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/20501

20501

ZIP 20501 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
38.8987, -77.0362

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 20006, whose figures describe that area — not this ZIP code.

☼ Live from 20501 — Washington, DC

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Where 20501 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 20501
  • 🔢 Type 20501 into a pocket calculator and turn it upside down: IOSOZ — not quite a word, sorry.
  • ➕ As a number, 20,501 = 13 × 19 × 83. Its digits add up to 8, a total 251 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000000010101
  • 🏠 Its numerical neighbours: 20500 (Washington, DC, 0 mi away) and 20502 (Washington, DC, 0 mi away).
  • 🔄 Backwards, 20501 becomes 10502 — and that is a real ZIP code: Ardsley, NY, 223 miles away.
  • 👥 23 other ZIP codes are made of exactly the same digits (01520, 02051, 02150, 05201, 10025, 10502, …). The farthest-flung twin is 51020 in Galva, IA, 992 miles away.
  • 🧭 Farther south than 51% of all ZIP codes, and farther east than 81%.
  • 🎯1,150 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20501 and you would come out at 38.90°S, 102.96°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 20501 today
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🌋 Shake report
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Source: USGS.

Land area

ZIP codes near 20501

ZIPCityDistance
20502 Washington, DC 0.0 mi
20509 Washington, DC 0.0 mi
20506 Washington, DC 0.1 mi
20062 Washington, DC 0.1 mi
20220 Washington, DC 0.1 mi
20571 Washington, DC 0.2 mi
20577 Washington, DC 0.2 mi
20232 Washington, DC 0.2 mi
20570 Washington, DC 0.2 mi
20456 Washington, DC 0.2 mi

Find every ZIP code within 10 miles of 20501 →

Questions about this ZIP code

Where is ZIP code 20501?

20501 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 38.8987, -77.0362.

What county is 20501 in?

20501 lies in District of Columbia.

What area code is 20501?

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

What time zone is 20501 in?

20501 uses America/New_York.

What ZIP codes are near 20501?

The closest are 20502 (0 mi), 20509 (0 mi), 20506 (0.1 mi), 20062 (0.1 mi) and 20220 (0.1 mi).

Is 20501 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. “20501 ZIP Code — Washington, District of Columbia.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20501

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20501.json

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