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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/21740

21740

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

Type
Standard
Time zone
America/New_York
County
Washington
Population
64,792
Coordinates
39.6319, -77.7439
☼ Live from 21740 — Hagerstown, MD

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Local time: —

Where 21740 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 21740
  • 🔢 Type 21740 into a pocket calculator and turn it upside down: OhLIZ — not quite a word, sorry.
  • ➕ As a number, 21,740 = 2 × 2 × 5 × 1087. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010011101100
  • 🏠 Its numerical neighbours: 21738 (Glenwood, MD, 45 mi away) and 21741 (Hagerstown, MD, 1 mi away).
  • 🔄 Backwards, 21740 becomes 04712, which is not a ZIP code at all.
  • 👥 66 other ZIP codes are made of exactly the same digits (01247, 01472, 01742, 02471, 02714, 02741, …). The farthest-flung twin is 74102 in Tulsa, OK, 1,022 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 79%.
  • 🎯1,105 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21740 and you would come out at 39.63°S, 102.26°E — 927 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 22m.
  • 📏 At 70.9 square miles of land, 21740 is bigger than 69% of ZIP codes — room for about 54 Central Parks.
🌙 The sky over 21740 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population64,792This ZIP64,792
Households25,276This ZIP25,276
Housing units27,339This ZIP27,339
Median age37.9This ZIP37.9Maryland39.4US 38.9
Median household income$62,873This ZIP$62,873Maryland$103,678US $80,734
Median home value$262,300This ZIP$262,300Maryland$419,900US $332,700
Median gross rent$1,080This ZIP$1,080Maryland$1,705US $1,413
Bachelor's degree or higher20.7%This ZIP20.7%
Mean commute26.6 minThis ZIP26.6 min
Population density914.1 / sq miThis ZIP914.1 / sq mi

Business and tax activity

Business establishments1,814This ZIP1,814
Employees36,427This ZIP36,427
Annual payroll$1,657,896,000This ZIP$1,657,896,000
Tax returns filed30,400This ZIP30,400
Total adjusted gross income$1,678,435,000This ZIP$1,678,435,000

Land area

Land area70.88 sq miThis ZIP70.88 sq mi
Water area0.17 sq miThis ZIP0.17 sq mi

Other place names in 21740

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

ZIP codes near 21740

ZIPCityDistance
21741 Hagerstown, MD 1.4 mi
21747 Hagerstown, MD 1.4 mi
21749 Hagerstown, MD 1.4 mi
21734 Funkstown, MD 2.8 mi
21781 Saint James, MD 4.3 mi
21767 Maugansville, MD 4.6 mi
21746 Hagerstown, MD 4.8 mi
21795 Williamsport, MD 5.5 mi
21733 Fairplay, MD 5.7 mi
21721 Chewsville, MD 5.7 mi

Find every ZIP code within 10 miles of 21740 →

Questions about this ZIP code

Where is ZIP code 21740?

21740 is in Hagerstown, Maryland, in Washington County, part of the Hagerstown-Martinsburg, MD-WV metropolitan area. Its published point location is 39.6319, -77.7439.

What county is 21740 in?

21740 lies in Washington County.

What area code is 21740?

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

What time zone is 21740 in?

21740 uses America/New_York.

How many people live in 21740?

About 64,792 people live in ZIP code 21740, in 25,276 households, at 914.1 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 21740?

$62,873 a year, against $103,678 across Maryland.

What ZIP codes are near 21740?

The closest are 21741 (1.4 mi), 21747 (1.4 mi), 21749 (1.4 mi), 21734 (2.8 mi) and 21781 (4.3 mi).

Is 21740 a PO Box ZIP code?

21740 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21740 ZIP Code — Hagerstown, Maryland (Washington County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21740

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