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US ZIP Code Profile

ZIP Code 91765
Diamond Bar, California

ZIP code 91765 is in Diamond Bar, located in Los Angeles County, California, within the Los Angeles-Long Beach-Anaheim metro area. Its 2020 Census population was 46,449. The estimated median adjusted gross income per tax return is $63,462, and about 12% of filers report $200,000 or more.

2020 Population
46,449
Census ZCTA
County
Los Angeles
FIPS 06037
Median income (est.)
$63,462
IRS SOI 2022
Land Area
18.92 mi²
+ 0.005 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityDiamond Bar, CA
CountyLos Angeles County (FIPS 06037)
StateCalifornia (FIPS 06)
Metro Area (MSA)Los Angeles-Long Beach-Anaheim, CA Metro Area (31080)
Census Region / DivisionWest Region · Pacific Division
Coordinates33.98627, -117.82128
Land / Water Area18.92 mi² land · 0.005 mi² water

02Income & Economics

Distribution of the 22,800 individual tax returns filed in 91765 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
24.4%
$25K–$50K
18.2%
$50K–$75K
13.7%
$75K–$100K
10.5%
$100K–$200K
21.4%
$200K+
11.8%
The $200,000+ bracket accounts for 48% of 91765's total adjusted gross income, from 12% of returns — a concentration that drives the gap between the median ($63,462) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 91765's IRS income metrics, 2020–2022.

Median income (2021→2022)
$63,462
▲ 4.3%
Filers earning $200K+
11.8%
▲ 0.5 pt
Total filers
22,800
▼ 1.6%
GET /zipc/v2/zipcodes/91765/soi?year=… $53K 2020 $61K 2021 $63K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 91765 ZCTA.

2000
46,520
 
2010
46,457
▼ -0.1%
2020
46,449
▼ -0.0%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 91765. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 91765

Diamond Bar and its immediate neighbors, sorted by distance.

3 mi
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Distance from 91765 to any ZIP

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06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypeBranch
Carrier Route SortD
USPS Finance Number056168
City AliasesDiamond Bar, Pomona

07Frequently Asked Questions

What county is ZIP code 91765 in?

ZIP code 91765 is in Los Angeles County, California (county FIPS code 06037).

What city is ZIP code 91765?

The primary USPS city for 91765 is Diamond Bar, CA.

What metro area (MSA) is 91765 in?

91765 is part of the Los Angeles-Long Beach-Anaheim, CA Metro Area (MSA code 31080).

What is the population of ZIP code 91765?

The 2020 Census population of 91765 was 46,449 residents.

What is the median income in ZIP code 91765?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 91765 is about $63,462, with around 12% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.