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/20731

20731

ZIP 20731 is in Capitol Heights, Maryland, in Prince George's County; Eastern time. Capitol Heights has 5 ZIP codes; the others are 20743, 20790, 20791 and 20799.

Type
No street area
Time zone
America/New_York
Coordinates
38.8851, -76.9158

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 20743, whose figures describe that area — not this ZIP code.

☼ Live from 20731 — Capitol Heights, MD

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Where 20731 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 20731
  • 🔢 Type 20731 into a pocket calculator and turn it upside down: IELOZ — not quite a word, sorry.
  • ➕ 20731 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000011111011
  • 🏠 Its numerical neighbours: 20726 (Laurel, MD, 15 mi away) and 20732 (Chesapeake Beach, MD, 26 mi away).
  • 🔄 Backwards, 20731 becomes 13702, which is not a ZIP code at all.
  • 👥 63 other ZIP codes are made of exactly the same digits (01237, 02137, 02713, 03217, 10273, 12037, …). The farthest-flung twin is 73021 in Colony, OK, 1,221 miles away.
  • 🧭 Farther south than 52% of all ZIP codes, and farther east than 82%.
  • 🎯1,156 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20731 and you would come out at 38.89°S, 103.08°E — 863 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 20731 today
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Source: USGS.

Land area

ZIP codes near 20731

ZIPCityDistance
20743 Capitol Heights, MD 1.2 mi
20019 Washington, DC 1.5 mi
20752 Suitland, MD 2.6 mi
20747 District Heights, MD 2.8 mi
20785 Hyattsville, MD 2.9 mi
20746 Suitland, MD 3.4 mi
20020 Washington, DC 3.8 mi
20722 Brentwood, MD 3.9 mi
20002 Washington, DC 3.9 mi
20710 Bladensburg, MD 3.9 mi

Find every ZIP code within 10 miles of 20731 →

Questions about this ZIP code

Where is ZIP code 20731?

20731 is in Capitol Heights, Maryland, in Prince George's County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.8851, -76.9158.

What county is 20731 in?

20731 lies in Prince George's County.

What time zone is 20731 in?

20731 uses America/New_York.

What ZIP codes are near 20731?

The closest are 20743 (1.2 mi), 20019 (1.5 mi), 20752 (2.6 mi), 20747 (2.8 mi) and 20785 (2.9 mi).

Is 20731 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. “20731 ZIP Code — Capitol Heights, Maryland (Prince George's County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20731

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20731.json

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