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/94023

94023

ZIP 94023 is in Los Altos, California, in Santa Clara County; area code 650; Pacific time. Los Altos has 3 ZIP codes; the others are 94022 and 94024.

Type
No street area
Time zone
America/Los_Angeles
County
Santa Clara
Coordinates
37.3852, -122.1141

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 94022, whose figures describe that area — not this ZIP code.

☼ Live from 94023 — Los Altos, CA

Weather right now

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Local time: —

Where 94023 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 94023
  • 🔢 Type 94023 into a pocket calculator and turn it upside down: EZOhG — not quite a word, sorry.
  • ➕ As a number, 94,023 = 3 × 3 × 31 × 337. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10110111101000111
  • 🏠 Its numerical neighbours: 94022 (Los Altos, CA, 3 mi away) and 94024 (Los Altos, CA, 3 mi away).
  • 🔄 Backwards, 94023 becomes 32049, which is not a ZIP code at all.
  • 👥 51 other ZIP codes are made of exactly the same digits (02349, 02493, 03249, 04239, 04923, 04932, …). The farthest-flung twin is 04932 in Dixmont, ME, 2,757 miles away.
  • 🧭 Farther south than 62% of all ZIP codes, and farther west than 96%.
  • 🎯1,278 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94023 and you would come out at 37.39°S, 57.89°E — 1,030 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 45m of daylight. Shortest: 9h 35m.
🌙 The sky over 94023 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments12This ZIP12
Employees42This ZIP42
Annual payroll$2,880,000This ZIP$2,880,000

Land area

ZIP codes near 94023

ZIPCityDistance
94040 Mountain View, CA 1.6 mi
94035 Mountain View, CA 1.7 mi
94039 Mountain View, CA 1.7 mi
94042 Mountain View, CA 1.7 mi
94041 Mountain View, CA 2.1 mi
94306 Palo Alto, CA 2.3 mi
94024 Los Altos, CA 2.5 mi
94022 Los Altos, CA 2.7 mi
94304 Palo Alto, CA 3.0 mi
94043 Mountain View, CA 3.1 mi

Find every ZIP code within 10 miles of 94023 →

Questions about this ZIP code

Where is ZIP code 94023?

94023 is in Los Altos, California, in Santa Clara County, part of the San Jose-Sunnyvale-Santa Clara, CA metropolitan area. Its published point location is 37.3852, -122.1141.

What county is 94023 in?

94023 lies in Santa Clara County.

What area code is 94023?

Los Altos uses area code 650, from NANPA's telephone records.

What time zone is 94023 in?

94023 uses America/Los_Angeles.

What ZIP codes are near 94023?

The closest are 94040 (1.6 mi), 94035 (1.7 mi), 94039 (1.7 mi), 94042 (1.7 mi) and 94041 (2.1 mi).

Is 94023 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. “94023 ZIP Code — Los Altos, California (Santa Clara County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94023

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/94023.json

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