Zip Code 91765
Diamond Bar, California — Los Angeles County
📍 ZIP code 91765 is in Diamond Bar, Los Angeles County, California.
ZIP code 91765 is located in Diamond Bar, Los Angeles County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 44,779. The area code for ZIP code 91765 is 805.
Quick Answer
Zip code 91765 is in Diamond Bar, California (Los Angeles County). It has a population of 44,779, median household income of $104,737, and median home value of $878,900.
Population
44,779
Income
$104,737
Home Value
$878,900
Climate
90°F / 43°F
About Zip Code 91765
Zip code 91765 is located in Diamond Bar, California, within Los Angeles County. Home to approximately 44,779 residents, this area sits at an elevation of 985 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 805.
The median household income is $104,737 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $878,900, and the cost of living index is 236 (136% above the national average of 100).
Summers average a high of 90°F while winters drop to 43°F. The area receives about 14 in of rain annually. The zip code covers 18.9 square miles of land area.
Key Statistics
44,779
$104,737
$878,900
Pacific (PST/PDT)
805
985 ft
18.9 sq mi
45.7
16,056
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Compare With Nearby Zip Codes
| Metric | 91765 | 91789 | 92823 | 91748 | 91709 | 91792 |
|---|---|---|---|---|---|---|
| City | Diamond Bar, CA | Walnut, CA | Brea, CA | Rowland Heights, CA | Chino Hills, CA | West Covina, CA |
| Population | 44,779 | 40,933 | 5,141 | 43,137 | 78,200 | 30,921 |
| Median Income | $104,737 | $125,742 | $176,543 | $83,455 | $122,784 | $96,383 |
| Home Value | $878,900 | $936,800 | $1,061,200 | $781,500 | $829,900 | $653,800 |
| Cost of Living | 236 | 250 | 250 | 201 | 229 | 183 |
| Median Age | 45.7 | 46.3 | 39 | 44.7 | 40.7 | 40.5 |
Cost of Living
100 = National Average. Diamond Bar's cost of living is 136% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
8.4x
Demographics
Zip code 91765 has a population of 44,779 people with a median age of 45.7. There are 16,056 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Diamond Bar (91765) population trend from 2010 to 2024
↑ 141.1%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
90°F
43°F
14 in
0 in
Diamond Bar experiences hot summers with average highs around 90°F. Winters are mild with lows averaging 43°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$878,900
Median Household Income
$104,737
With 16,056 housing units across 18.9 square miles, 91765 has a housing density of 850 units per square mile. The home price-to-income ratio is 8.4x.
Location & Geography
Latitude
33.9863°
Longitude
-117.8213°
Land Area
18.9 sq mi
Water Area
0 sq mi
Nearby Zip Codes
Zip codes closest to 91765 (Diamond Bar, CA) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 91765's $104,737. A way to compare Diamond Bar to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 91765 (Diamond Bar, CA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Diamond Bar, California?
Diamond Bar, California uses zip code 91765.
What county is zip code 91765 in?
Zip code 91765 is located in Los Angeles County, California.
What is the population of zip code 91765?
The population of zip code 91765 is 44,779 with a median age of 45.7.
Is 91765 in Diamond Bar, California?
Yes, zip code 91765 is in Diamond Bar, Los Angeles County, California. The area code is 805.
Frequently Asked Questions
What city is zip code 91765 in?
Zip code 91765 is in Diamond Bar, California. It is part of Los Angeles County and uses the Pacific (PST/PDT) timezone.
What is zip code 91765?
Zip code 91765 is a U.S. postal code in Diamond Bar, California (Los Angeles County). It has a population of 44,779 and covers 18.9 square miles.
What is the population of zip code 91765?
The population of zip code 91765 (Diamond Bar, CA) is 44,779 with a median age of 45.7. There are approximately 16,056 housing units in this area.
What is the median income in zip code 91765?
The median household income in zip code 91765 (Diamond Bar, CA) is $104,737 per year. The cost of living index is 236 (100 = national average).
What is the average home price in zip code 91765?
The median home value in zip code 91765 (Diamond Bar, CA) is $878,900. The cost of living index is 236 compared to the national average of 100.
What county is zip code 91765 in?
Zip code 91765 is located in Los Angeles County, California. The primary city is Diamond Bar.
What is the area code for zip code 91765?
Zip code 91765 in Diamond Bar, CA uses area code 805. It is located in the Pacific (PST/PDT) timezone.
Is zip code 91765 a good place to live?
Zip code 91765 (Diamond Bar, CA) has a cost of living index of 236 (100 = national average), a median household income of $104,737, and median home values of $878,900. The median age is 45.7. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 91765?
The cost of living index for zip code 91765 (Diamond Bar, CA) is 236, where 100 represents the national average. This area is above the national average. Median home value: $878,900.
What schools serve zip code 91765?
Zip code 91765 in Diamond Bar, California is served by the local school district of Los Angeles County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.