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/94820

94820

ZIP 94820 is in El Sobrante, California, in Contra Costa County; area codes 510 and 341; Pacific time. El Sobrante has 2 ZIP codes; the other is 94803.

Type
No street area
Time zone
America/Los_Angeles
County
Contra Costa
Coordinates
37.9771, -122.2952

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 94803, whose figures describe that area — not this ZIP code.

☼ Live from 94820 — El Sobrante, CA

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Where 94820 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 94820
  • 🔢 Type 94820 into a pocket calculator and turn it upside down: OZBhG — not quite a word, sorry.
  • ➕ As a number, 94,820 = 2 × 2 × 5 × 11 × 431. Its digits add up to 23, a total 2,533 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111001001100100
  • 🏠 Its numerical neighbours: 94808 (Richmond, CA, 4 mi away) and 94850 (Richmond, CA, 4 mi away).
  • 🔄 Backwards, 94820 becomes 02849, which is not a ZIP code at all.
  • 👥 51 other ZIP codes are made of exactly the same digits (02894, 04289, 04928, 04982, 09248, 09824, …). The farthest-flung twin is 09824 in APO AE, a military post office, 7,063 miles away.
  • 🧭 Farther south than 58% 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 94820 and you would come out at 37.98°S, 57.70°E — 1,002 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 48m of daylight. Shortest: 9h 31m.
🌙 The sky over 94820 today
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Source: USGS.

Business and tax activity

Business establishments3This ZIP3
Employees4This ZIP4
Annual payroll$153,000This ZIP$153,000

Land area

ZIP codes near 94820

ZIPCityDistance
94564 Pinole, CA 1.5 mi
94803 El Sobrante, CA 1.6 mi
94806 San Pablo, CA 2.2 mi
94805 Richmond, CA 2.9 mi
94547 Hercules, CA 2.9 mi
94530 El Cerrito, CA 3.9 mi
94802 Richmond, CA 4.0 mi
94807 Richmond, CA 4.0 mi
94808 Richmond, CA 4.0 mi
94850 Richmond, CA 4.0 mi

Find every ZIP code within 10 miles of 94820 →

Questions about this ZIP code

Where is ZIP code 94820?

94820 is in El Sobrante, California, in Contra Costa County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.9771, -122.2952.

What county is 94820 in?

94820 lies in Contra Costa County.

What area code is 94820?

El Sobrante uses area codes 510 and 341, from NANPA's telephone records.

What time zone is 94820 in?

94820 uses America/Los_Angeles.

What ZIP codes are near 94820?

The closest are 94564 (1.5 mi), 94803 (1.6 mi), 94806 (2.2 mi), 94805 (2.9 mi) and 94547 (2.9 mi).

Is 94820 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. “94820 ZIP Code — El Sobrante, California (Contra Costa County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94820

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/94820.json

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