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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/93423

93423

ZIP 93423 is in Atascadero, California, in San Luis Obispo County; area codes 805 and 820; Pacific time. Atascadero has 2 ZIP codes; the other is 93422.

Type
No street area
Time zone
America/Los_Angeles
Coordinates
35.4282, -120.7695

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 93422, whose figures describe that area — not this ZIP code.

☼ Live from 93423 — Atascadero, CA

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Where 93423 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 93423
  • 🔢 Type 93423 into a pocket calculator and turn it upside down: EZhEG — not quite a word, sorry.
  • ➕ As a number, 93,423 = 3 × 11 × 19 × 149. Its digits add up to 21, a total 2,594 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110110011101111
  • 🏠 Its numerical neighbours: 93422 (Atascadero, CA, 5 mi away) and 93424 (Avila Beach, CA, 16 mi away).
  • 🔄 Backwards, 93423 becomes 32439 — and that is a real ZIP code: Freeport, FL, 2,027 miles away.
  • 👥 23 other ZIP codes are made of exactly the same digits (23439, 23934, 23943, 29334, 29433, 32439, …). The farthest-flung twin is 33429 in Boca Raton, FL, 2,474 miles away.
  • 🧭 Farther south than 72% of all ZIP codes, and farther west than 94%.
  • 🎯1,248 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 93423 and you would come out at 35.43°S, 59.23°E — 1,031 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 33m of daylight. Shortest: 9h 46m.
🌙 The sky over 93423 today
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  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments12This ZIP12
Employees109This ZIP109
Annual payroll$2,854,000This ZIP$2,854,000

Land area

ZIP codes near 93423

ZIPCityDistance
93442 Morro Bay, CA 2.5 mi
93422 Atascadero, CA 5.2 mi
93443 Morro Bay, CA 6.3 mi
93408 San Luis Obispo, CA 7.9 mi
93465 Templeton, CA 8.2 mi
93409 San Luis Obispo, CA 8.3 mi
93412 Los Osos, CA 8.8 mi
93405 San Luis Obispo, CA 9.0 mi
93402 Los Osos, CA 9.9 mi
93407 San Luis Obispo, CA 10.1 mi

Find every ZIP code within 10 miles of 93423 →

Questions about this ZIP code

Where is ZIP code 93423?

93423 is in Atascadero, California, in San Luis Obispo County, part of the San Luis Obispo-Paso Robles, CA metropolitan area. Its published point location is 35.4282, -120.7695.

What county is 93423 in?

93423 lies in San Luis Obispo County.

What area code is 93423?

Atascadero uses area codes 805 and 820, from NANPA's telephone records.

What time zone is 93423 in?

93423 uses America/Los_Angeles.

What ZIP codes are near 93423?

The closest are 93442 (2.5 mi), 93422 (5.2 mi), 93443 (6.3 mi), 93408 (7.9 mi) and 93465 (8.2 mi).

Is 93423 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. “93423 ZIP Code — Atascadero, California (San Luis Obispo County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/93423

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/93423.json

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