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/20355

20355

ZIP 20355 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
38.8951, -77.0369

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 20230, whose figures describe that area — not this ZIP code.

☼ Live from 20355 — Washington, DC

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Where 20355 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 20355
  • 🔢 Type 20355 into a pocket calculator and turn it upside down: SSEOZ — not quite a word, sorry.
  • ➕ As a number, 20,355 = 3 × 5 × 23 × 59. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100111110000011
  • 🏠 Its numerical neighbours: 20350 (Washington, DC, 1 mi away) and 20370 (Washington, DC, 1 mi away).
  • 🔄 Backwards, 20355 becomes 55302 — and that is a real ZIP code: Annandale, MN, 977 miles away.
  • 👥 39 other ZIP codes are made of exactly the same digits (02355, 02535, 02553, 03255, 05253, 05352, …). The farthest-flung twin is 55320 in Clearwater, MN, 979 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 20355 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 20355 today
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Source: USGS.

Land area

ZIP codes near 20355

ZIPCityDistance
20528 Washington, DC 0.0 mi
20237 Washington, DC 0.0 mi
56901 Washington, DC 0.0 mi
56915 Washington, DC 0.0 mi
56920 Washington, DC 0.0 mi
56933 Washington, DC 0.0 mi
56944 Washington, DC 0.0 mi
20068 Washington, DC 0.0 mi
20228 Washington, DC 0.0 mi
20374 Washington Navy Yard, DC 0.0 mi

Find every ZIP code within 10 miles of 20355 →

Questions about this ZIP code

Where is ZIP code 20355?

20355 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 38.8951, -77.0369.

What county is 20355 in?

20355 lies in District of Columbia.

What area code is 20355?

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

What time zone is 20355 in?

20355 uses America/New_York.

What ZIP codes are near 20355?

The closest are 20528 (0 mi), 20237 (0 mi), 56901 (0 mi), 56915 (0 mi) and 56920 (0 mi).

Is 20355 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. “20355 ZIP Code — Washington, District of Columbia.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20355

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20355.json

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