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/20451

20451

ZIP 20451 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
38.8977, -77.0444

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 20451 — Washington, DC

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Where 20451 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 20451
  • 🔢 Type 20451 into a pocket calculator and turn it upside down: IShOZ — not quite a word, sorry.
  • ➕ As a number, 20,451 = 3 × 17 × 401. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100111111100011
  • 🏠 Its numerical neighbours: 20447 (Washington, DC, 1 mi away) and 20453 (Washington, DC, 2 mi away).
  • 🔄 Backwards, 20451 becomes 15402, which is not a ZIP code at all.
  • 👥 73 other ZIP codes are made of exactly the same digits (01245, 01254, 01452, 01524, 01542, 02145, …). The farthest-flung twin is 51240 in Inwood, IA, 1,053 miles away.
  • 🧭 Farther south than 51% 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 20451 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 20451 today
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🌋 Shake report
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Source: USGS.

Land area

ZIP codes near 20451

ZIPCityDistance
20431 Washington, DC 0.1 mi
20006 Washington, DC 0.2 mi
20415 Washington, DC 0.2 mi
20052 Washington, DC 0.2 mi
20433 Washington, DC 0.2 mi
20503 Washington, DC 0.2 mi
20456 Washington, DC 0.2 mi
20240 Washington, DC 0.2 mi
20435 Washington, DC 0.2 mi
20570 Washington, DC 0.3 mi

Find every ZIP code within 10 miles of 20451 →

Questions about this ZIP code

Where is ZIP code 20451?

20451 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 38.8977, -77.0444.

What county is 20451 in?

20451 lies in District of Columbia.

What area code is 20451?

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

What time zone is 20451 in?

20451 uses America/New_York.

What ZIP codes are near 20451?

The closest are 20431 (0.1 mi), 20006 (0.2 mi), 20415 (0.2 mi), 20052 (0.2 mi) and 20433 (0.2 mi).

Is 20451 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. “20451 ZIP Code — Washington, District of Columbia.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20451

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20451.json

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