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ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/91765

91765

ZIP 91765 is Diamond Bar, California, in Los Angeles County; area codes 909 and 840; Pacific time.

Type
Standard
Time zone
America/Los_Angeles
County
Los Angeles
Population
44,502
Coordinates
33.9852, -117.8120
☼ Live from 91765 — Diamond Bar, CA

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Where 91765 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 91765
  • 🔢 Type 91765 into a pocket calculator and turn it upside down: SgLIG — not quite a word, sorry.
  • ➕ As a number, 91,765 = 5 × 18353. Its digits add up to 28, a total 1,520 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011001110101
  • 🏠 Its numerical neighbours: 91764 (Ontario, CA, 13 mi away) and 91766 (Pomona, CA, 5 mi away).
  • 🔄 Backwards, 91765 becomes 56719, which is not a ZIP code at all.
  • 👥 32 other ZIP codes are made of exactly the same digits (15679, 15697, 17569, 17965, 19567, 59716, …). The farthest-flung twin is 96517 in FPO AA, a military post office, 5,885 miles away.
  • 🧭 Farther south than 79% of all ZIP codes, and farther west than 91%.
  • 🎯1,134 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91765 and you would come out at 33.99°S, 62.19°E — 994 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 25m of daylight. Shortest: 9h 53m.
  • 📏 At 18.6 square miles of land, 91765 is bigger than 36% of ZIP codes — room for about 14 Central Parks.
🌙 The sky over 91765 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population44,502This ZIP44,502
Households15,233This ZIP15,233
Housing units16,078This ZIP16,078
Median age46.0This ZIP46.0California37.9US 38.9
Median household income$105,565This ZIP$105,565California$99,122US $80,734
Median home value$915,100This ZIP$915,100California$734,700US $332,700
Median gross rent$2,486This ZIP$2,486California$2,036US $1,413
Bachelor's degree or higher53.7%This ZIP53.7%
Mean commute33.1 minThis ZIP33.1 min
Population density2,396.7 / sq miThis ZIP2,396.7 / sq mi

Business and tax activity

Business establishments1,793This ZIP1,793
Employees11,381This ZIP11,381
Annual payroll$690,770,000This ZIP$690,770,000
Tax returns filed22,800This ZIP22,800
Total adjusted gross income$2,516,353,000This ZIP$2,516,353,000

Land area

Land area18.57 sq miThis ZIP18.57 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Other place names in 91765

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 91765

ZIPCityDistance
91789 Walnut, CA 3.4 mi
91788 Walnut, CA 3.9 mi
92823 Brea, CA 4.0 mi
92821 Brea, CA 4.4 mi
91766 Pomona, CA 5.1 mi
91748 Rowland Heights, CA 5.2 mi
91768 Pomona, CA 5.6 mi
91709 Chino Hills, CA 5.7 mi
91792 West Covina, CA 5.8 mi
91769 Pomona, CA 5.9 mi

Find every ZIP code within 10 miles of 91765 →

Questions about this ZIP code

Where is ZIP code 91765?

91765 is in Diamond Bar, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 33.9852, -117.8120.

What county is 91765 in?

91765 lies in Los Angeles County.

What area code is 91765?

Diamond Bar uses area codes 909 and 840, from NANPA's telephone records.

What time zone is 91765 in?

91765 uses America/Los_Angeles.

How many people live in 91765?

About 44,502 people live in ZIP code 91765, in 15,233 households, at 2,396.7 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 91765?

$105,565 a year, against $99,122 across California.

What ZIP codes are near 91765?

The closest are 91789 (3.4 mi), 91788 (3.9 mi), 92823 (4 mi), 92821 (4.4 mi) and 91766 (5.1 mi).

Is 91765 a PO Box ZIP code?

91765 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “91765 ZIP Code — Diamond Bar, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91765

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