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/20523

20523

ZIP 20523 is in Washington, District of Columbia; area codes 202 and 771; Eastern time. Washington has 271 ZIP codes in all.

Type
No street area
Time zone
America/New_York
Coordinates
38.8945, -77.0478

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 20520, whose figures describe that area — not this ZIP code.

☼ Live from 20523 — Washington, DC

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Where 20523 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 20523
  • 🔢 Type 20523 into a pocket calculator and turn it upside down: EZSOZ — not quite a word, sorry.
  • ➕ As a number, 20,523 = 3 × 6841. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000000101011
  • 🏠 Its numerical neighbours: 20522 (Washington, DC, 0 mi away) and 20524 (Washington, DC, 1 mi away).
  • 🔄 Backwards, 20523 becomes 32502 — and that is a real ZIP code: Pensacola, FL, 823 miles away.
  • 👥 37 other ZIP codes are made of exactly the same digits (02325, 02532, 03225, 03252, 20235, 22035, …). The farthest-flung twin is 50223 in Pilot Mound, IA, 919 miles away.
  • 🧭 Farther south than 52% of all ZIP codes, and farther east than 81%.
  • 🎯1,149 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20523 and you would come out at 38.89°S, 102.95°E — 869 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 20523 today
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Source: USGS.

Land area

ZIP codes near 20523

ZIPCityDistance
20520 Washington, DC 0.0 mi
20522 Washington, DC 0.1 mi
20418 Washington, DC 0.1 mi
20551 Washington, DC 0.2 mi
20245 Washington, DC 0.2 mi
20415 Washington, DC 0.2 mi
20240 Washington, DC 0.3 mi
20451 Washington, DC 0.3 mi
20052 Washington, DC 0.3 mi
20037 Washington, DC 0.4 mi

Find every ZIP code within 10 miles of 20523 →

Questions about this ZIP code

Where is ZIP code 20523?

20523 is in Washington, District of Columbia, in District of Columbia, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.8945, -77.0478.

What county is 20523 in?

20523 lies in District of Columbia.

What area code is 20523?

Washington uses area codes 202 and 771, from NANPA's telephone records.

What time zone is 20523 in?

20523 uses America/New_York.

What ZIP codes are near 20523?

The closest are 20520 (0 mi), 20522 (0.1 mi), 20418 (0.1 mi), 20551 (0.2 mi) and 20245 (0.2 mi).

Is 20523 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.

Download or cite

Cite this page

zipcodes.pro. “20523 ZIP Code — Washington, District of Columbia.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20523

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20523.json

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