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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/20588

20588

ZIP 20588 is Dhs, Maryland, in Howard County; area codes 240 and 301; Eastern time.

Type
No street area
Time zone
America/New_York
County
Howard
Coordinates
38.7504, -76.8544

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 20735, whose figures describe that area — not this ZIP code.

☼ Live from 20588 — Dhs, MD

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Where 20588 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 20588
  • 🔢 Type 20588 into a pocket calculator and turn it upside down: BBSOZ — not quite a word, sorry.
  • ➕ As a number, 20,588 = 2 × 2 × 5147. Its digits add up to 23, a total 2,533 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000001101100
  • 🏠 Its numerical neighbours: 20586 (Washington, DC, 15 mi away) and 20590 (Washington, DC, 13 mi away).
  • 🔄 Backwards, 20588 becomes 88502, which is not a ZIP code at all.
  • 👥 26 other ZIP codes are made of exactly the same digits (02858, 02885, 05828, 08528, 08825, 08852, …). The farthest-flung twin is 85082 in Phoenix, AZ, 1,987 miles away.
  • 🧭 Farther south than 53% of all ZIP codes, and farther east than 82%.
  • 🎯1,161 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20588 and you would come out at 38.75°S, 103.15°E — 856 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 53m of daylight. Shortest: 9h 27m.
🌙 The sky over 20588 today
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🌋 Shake report
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Source: USGS.

Land area

ZIP codes near 20588

ZIPCityDistance
20623 Cheltenham, MD 0.9 mi
20735 Clinton, MD 2.6 mi
20762 Andrews Air Force Base, MD 4.2 mi
20772 Upper Marlboro, MD 5.1 mi
20697 Southern Md Facility, MD 5.9 mi
20703 Lanham, MD 5.9 mi
20717 Bowie, MD 5.9 mi
20718 Bowie, MD 5.9 mi
20719 Bowie, MD 5.9 mi
20738 Riverdale, MD 5.9 mi

Find every ZIP code within 10 miles of 20588 →

Questions about this ZIP code

Where is ZIP code 20588?

20588 is in Dhs, Maryland, in Howard County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 38.7504, -76.8544.

What county is 20588 in?

20588 lies in Howard County.

What area code is 20588?

Dhs uses area codes 240 and 301, from NANPA's telephone records.

What time zone is 20588 in?

20588 uses America/New_York.

What ZIP codes are near 20588?

The closest are 20623 (0.9 mi), 20735 (2.6 mi), 20762 (4.2 mi), 20772 (5.1 mi) and 20697 (5.9 mi).

Is 20588 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. “20588 ZIP Code — Dhs, Maryland (Howard County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20588

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20588.json

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