Diamond Bar, CA · standard
ZIP Code 91765
Los Angeles County, California - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 46,457
- 948/sq mi High-density area
- $105,565
- Median income Above-median income area
- $915,100
- Median home value Above-median home value
- 53.7%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
Diamond Bar pairs an upper-quartile household income with top-decile home values, in a low-density, homeowner-dominated area.
- Top 16%
- household income, US ZIPs
- Top 3%
- home value, US ZIPs
- 948
- people per sq mi
- 78%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 91765 against every reporting US ZIP.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 91765 (Diamond Bar, CA) rose +4.5% from 2023 to 2024. The all-transactions index moved from 357.0 in 2023 to 373.0 in 2024 (2000 = 100).
ZIP code 91765 is a densely settled ZIP (a standard USPS delivery area) in Diamond Bar, Los Angeles County, California, with 46,457 residents across 49.0 square miles, a density of 948 people per square mile, in the Los Angeles time zone.
ZIP 91765 lands in the middle-income range, with a median household income of $105,565 (4% above the average California ZIP), while per-capita income is $48,949. The poverty rate is 10.7%, with unemployment at 5.0%; those measures add context to the income figure. Housing is both higher-cost and owner-heavy: median home value is $915,100 (18% above the average California ZIP), while 77.5% of occupied homes are owner-occupied and median rent is $2,486.
This is a highly-educated ZIP: 53.7% of adults hold a bachelor's degree or higher, the median age is 46, and the average commute is 33 minutes. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Los Angeles County, so 91765 can be compared with both its immediate and county-level context.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Top industries in ZIP 91765
Top 5 sectors by establishment count in Diamond Bar, CA
Which industries have the most business establishments in ZIP 91765.
- Professional, scientific, and technical services
Professional, scientific, and technical services
301 establishments
- Wholesale trade
Wholesale trade
231 establishments
- Health care and social assistance
Health care and social assistance
223 establishments
- Transportation and warehousing
Transportation and warehousing
181 establishments
- Real estate and rental and leasing
Real estate and rental and leasing
162 establishments
What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 91765, Diamond Bar, CA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.
Quick Facts
46,457
Population
49.0
Area (sq mi)
948
People / sq mi
Los Angeles
Time Zone
standard
ZIP Type
Who lives in ZIP 91765?
46.0
Median Age
47.7%
Male
52.3%
Female
47.5%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$105,565
Median Household Income
+4% vs state ZIP avg
$48,949
Per Capita Income
10.7%
Poverty Rate
5.0%
Unemployment Rate
33.1 min
Mean Commute Time
How ZIP 91765 ranks nationally
Diamond Bar, CA household income vs. every US ZIP code
Median household income, the full national distribution, with this ZIP marked
$105,565 Top 16% higher than 84% of 30,318 US ZIPs
Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
16,078housing units
16,078
Total Housing Units
15,233
Occupied Units
845
Vacant Units
2.91
Avg Household Size
Occupancy Type
$915,100
Median Home Value
+18% vs state ZIP avg
$2,486
Median Rent
1980
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
+4.5%
YoY Change (2024)
373
HPI Index (2000 = 100)
+273%
Total Change Since 2000
Home values in ZIP 91765 have increased 4.5% over the past year (2024). Since 2000, this ZIP has seen +273% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +0.6% | 257 |
| 2021 | +10.7% | 285 |
| 2022 | +16.6% | 332 |
| 2023 | +7.6% | 357 |
| 2024 | +4.5% | 373 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 1,793 business establishments in ZIP 91765, employing approximately 11,381 people with a combined annual payroll of $690,770,000.
1,793
Businesses
11,381
Employees
$690.8M
Annual Payroll
16
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Professional, scientific, and technical services | 301 | 16.8% |
| Wholesale trade | 231 | 12.9% |
| Health care and social assistance | 223 | 12.4% |
| Transportation and warehousing | 181 | 10.1% |
| Real estate and rental and leasing | 162 | 9.0% |
| Accommodation and food services | 120 | 6.7% |
| Retail trade | 118 | 6.6% |
| Finance and insurance | 110 | 6.1% |
| Other services (except public administration) | 90 | 5.0% |
| Construction | 81 | 4.5% |
| Administrative and support and waste management and remediation services | 63 | 3.5% |
| Educational services | 49 | 2.7% |
| Information | 21 | 1.2% |
| Arts, entertainment, and recreation | 19 | 1.1% |
| Manufacturing | 17 | 0.9% |
| Management of companies and enterprises | 4 | 0.2% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 91765 vs 92823 →
ZIP 91765 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 91709
Chino Hills (91709)
74,796 residents
- 91766
Pomona (91766)
71,599 residents
- 92886
Yorba Linda (92886)
46,564 residents
- 91765
Diamond Bar (91765)
46,457 residents
- 91748
Rowland Heights (91748)
45,406 residents
- 91789
Walnut (91789)
43,079 residents
- 92821
Brea (92821)
35,533 residents
- 91768
Pomona (91768)
34,537 residents
- 91773
San Dimas (91773)
33,119 residents
What this shows Among its immediate neighbors, ZIP 91765 ranks #4 by population - useful context the national average alone can't give.
ZIP 91765 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 92823
Brea (92823)
$169,900 median income
- 92886
Yorba Linda (92886)
$153,397 median income
- 91709
Chino Hills (91709)
$126,350 median income
- 91789
Walnut (91789)
$125,720 median income
- 92821
Brea (92821)
$123,629 median income
- 91765
Diamond Bar (91765)
$105,565 median income
- 91773
San Dimas (91773)
$105,338 median income
- 91792
West Covina (91792)
$94,817 median income
- 91748
Rowland Heights (91748)
$83,428 median income
What this shows By household income, ZIP 91765 ranks #6 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 92823 | Brea, CA | 3,613 | 4.1 mi |
| 91789 | Walnut, CA | 43,079 | 3.1 mi |
| 91748 | Rowland Heights, CA | 45,406 | 4.9 mi |
| 91768 | Pomona, CA | 34,537 | 5.4 mi |
| 91709 | Chino Hills, CA | 74,796 | 4.8 mi |
| 92886 | Yorba Linda, CA | 46,564 | 6.4 mi |
| 91766 | Pomona, CA | 71,599 | 5.0 mi |
| 91792 | West Covina, CA | 30,854 | 5.5 mi |
| 91773 | San Dimas, CA | 33,119 | 8.4 mi |
| 92821 | Brea, CA | 35,533 | 5.8 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 91765, both outside CA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (46,457 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Los Angeles County
Related Areas
Frequently Asked Questions
What county is ZIP code 91765 in?
ZIP code 91765 (Diamond Bar) is located in Los Angeles County, California. Los Angeles County contains multiple ZIP codes, see the full list at /counties/los-angeles-ca.
What is the population of ZIP code 91765?
ZIP code 91765 in Diamond Bar, CA has a population of 46,457 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 91765?
The median household income in ZIP 91765 is $105,565, which is 38% above the national average of $76,288.
What is the average home value in ZIP 91765?
The median home value in ZIP 91765 is $915,100, which is 229% above the national average of $278,155.
What is the demographic makeup of ZIP 91765?
The largest racial group in ZIP 91765 is Asian at 62.2%. Hispanic or Latino residents make up 17.3% of the population.
How many businesses are in ZIP code 91765?
ZIP code 91765 has 1,793 business establishments employing approximately 11,381 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 91765?
The top industries by establishment count in ZIP 91765 are: Professional, scientific, and technical services (301), Wholesale trade (231), Health care and social assistance (223). There are 16 industry sectors represented in total.
How have home values changed in ZIP code 91765?
According to the FHFA House Price Index, home values in ZIP 91765 increased by 4.5% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 273%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 91765?
In ZIP code 91765, 67.5% of residents aged 25+ have a high school diploma or higher, and 53.7% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 91765?
The mean commute time for workers in ZIP code 91765 is 33.1 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend more time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 91765?
In ZIP code 91765, approximately 77.5% of occupied housing units are owner-occupied and 22.5% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 91765?
The poverty rate in ZIP code 91765 is 10.7% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 91765's numbers, next.
- See how ZIP 91765 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Diamond Bar, CA ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
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ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.