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/21088

21088

ZIP 21088 is Lineboro, Maryland, in Carroll County; area codes 443, 667 and 410; Eastern time.

Type
No street area
Time zone
America/New_York
County
Carroll
Coordinates
39.7187, -76.8439

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 21102, whose figures describe that area — not this ZIP code.

☼ Live from 21088 — Lineboro, MD

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Where 21088 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 21088
  • 🔢 Type 21088 into a pocket calculator and turn it upside down: BBOIZ — not quite a word, sorry.
  • ➕ As a number, 21,088 = 2 × 2 × 2 × 2 × 2 × 659. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001001100000
  • 🏠 Its numerical neighbours: 21087 (Kingsville, MD, 30 mi away) and 21090 (Linthicum Heights, MD, 36 mi away).
  • 🔄 Backwards, 21088 becomes 88012 — and that is a real ZIP code: Las Cruces, NM, 1,732 miles away.
  • 👥 29 other ZIP codes are made of exactly the same digits (02188, 02818, 02881, 08218, 08812, 08821, …). The farthest-flung twin is 88021 in Anthony, NM, 1,751 miles away.
  • 🧭 Farther north than 54% of all ZIP codes, and farther east than 82%.
  • 🎯1,151 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21088 and you would come out at 39.72°S, 103.16°E — 890 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 21m.
🌙 The sky over 21088 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments3This ZIP3
Employees10This ZIP10
Annual payroll$400,000This ZIP$400,000

Land area

ZIP codes near 21088

ZIPCityDistance
21102 Manchester, MD 1.8 mi
17329 Glenville, PA 2.8 mi
17327 Glen Rock, PA 6.4 mi
21074 Hampstead, MD 6.7 mi
17311 Codorus, PA 6.8 mi
21053 Freeland, MD 7.0 mi
17354 Porters Sideling, PA 7.9 mi
17355 Railroad, PA 8.4 mi
17331 Hanover, PA 8.8 mi
17362 Spring Grove, PA 9.0 mi

Find every ZIP code within 10 miles of 21088 →

Questions about this ZIP code

Where is ZIP code 21088?

21088 is in Lineboro, Maryland, in Carroll County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.7187, -76.8439.

What county is 21088 in?

21088 lies in Carroll County.

What area code is 21088?

Lineboro uses area codes 443, 667 and 410, from NANPA's telephone records.

What time zone is 21088 in?

21088 uses America/New_York.

What ZIP codes are near 21088?

The closest are 21102 (1.8 mi), 17329 (2.8 mi), 17327 (6.4 mi), 21074 (6.7 mi) and 17311 (6.8 mi).

Is 21088 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. “21088 ZIP Code — Lineboro, Maryland (Carroll County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21088

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21088.json

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