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/93403

93403

ZIP 93403 is in San Luis Obispo, California, in San Luis Obispo County; area codes 805 and 820; Pacific time. San Luis Obispo has 8 ZIP codes in all.

Type
No street area
Time zone
America/Los_Angeles
Coordinates
35.2828, -120.6596

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 93401, whose figures describe that area — not this ZIP code.

☼ Live from 93403 — San Luis Obispo, CA

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Where 93403 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 93403
  • 🔢 Type 93403 into a pocket calculator and turn it upside down: EOhEG — not quite a word, sorry.
  • ➕ As a number, 93,403 = 23 × 31 × 131. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110110011011011
  • 🏠 Its numerical neighbours: 93402 (Los Osos, CA, 10 mi away) and 93405 (San Luis Obispo, CA, 4 mi away).
  • 🔄 Backwards, 93403 becomes 30439 — and that is a real ZIP code: Metter, GA, 2,209 miles away.
  • 👥 22 other ZIP codes are made of exactly the same digits (04933, 30349, 30394, 30439, 33409, 33904, …). The farthest-flung twin is 34039 in APO AA, a military post office, 3,656 miles away.
  • 🧭 Farther south than 73% 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 93403 and you would come out at 35.28°S, 59.34°E — 1,023 miles from Saint-Denis, Reunion, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 32m of daylight. Shortest: 9h 46m.
🌙 The sky over 93403 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments12This ZIP12
Employees94This ZIP94
Annual payroll$4,908,000This ZIP$4,908,000

Land area

ZIP codes near 93403

ZIPCityDistance
93406 San Luis Obispo, CA 0.0 mi
93410 San Luis Obispo, CA 1.5 mi
93407 San Luis Obispo, CA 1.7 mi
93409 San Luis Obispo, CA 3.5 mi
93401 San Luis Obispo, CA 4.1 mi
93408 San Luis Obispo, CA 4.3 mi
93405 San Luis Obispo, CA 4.4 mi
93449 Pismo Beach, CA 8.4 mi
93424 Avila Beach, CA 9.2 mi
93448 Pismo Beach, CA 9.7 mi

Find every ZIP code within 10 miles of 93403 →

Questions about this ZIP code

Where is ZIP code 93403?

93403 is in San Luis Obispo, California, in San Luis Obispo County, part of the San Luis Obispo-Paso Robles, CA metropolitan area. Its published point location is 35.2828, -120.6596.

What county is 93403 in?

93403 lies in San Luis Obispo County.

What area code is 93403?

San Luis Obispo uses area codes 805 and 820, from NANPA's telephone records.

What time zone is 93403 in?

93403 uses America/Los_Angeles.

What ZIP codes are near 93403?

The closest are 93406 (0 mi), 93410 (1.5 mi), 93407 (1.7 mi), 93409 (3.5 mi) and 93401 (4.1 mi).

Is 93403 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. “93403 ZIP Code — San Luis Obispo, California (San Luis Obispo County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/93403

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/93403.json

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