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/21857

21857

ZIP 21857 is Rehobeth, Maryland, in Somerset County; area codes 410 and 667; Eastern time.

Type
No street area
Time zone
America/New_York
County
Somerset
Metro area
Salisbury, MD
Coordinates
38.0390, -75.6630

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 21871, whose figures describe that area — not this ZIP code.

☼ Live from 21857 — Rehobeth, MD

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Where 21857 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 21857
  • 🔢 Type 21857 into a pocket calculator and turn it upside down: LSBIZ — not quite a word, sorry.
  • ➕ As a number, 21,857 = 11 × 1987. Its digits add up to 23, a total 2,533 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010101100001
  • 🏠 Its numerical neighbours: 21856 (Quantico, MD, 21 mi away) and 21861 (Sharptown, MD, 35 mi away).
  • 🔄 Backwards, 21857 becomes 75812, which is not a ZIP code at all.
  • 👥 48 other ZIP codes are made of exactly the same digits (12578, 12758, 12785, 12857, 15278, 15728, …). The farthest-flung twin is 85172 in Stanfield, AZ, 2,059 miles away.
  • 🧭 Farther south than 58% of all ZIP codes, and farther east than 86%.
  • 🎯1,234 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21857 and you would come out at 38.04°S, 104.34°E — 775 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 48m of daylight. Shortest: 9h 31m.
🌙 The sky over 21857 today
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Source: USGS.

Land area

ZIP codes near 21857

ZIPCityDistance
21838 Marion Station, MD 4.3 mi
21871 Westover, MD 6.3 mi
21851 Pocomoke City, MD 7.0 mi
23488 Withams, VA 7.2 mi
21836 Manokin, MD 7.3 mi
23426 Sanford, VA 8.0 mi
23415 New Church, VA 8.2 mi
21890 Westover, MD 8.5 mi
21867 Upper Fairmount, MD 8.7 mi
23399 Jenkins Bridge, VA 8.8 mi

Find every ZIP code within 10 miles of 21857 →

Questions about this ZIP code

Where is ZIP code 21857?

21857 is in Rehobeth, Maryland, in Somerset County, part of the Salisbury, MD metropolitan area. Its published point location is 38.0390, -75.6630.

What county is 21857 in?

21857 lies in Somerset County.

What area code is 21857?

Rehobeth uses area codes 410 and 667, from NANPA's telephone records.

What time zone is 21857 in?

21857 uses America/New_York.

What ZIP codes are near 21857?

The closest are 21838 (4.3 mi), 21871 (6.3 mi), 21851 (7 mi), 23488 (7.2 mi) and 21836 (7.3 mi).

Is 21857 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. “21857 ZIP Code — Rehobeth, Maryland (Somerset County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21857

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21857.json

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