All ZIP Codes, Map and Demographics of Diamond Bar, CA

91765 & 91789 are the only ZIP Codes for Diamond Bar, CA

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Data Last Updated: March 1, 2026
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ZIP Codes:91765 & 91789 [See All]
County:Los Angeles County, CA
Area Codes:840,909
Time Zone:Pacific (GMT -08:00)
Local Time:12:00:00 AM
Population:55,072 (Census Place) [More Demographics]
Statistical Area:Los Angeles-Long Beach-Anaheim, CA [Learn More]
Coordinates:33.9977, -117.8132
Land Area:34.44 sq miles (ZIP Codes)
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Diamond Bar, CA has 2 ZIP Codes


ZIP CodeTypePopulationPop% of Population% of PopAlias Names
91765Standard46,44952.97%Pomona
91789Standard41,23547.03%City Industry,City Of Industry,Diamond Bar
157,923 people in Pomona, CA — get this data and hundreds of fields for every U.S. ZIP code View Database Try API
Interactive charts load automatically as you scroll. Hover for data, click to explore trends, and use the menu to export.

Population & Demographics


Diamond Bar, CA has 85,712 residents, with an average household size of 2.9. The gender split is 46.5% male and 53.5% female - about the same as the national split. By age, the top brackets are 30-34 (8.4%) and 35-39 (7.5%). By race, White and Asian are the largest groups. Hispanic or Latino (of any race) is 17.0%. Those born outside the United States make up 46.8% (higher than the Nation).

Explore More: Population Over Time By Age & Gender By Race By Gender Nativity & Citizenship

Source: U.S. Census 2020 Demographics & Housing Characteristics (DHC) and U.S. Census 2011-2024 American Community Survey (ACS) 5-Year Estimates.

There are two kinds of demographics shown in the charts for Diamond Bar, CA. Each covers a different geographic boundary and has different criteria for what is included. Learn More

Total Population:46,449
Total Households:15,404
Total Housing Units:29,486
Average Household Size:3.07
Average Family Size:3.04

All ZIP Codes assigned this City name by the USPS.

Total Population:55,072
Total Households:18,173
Total Housing Units:18,819
Average Household Size:3.02
Average Family Size:3.02

Data for the U.S. Census Place.

Population Over Time (with 2010 & 2020 Census Benchmarks)


Line chart of All ZIPs in Diamond Bar, CA population estimates from 2011-2024, with markers for the 2010 and 2020 Decennial Census counts to show growth or decline over time. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Group20102011210220132014201520162017201820192020202120222023
Census ACS Population Estimate--89,30989,76589,88290,93191,40391,46691,51391,61391,03389,77988,09986,68085,712
Decennial Census89,536------------------87,684------
Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

Population by Age & Gender (Total, Male, Female)


Median Age: 43.8

Male Median Age: 41.8

Female Median Age: 45.4

Line Chart showing the population by Age Group and Gender of all ZIPs in Diamond Bar, California. One line shows the Total population in that age group, another line shows the Male population for that age group, and the last line shows the Female population for the given age group. A table also provides the same information. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Group< 55-910-1415-1920-2425-2930-3435-3940-4445-4950-5455-5960-6465-6970-7475-7980-8485+
Male1,7002,1782,5322,9153,0452,8522,5042,4342,4142,6773,0113,0803,2372,8622,3971,408816587
Female1,5882,0512,3302,6302,6892,6382,4002,4972,7383,2043,4023,5983,7033,3642,6411,634987941
Total3,2884,2294,8625,5455,7345,4904,9044,9315,1525,8816,4136,6786,9406,2265,0383,0421,8031,528
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Population by Race


Pie Chart showing Population by Race for all ZIPs in Diamond Bar, California. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
White:8,85917.47%
Black:1,6643.28%
Hispanic:*9,08417.91%
Asian:27,25953.75%
American Indian:2660.52%
Hawaiian:800.16%
Other:3,5056.91%
Total:50,717100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
* NOTE: Hispanic or Latino is an ethnicity, not a race. This means individuals who identify as Hispanic will also be included in one of the race categories (such as White or Black). As a result, the totals shown here may exceed 100% when Hispanic is displayed alongside racial groups.

Gender Breakdown


Pie chart showing Male vs Demale share of the population. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
GenderCountPercentageMedian Age
Males:22,56648.58%41.8 years
Females:23,88351.42%45.4 years
Total:46,449100%43.8 years

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Nativity & Citizenship


Native, born in the United States:43,00150.17%
Native, born in PR, Island Areas, or abroad:1,2301.44%
Foreign born, naturalized U.S. citizen:29,51734.44%
Foreign born, not a U.S. citizen:11,96448.40%
Total Population:85,712100%
Total Native Population:44,23151.60%
Total Foreign-born Population:41,48148.40%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS
Note: Nativity and Citizenship derived from American Community Survey (ACS) 5-year estimates. Total Population listed here will not match official ZIP Code population totals, which are based on the Decennial Census.

Income & Employment


ZIP Codes in Diamond Bar, CA have an average household income of $115,239 (higher than the State by 19.6%, and much higher than the Nation by 46.7%). Family vs nonfamily earnings show a significant gap ($129,116 vs $50,968). Employment participation is lower than the Nation (63.3%). The unemployment rate is 5.1%, which is about the same as the Nation (5.2%).

Explore More: Income Over Time Household Income Employment Status By Occupation

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02, DP03, DP04 and DP05.

Median Income Over Time (Household, Family, Nonfamily, Male, Female)


Line Chart showing Median Income Estimates from 2011 until 2024 of Median Household Income, Median Family Income, Median Nonfamily Income, Median Male Income, and Median Female Income for all ZIPs in Diamond Bar, California. A table also provides the same information. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Income Type2011210220132014201520162017201820192020202120222023
Median Household Income$91,632$91,288$90,221$92,237$91,911$91,960$95,183$98,683$101,160$103,504$108,144$114,633$115,239
Median Family Income$99,924$99,530$97,671$98,883$98,736$99,425$103,954$106,199$109,453$114,052$117,445$124,923$129,116
Median NonFamily Income$50,401$51,523$54,196$53,350$47,997$48,028$48,889$53,722$56,423$51,511$53,705$55,187$50,968
Median Male Income$62,653$63,299$63,465$62,842$62,319$61,921$63,478$65,157$67,619$67,651$71,532$76,850$79,779
Median Female Income$47,138$49,261$49,681$51,482$51,658$51,756$53,684$53,838$53,681$52,882$59,258$67,841$70,904
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income


Bar Chart showing Average Household Income for all ZIPs in Diamond Bar, CA, the U.S. Census Place, Los Angeles County, the state of California, and the United States National Average. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Source: U.S. Census 2019-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment Status


Employment status for all ZIPs in Diamond Bar, CA: employed, unemployed, and not in the labor force. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Employed:41,20157.78%
Unemployed:2,0892.93%
Not In Labor Force:28,01739.29%
Total:71,307100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment by Occupation (Civilian Employed Population, 16 and Over)


Management, business, science, and arts:22,29054.10%
Service:5,11112.41%
Sales and Office:9,40822.83%
Natural resources, construction, and maintenance:1,3493.27%
Production, transportation, and material moving:3,0437.39%
Total Civilian Employed Population:41,201100%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS.

Housing & Affordability


In Diamond Bar, CA, the median home value is $878,900 - much higher than the State by 26.4%, and up $183,000 (26.3%) since 2020. Renters pay an average of $2,395 per month - much higher than the State by 22.4%, and up $332 (16.1%) since 2020. Most renters in Diamond Bar pay $2,000+ (78.6%). About 1.9% pay under $1,000 and 78.6% pay $2,000+; the under $1,000 share is much lower than the Nation. Of occupied housing, owners make up 77.4% (62.3% have a mortgage) and renters make up 22.6% - owners are much higher than the Nation.

Explore More: Compare Home Value Home Value Over Time Rent & Over Time Housing Occupancy

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Table DP03, SELECTED ECONOMIC CHARACTERISTICS.

Median Home Value (Comparison)


Bar Chart showing median House Value for all ZIPs in Diamond Bar, California, the U.S. Census Place, Los Angeles County, California, and the United States National Average. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Median Home Value Over Time (2011-2024)


Group2011210220132014201520162017201820192020202120222023
Median Home Value$550,100$533,400$525,400$539,000$568,100$596,700$617,900$643,200$668,600$695,900$709,800$839,700$878,900
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Gross Rent Paid


Less than $500:220.38%
$500 to $999:490.85%
$1,000 to $1,499:3716.45%
$1,500 to $1,999:4507.83%
$2,000 to $2,499:1,56027.14%
$2,500 to $2,999:93716.30%
$3,000 or more:1,68029.23%
No Rent:67911.81%
Total:5,748100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Gross Rent Over Time (2011-2024)


Group2011210220132014201520162017201820192020202120222023
Median Rent$1,747$1,740$1,762$1,811$1,808$1,841$1,916$1,952$2,021$2,063$2,193$2,310$2,395
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Housing Occupancy


Owner Occupied (with mortgage): 13,708 48.72%
Owner Occupied (free and clear, no mortgage): 8,680 30.85%
Renter Occupied: 5,748 20.43%
Total Occupied Housing Units: 28,136 100%

Occupied Housing Units: 28,136 95.24%
Vacant Housing Units (not graphed): 1,406 4.76%
Total Housing Units: 29,542 100%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Education, Health & Community


52.7% of adults (25+) have a bachelor-s degree or higher, well above the state rate (36.5%) and well above the national average (35.0%). High school or higher is 92.8%, which is well above the state rate (84.6%). The share of people in poverty is 7.8%, which is about the same as the state rate (8.4%) and about the same as the national rate (8.7%), up 4.1 percentage points since 2011 and up 3.0 percentage points from its 2019 pre-pandemic level.

Explore More: Educational Attainment Health Insurance Poverty Over Time School Enrollment

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02 and DP03.

Educational Attainment of Adults (25 and Older)


Less than 9th grade:2,3903.75%
9th to 12th grade, no diploma:1,9893.12%
High school graduate (includes equivalency):9,65315.13%
Some college, no degree:10,20816.00%
Associate's degree:5,5848.75%
Bachelor's degree:22,39035.09%
Graduate or professional degree:11,59018.17%
Total:63,804100%
High school graduate or higher:59,42593.14%
Bachelor's degree or higher:33,98053.26%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Health Insurance Coverage by Type (Private, Public, Uninsured)


Private Insurance:60,10164.28%
Public Insurance:29,84831.92%
No Insurance:3,5473.79%
Total:93,496100%
Has Health Insurance:89,94996.21%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Percentage of People in Poverty Over Time (2011-2024)


Group2011210220132014201520162017201820192020202120222023
% of People in Poverty3.7%3.4%4.7%4.8%5.3%4.4%4.6%4.5%4.8%5.5%6.7%7.3%7.8%
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.

School Enrollment by Education Level (Ages 3 and Older)


Nursery School, Preschool:9584.54%
Kindergarten:1,2145.75%
Elementary school (grades 1-8):7,54835.74%
High school (grades 9-12):3,84718.22%
College or graduate school:7,55135.76%
Total:21,118100%
Early Childhood:2,17210.29%
K-12 (Primary & Secondary School):12,60959.71%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Business & Employment Statistics


Diamond Bar supports both business and residential activity. According to the Business Census (2024), there are 1,793 business establishments, employing about 11,381 people with an annual payroll of $690,770,000. USPS data shows 15,814 residential mailboxes and 997 business mailboxes, reflecting local delivery coverage.

# Residential Mailboxes:15,814Source: USPS
# Business Mailboxes:997Source: USPS
Total Delivery Receptacles:23,287Source: USPS
Single Family Delivery Units:11,479Source: USPS
Multi Family Delivery Units:1,700Source: USPS
# of Businesses:1,793Source: CBP
1st Quarter Payroll:$170,983,000Source: CBP
Annual Payroll:$690,770,000Source: CBP
# of Employees:11,381Source: CBP

All ZIP Codes assigned this City name by the USPS.

Geography, Land Area, and Statistical Classifications


Diamond Bar, CA is located in Los Angeles County, within the Los Angeles-Long Beach-Anaheim, CA Metropolitan Statistical Area (CBSA 31080) and California's 1st Congressional District. This Metro area has a population of 13,012,469 people, about 0.7% of whom live in Diamond Bar. ZIP Codes here cover 34.435 sq mi of land and a water area of 0.056 sq mi.

CBSA Name:Los Angeles-Long Beach-Anaheim, CASource: Census
CBSA Number:31080Source: Census
CBSA Type:MetroSource: Census
CBSA Division:--Source: Census
CBSA Population:13,012,469Source: Census
MSA:Los Angeles-Riverside-Orange County, CASource: Census
PMSA:Los Angeles-Long Beach, CA PMSASource: Census
Land Area:34.435 sq miSource: Census
Water Area:0.056 sq miSource: Census
Congressional District(s):38Source: USPS
Intro Date:< 2004-10Source: ZIP-Codes.com
Place FIPS Code:19192Source: Census
Place Name:Diamond Bar city; CaliforniaSource: Census

Sum of all ZIP Codes assigned this City name by the USPS.

Adjacent & Nearby Cities from Diamond Bar, CA


  1. Walnut, CA ~2.6 miles
  2. Pomona, CA ~4.1 miles
  3. Brea, CA ~5.0 miles
  4. West Covina, CA ~5.2 miles
  5. Rowland Heights, CA ~5.3 miles
  6. Chino Hills, CA ~6.0 miles
  7. Covina, CA ~6.0 miles
  8. La Puente, CA ~7.2 miles
  9. Yorba Linda, CA ~7.4 miles
  10. San Dimas, CA ~8.1 miles
  11. Montclair, CA ~8.2 miles
  12. Chino, CA ~8.3 miles
  13. Placentia, CA ~8.3 miles
  14. Fullerton, CA ~8.4 miles
  15. Glendora, CA ~8.5 miles
  16. La Habra, CA ~9.1 miles
  17. Hacienda Heights, CA ~9.8 miles
  18. Anaheim, CA ~10.2 miles
  19. Claremont, CA ~10.3 miles
  20. Ontario, CA ~10.4 miles

Sources & References


Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on March 1, 2026.

  1. U.S. Postal Service [Last Updated: 3/1/2026], https://www.usps.com
  2. ZIP-Codes.com Proprietary Data Enhancements [Updated: 3/1/2026], https://www.zip-codes.com
  3. U.S. Census [Updated: Varies], https://www.census.gov
    • U.S. Census Office of Management and Budget [Updated: As Released]
    • U.S. Census 2020 Demographic & Housing Characteristics (DHC) [Decennial] [Updated: 5/25/2023]
    • U.S. Census 2011-2024 American Community Survey 5-year estimates (ACS) [Annually] [Updated: Annually, As Released]
    • U.S. Census Business Patterns [Annually] [Updated: Annually, As Released]
    • U.S. Census American National Standards Institute (ANSI) [Updated: As Released]
  4. U.S. Geological Survey [Updated: Varies], https://www.usgs.gov
  5. Centers for Medicare & Medicaid Services [Updated: Annually, As Released], https://www.cms.gov
  6. National Center for Education Statistics [Updated: 3/1/2026], https://nces.ed.gov