Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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/91009

91009

ZIP 91009 is in Duarte, California, in Los Angeles County; area code 626; Pacific time. Duarte has 3 ZIP codes; the others are 91008 and 91010.

Type
No street area
Time zone
America/Los_Angeles
County
Los Angeles
Coordinates
34.1395, -117.9773

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 91010, whose figures describe that area — not this ZIP code.

☼ Live from 91009 — Duarte, CA

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Where 91009 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 91009
  • 🔢 Type 91009 into a pocket calculator and turn it upside down: GOOIG — not quite a word, sorry.
  • ➕ 91009 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110001110000001
  • 🏠 Its numerical neighbours: 91008 (Duarte, CA, 1 mi away) and 91010 (Duarte, CA, 1 mi away).
  • 🔄 Backwards, 91009 becomes 90019 — and that is a real ZIP code: Los Angeles, CA, 22 miles away.
  • 👥 8 other ZIP codes are made of exactly the same digits (00919, 09091, 10990, 19009, 19090, 90019, …). The farthest-flung twin is 09091 in APO AE, a military post office, 5,778 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 91%.
  • 🎯1,138 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91009 and you would come out at 34.14°S, 62.02°E — 1,000 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 26m of daylight. Shortest: 9h 52m.
🌙 The sky over 91009 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments4This ZIP4
Employees21This ZIP21
Annual payroll$969,000This ZIP$969,000

Land area

ZIP codes near 91009

ZIPCityDistance
91008 Duarte, CA 1.1 mi
91010 Duarte, CA 1.1 mi
91017 Monrovia, CA 1.4 mi
91016 Monrovia, CA 1.6 mi
91006 Arcadia, CA 2.8 mi
91706 Baldwin Park, CA 3.0 mi
91066 Arcadia, CA 3.3 mi
91077 Arcadia, CA 3.3 mi
91007 Arcadia, CA 4.1 mi
91025 Sierra Madre, CA 4.6 mi

Find every ZIP code within 10 miles of 91009 →

Questions about this ZIP code

Where is ZIP code 91009?

91009 is in Duarte, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 34.1395, -117.9773.

What county is 91009 in?

91009 lies in Los Angeles County.

What area code is 91009?

Duarte uses area code 626, from NANPA's telephone records.

What time zone is 91009 in?

91009 uses America/Los_Angeles.

What ZIP codes are near 91009?

The closest are 91008 (1.1 mi), 91010 (1.1 mi), 91017 (1.4 mi), 91016 (1.6 mi) and 91006 (2.8 mi).

Is 91009 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “91009 ZIP Code — Duarte, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91009

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/91009.json

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