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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/21742

21742

ZIP 21742 is in Hagerstown, Maryland, in Washington County; area codes 240, 301 and 227; Eastern time. Hagerstown has 6 ZIP codes; the others are 21740, 21741, 21746, 21747 and 21749.

Type
Standard
Time zone
America/New_York
County
Washington
Population
34,069
Coordinates
39.6782, -77.6527
☼ Live from 21742 — Hagerstown, MD

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Where 21742 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 21742
  • 🔢 Type 21742 into a pocket calculator and turn it upside down: ZhLIZ — not quite a word, sorry.
  • ➕ As a number, 21,742 = 2 × 7 × 1553. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010011101110
  • 🏠 Its numerical neighbours: 21741 (Hagerstown, MD, 4 mi away) and 21746 (Hagerstown, MD, 8 mi away).
  • 🔄 Backwards, 21742 becomes 24712 — and that is a real ZIP code: Athens, WV, 238 miles away.
  • 👥 31 other ZIP codes are made of exactly the same digits (12247, 12427, 12472, 12724, 12742, 14227, …). The farthest-flung twin is 71422 in Dodson, LA, 989 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 79%.
  • 🎯1,109 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21742 and you would come out at 39.68°S, 102.35°E — 925 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 21m.
  • 📏 At 46.5 square miles of land, 21742 is bigger than 58% of ZIP codes — room for about 35 Central Parks.
🌙 The sky over 21742 today
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🌋 Shake report
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Source: USGS.

People and housing

Population34,069This ZIP34,069
Households13,231This ZIP13,231
Housing units13,888This ZIP13,888
Median age41.7This ZIP41.7Maryland39.4US 38.9
Median household income$86,288This ZIP$86,288Maryland$103,678US $80,734
Median home value$304,800This ZIP$304,800Maryland$419,900US $332,700
Median gross rent$1,351This ZIP$1,351Maryland$1,705US $1,413
Bachelor's degree or higher31.2%This ZIP31.2%
Mean commute27.4 minThis ZIP27.4 min
Population density732.7 / sq miThis ZIP732.7 / sq mi

Business and tax activity

Business establishments642This ZIP642
Employees13,567This ZIP13,567
Annual payroll$784,494,000This ZIP$784,494,000
Tax returns filed17,150This ZIP17,150
Total adjusted gross income$1,387,700,000This ZIP$1,387,700,000

Land area

Land area46.50 sq miThis ZIP46.50 sq mi
Water area0.03 sq miThis ZIP0.03 sq mi

Other place names in 21742

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 21742

ZIPCityDistance
21721 Chewsville, MD 2.6 mi
21720 Cavetown, MD 4.2 mi
21741 Hagerstown, MD 4.4 mi
21747 Hagerstown, MD 4.4 mi
21749 Hagerstown, MD 4.4 mi
17263 State Line, PA 4.7 mi
21767 Maugansville, MD 5.2 mi
21783 Smithsburg, MD 5.6 mi
21734 Funkstown, MD 5.7 mi
21740 Hagerstown, MD 5.8 mi

Find every ZIP code within 10 miles of 21742 →

Questions about this ZIP code

Where is ZIP code 21742?

21742 is in Hagerstown, Maryland, in Washington County, part of the Hagerstown-Martinsburg, MD-WV metropolitan area. Its published point location is 39.6782, -77.6527.

What county is 21742 in?

21742 lies in Washington County.

What area code is 21742?

Hagerstown uses area codes 240, 301 and 227, from NANPA's telephone records.

What time zone is 21742 in?

21742 uses America/New_York.

How many people live in 21742?

About 34,069 people live in ZIP code 21742, in 13,231 households, at 732.7 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 21742?

$86,288 a year, against $103,678 across Maryland.

What ZIP codes are near 21742?

The closest are 21721 (2.6 mi), 21720 (4.2 mi), 21741 (4.4 mi), 21747 (4.4 mi) and 21749 (4.4 mi).

Is 21742 a PO Box ZIP code?

21742 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21742 ZIP Code — Hagerstown, Maryland (Washington County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21742

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