drinking	14.0%
No physical activity	16.0%
Less than 7 hrs sleep	31.1%
Fair or poor health	9.4%
Poor mental health	11.1%
Poor physical health	6.6%
No health insurance	8.4%
Visited doctor (checkup)	65.2%
Visited dentist	69.5%
Cholesterol screening	93.1%
Teeth loss	5.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,028	2.8%

Disability	%
Any disability	8.8%
Under 18	3.8%
18–64 years	5.5%
65 and over	24.7%

Health insurance coverage

Type	%
Private insurance	73.1%
Public insurance	32.4%
Uninsured under 19	3.9%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	43,365	95.7%
Spanish	12,141	28.0%
Other Indo-European	816	1.9%
Asian & Pacific Islander	454	1.0%
Other languages	10,745	24.8%

Place of birth & citizenship

Origin	Count	%
Native born (US)	25,016	55.2%
Born in same state	24,427	53.9%
Born in different state	20,712	45.7%
Foreign born	589	1.3%
Naturalized citizen	20,287	44.8%
Not a US citizen	14,412	71.0%

Ancestry

Ancestry	Count	%
French	1,020	2.3%
Italian	961	2.1%
Arab	504	1.1%
Polish	212	0.5%

Ancestry	Count	%
English	150	0.3%
German	91	0.2%
Norwegian	12	0%
Dutch	8	0%

Technology access

Metric	% of households
Computer access	33.3%
Internet access	98.2%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What is the ZIP code for Diamond Bar, CA?

Diamond Bar, CA has one ZIP code: 91765.

What is the main ZIP code for Diamond Bar, CA?

The primary ZIP code for Diamond Bar, CA is 91765. The city uses area code 909 for phone service.

What county is Diamond Bar, CA in?

Diamond Bar is located in Los Angeles County, California.

How many ZIP codes are in Diamond Bar, CA?

Diamond Bar, CA has 1 ZIP code.

What is the ZIP code for Diamond Bar's central commercial district along Diamond Bar Boulevard?

The main commercial areas along Diamond Bar Boulevard, including the Diamond Bar Town Center and surrounding retail districts, are located in ZIP code 91765.

What ZIP code covers the residential neighborhoods near Diamond Bar High School?

Diamond Bar High School and the surrounding residential neighborhoods in the central part of the city are all within ZIP code 91765.