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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/93421

93421

ZIP 93421 is in Arroyo Grande, California, in San Luis Obispo County; area codes 805 and 820; Pacific time. Arroyo Grande has 2 ZIP codes; the other is 93420.

Type
No street area
Time zone
America/Los_Angeles
Coordinates
35.1186, -120.5907

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 93420, whose figures describe that area — not this ZIP code.

☼ Live from 93421 — Arroyo Grande, CA

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Where 93421 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 93421
  • 🔢 Type 93421 into a pocket calculator and turn it upside down: IZhEG — not quite a word, sorry.
  • ➕ As a number, 93,421 = 103 × 907. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110110011101101
  • 🏠 Its numerical neighbours: 93420 (Arroyo Grande, CA, 8 mi away) and 93422 (Atascadero, CA, 25 mi away).
  • 🔄 Backwards, 93421 becomes 12439 — and that is a real ZIP code: Hensonville, NY, 2,518 miles away.
  • 👥 41 other ZIP codes are made of exactly the same digits (12439, 12493, 12934, 12943, 13492, 19342, …). The farthest-flung twin is 12493 in West Park, NY, 2,533 miles away.
  • 🧭 Farther south than 74% of all ZIP codes, and farther west than 94%.
  • 🎯1,246 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 93421 and you would come out at 35.12°S, 59.41°E — 1,013 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 31m of daylight. Shortest: 9h 47m.
🌙 The sky over 93421 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments8This ZIP8
Employees69This ZIP69
Annual payroll$2,677,000This ZIP$2,677,000

Land area

ZIP codes near 93421

ZIPCityDistance
93433 Grover Beach, CA 1.6 mi
93475 Oceano, CA 1.7 mi
93483 Grover Beach, CA 1.7 mi
93448 Pismo Beach, CA 3.3 mi
93449 Pismo Beach, CA 4.6 mi
93445 Oceano, CA 5.4 mi
93420 Arroyo Grande, CA 7.6 mi
93444 Nipomo, CA 7.6 mi
93401 San Luis Obispo, CA 8.2 mi
93403 San Luis Obispo, CA 12.0 mi

Find every ZIP code within 10 miles of 93421 →

Questions about this ZIP code

Where is ZIP code 93421?

93421 is in Arroyo Grande, California, in San Luis Obispo County, part of the San Luis Obispo-Paso Robles, CA metropolitan area. Its published point location is 35.1186, -120.5907.

What county is 93421 in?

93421 lies in San Luis Obispo County.

What area code is 93421?

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

What time zone is 93421 in?

93421 uses America/Los_Angeles.

What ZIP codes are near 93421?

The closest are 93433 (1.6 mi), 93475 (1.7 mi), 93483 (1.7 mi), 93448 (3.3 mi) and 93449 (4.6 mi).

Is 93421 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. “93421 ZIP Code — Arroyo Grande, California (San Luis Obispo County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/93421

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/93421.json

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