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/94620

94620

ZIP 94620 is Piedmont, California, in Alameda County; Pacific time.

Type
No street area
Time zone
America/Los_Angeles
County
Alameda
Coordinates
37.8244, -122.2316

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 94611, whose figures describe that area — not this ZIP code.

☼ Live from 94620 — Piedmont, CA

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Where 94620 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 94620
  • 🔢 Type 94620 into a pocket calculator and turn it upside down: OZghG — not quite a word, sorry.
  • ➕ As a number, 94,620 = 2 × 2 × 3 × 5 × 19 × 83. Its digits add up to 21, a total 2,594 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000110011100
  • 🏠 Its numerical neighbours: 94619 (Oakland, CA, 4 mi away) and 94621 (Oakland, CA, 5 mi away).
  • 🔄 Backwards, 94620 becomes 02649 — and that is a real ZIP code: Mashpee, MA, 2,721 miles away.
  • 👥 50 other ZIP codes are made of exactly the same digits (02649, 04629, 04926, 04962, 06249, 06492, …). The farthest-flung twin is 09624 in APO AE, a military post office, 6,236 miles away.
  • 🧭 Farther south than 59% of all ZIP codes, and farther west than 96%.
  • 🎯1,277 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94620 and you would come out at 37.82°S, 57.77°E — 1,008 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 47m of daylight. Shortest: 9h 32m.
🌙 The sky over 94620 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments4This ZIP4
Employees40This ZIP40
Annual payroll$3,888,000This ZIP$3,888,000

Land area

ZIP codes near 94620

ZIPCityDistance
94610 Oakland, CA 1.0 mi
94611 Oakland, CA 1.0 mi
94618 Oakland, CA 1.5 mi
94622 Oakland, CA 1.8 mi
94609 Oakland, CA 1.9 mi
94602 Oakland, CA 2.0 mi
94612 Oakland, CA 2.2 mi
94606 Oakland, CA 2.4 mi
94617 Oakland, CA 2.5 mi
94604 Oakland, CA 2.5 mi

Find every ZIP code within 10 miles of 94620 →

Questions about this ZIP code

Where is ZIP code 94620?

94620 is in Piedmont, California, in Alameda County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.8244, -122.2316.

What county is 94620 in?

94620 lies in Alameda County.

What time zone is 94620 in?

94620 uses America/Los_Angeles.

What ZIP codes are near 94620?

The closest are 94610 (1 mi), 94611 (1 mi), 94618 (1.5 mi), 94622 (1.8 mi) and 94609 (1.9 mi).

Is 94620 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. “94620 ZIP Code — Piedmont, California (Alameda County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94620

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/94620.json

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