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/20810

20810

ZIP 20810 is in Bethesda, Maryland, in Montgomery County; area codes 240, 301 and 227; Eastern time. Bethesda has 11 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
Montgomery
Coordinates
38.9806, -77.1008

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 20814, whose figures describe that area — not this ZIP code.

☼ Live from 20810 — Bethesda, MD

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Where 20810 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 20810
  • 🔢 Type 20810 into a pocket calculator and turn it upside down: OIBOZ — not quite a word, sorry.
  • ➕ As a number, 20,810 = 2 × 5 × 2081. Its digits add up to 11, a total 714 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000101001010
  • 🏠 Its numerical neighbours: 20799 (Capitol Heights, MD, 16 mi away) and 20811 (Bethesda, MD, 0 mi away).
  • 🔄 Backwards, 20810 becomes 01802, which is not a ZIP code at all.
  • 👥 35 other ZIP codes are made of exactly the same digits (00821, 01028, 01082, 02018, 02081, 02108, …). The farthest-flung twin is 00821 in Christiansted, VI, 1,645 miles away.
  • 🧭 Farther south than 51% of all ZIP codes, and farther east than 81%.
  • 🎯1,145 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20810 and you would come out at 38.98°S, 102.90°E — 875 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 54m of daylight. Shortest: 9h 26m.
🌙 The sky over 20810 today
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Source: USGS.

Business and tax activity

Business establishments3This ZIP3
Employees16This ZIP16
Annual payroll$1,006,000This ZIP$1,006,000

Land area

ZIP codes near 20810

ZIPCityDistance
20811 Bethesda, MD 0.0 mi
20824 Bethesda, MD 0.0 mi
20894 Bethesda, MD 1.1 mi
20815 Chevy Chase, MD 1.2 mi
20892 Bethesda, MD 1.4 mi
20814 Bethesda, MD 1.7 mi
20889 Bethesda, MD 1.8 mi
20816 Bethesda, MD 1.9 mi
20825 Chevy Chase, MD 2.2 mi
20015 Washington, DC 2.5 mi

Find every ZIP code within 10 miles of 20810 →

Questions about this ZIP code

Where is ZIP code 20810?

20810 is in Bethesda, Maryland, in Montgomery County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.9806, -77.1008.

What county is 20810 in?

20810 lies in Montgomery County.

What area code is 20810?

Bethesda uses area codes 240, 301 and 227, from NANPA's telephone records.

What time zone is 20810 in?

20810 uses America/New_York.

What ZIP codes are near 20810?

The closest are 20811 (0 mi), 20824 (0 mi), 20894 (1.1 mi), 20815 (1.2 mi) and 20892 (1.4 mi).

Is 20810 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. “20810 ZIP Code — Bethesda, Maryland (Montgomery County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20810

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curl https://zipcodes.pro/zip/20810.json

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