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
- $105,565
- Median income
- $915,100
- Median home value
- 53.7%
- Bachelor's or higher
The verdict
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.
ZIP code 91765 is classified by USPS as a standard delivery area and covers roughly 49.0 square miles in Diamond Bar, Los Angeles County, California. The area is home to 46,457 residents, producing a population density of 948 people per square mile, and falls within the Los Angeles time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 91765 against California and the nation.
On the economic side, the median household income for ZIP 91765 sits at $105,565 (4% above the California average), while per-capita income is $48,949. The poverty rate stands at 10.7% and the unemployment rate at 5.0%. On housing, the median home value is $915,100 (18% above the state average) with median rent at $2,486 per month, and 77.5% of occupied units are owner-occupied, a direct signal of whether 91765 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 53.7% of adults hold a bachelor's degree or higher, the median age is 46, and the average commute is 33 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Los Angeles County, so you can benchmark 91765 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →
Top industries in ZIP 91765
Top 5 sectors by establishment count
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 + HUD FMR + FHFA HPI ACS demographics, ZBP business establishments, HUD Fair Market Rents, 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; HUD FMR + 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
$48,949
Per Capita Income
10.7%
Poverty Rate
5.0%
Unemployment Rate
33.1 min
Mean Commute Time
How ZIP 91765 ranks nationally
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?
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
$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 |
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Frequently Asked Questions
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What percentage of residents own vs. rent in ZIP 91765? ▼
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ZIP Code Research Guides
Official Data Resources for Diamond Bar, CA
Verify and explore additional data for this area using these official government sources.
Read our methodology to see how this data is sourced, computed, and verified.