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/94543

94543

ZIP 94543 is in Hayward, California, in Alameda County; area codes 510 and 341; Pacific time. Hayward has 7 ZIP codes in all.

Type
No street area
Time zone
America/Los_Angeles
County
Alameda
Coordinates
37.6688, -122.0808

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 94541, whose figures describe that area — not this ZIP code.

☼ Live from 94543 — Hayward, CA

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Where 94543 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 94543
  • 🔢 Type 94543 into a pocket calculator and turn it upside down: EhShG — not quite a word, sorry.
  • ➕ 94543 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: 10111000101001111
  • 🏠 Its numerical neighbours: 94542 (Hayward, CA, 3 mi away) and 94544 (Hayward, CA, 3 mi away).
  • 🔄 Backwards, 94543 becomes 34549, which is not a ZIP code at all.
  • 👥 25 other ZIP codes are made of exactly the same digits (34945, 34954, 35449, 43549, 43945, 45349, …). The farthest-flung twin is 34954 in Fort Pierce, FL, 2,507 miles away.
  • 🧭 Farther south than 60% of all ZIP codes, and farther west than 96%.
  • 🎯1,271 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94543 and you would come out at 37.67°S, 57.92°E — 1,013 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 46m of daylight. Shortest: 9h 33m.
🌙 The sky over 94543 today
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Source: USGS.

Land area

ZIP codes near 94543

ZIPCityDistance
94541 Hayward, CA 0.5 mi
94544 Hayward, CA 2.8 mi
94580 San Lorenzo, CA 2.9 mi
94542 Hayward, CA 3.1 mi
94578 San Leandro, CA 3.6 mi
94545 Hayward, CA 3.6 mi
94579 San Leandro, CA 4.4 mi
94552 Castro Valley, CA 4.7 mi
94546 Castro Valley, CA 5.4 mi
94587 Union City, CA 5.5 mi

Find every ZIP code within 10 miles of 94543 →

Questions about this ZIP code

Where is ZIP code 94543?

94543 is in Hayward, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.6688, -122.0808.

What county is 94543 in?

94543 lies in Alameda County.

What area code is 94543?

Hayward uses area codes 510 and 341, from NANPA's telephone records.

What time zone is 94543 in?

94543 uses America/Los_Angeles.

What ZIP codes are near 94543?

The closest are 94541 (0.5 mi), 94544 (2.8 mi), 94580 (2.9 mi), 94542 (3.1 mi) and 94578 (3.6 mi).

Is 94543 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. “94543 ZIP Code — Hayward, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94543

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/94543.json

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