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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/91771

91771

ZIP 91771 is in Rosemead, California, in Los Angeles County; Pacific time. Rosemead has 3 ZIP codes; the others are 91770 and 91772.

Type
No street area
Time zone
America/Los_Angeles
County
Los Angeles
Coordinates
34.0806, -118.0728

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 91770, whose figures describe that area — not this ZIP code.

☼ Live from 91771 — Rosemead, CA

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Where 91771 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 91771
  • 🔢 Type 91771 into a pocket calculator and turn it upside down: ILLIG — not quite a word, sorry.
  • ➕ 91771 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110011001111011
  • 🏠 Its numerical neighbours: 91770 (Rosemead, CA, 1 mi away) and 91772 (Rosemead, CA, 0 mi away).
  • 🔄 Backwards, 91771 becomes 17719, which is not a ZIP code at all.
  • 👥 10 other ZIP codes are made of exactly the same digits (11779, 11797, 11977, 19177, 19717, 71971, …). The farthest-flung twin is 11977 in Westhampton, NY, 2,505 miles away.
  • 🧭 Farther south than 78% of all ZIP codes, and farther west than 91%.
  • 🎯1,144 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 91771 and you would come out at 34.08°S, 61.93°E — 994 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 26m of daylight. Shortest: 9h 53m.
🌙 The sky over 91771 today
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Source: USGS.

Land area

ZIP codes near 91771

ZIPCityDistance
91772 Rosemead, CA 0.0 mi
91770 Rosemead, CA 1.2 mi
91776 San Gabriel, CA 1.4 mi
91731 El Monte, CA 1.7 mi
91780 Temple City, CA 1.7 mi
91778 San Gabriel, CA 2.2 mi
91775 San Gabriel, CA 2.6 mi
91733 South El Monte, CA 2.6 mi
91734 El Monte, CA 2.7 mi
91735 El Monte, CA 2.7 mi

Find every ZIP code within 10 miles of 91771 →

Questions about this ZIP code

Where is ZIP code 91771?

91771 is in Rosemead, California, in Los Angeles County, part of the Los Angeles-Long Beach-Anaheim, CA metropolitan area. Its published point location is 34.0806, -118.0728.

What county is 91771 in?

91771 lies in Los Angeles County.

What time zone is 91771 in?

91771 uses America/Los_Angeles.

What ZIP codes are near 91771?

The closest are 91772 (0 mi), 91770 (1.2 mi), 91776 (1.4 mi), 91731 (1.7 mi) and 91780 (1.7 mi).

Is 91771 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. “91771 ZIP Code — Rosemead, California (Los Angeles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/91771

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/91771.json

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