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/21798

21798

ZIP 21798 is Woodsboro, Maryland, in Frederick County; Eastern time.

Type
Standard
Time zone
America/New_York
County
Frederick
Population
2,928
Coordinates
39.5378, -77.2951
☼ Live from 21798 — Woodsboro, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 21798 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 21798
  • 🔢 Type 21798 into a pocket calculator and turn it upside down: BGLIZ — not quite a word, sorry.
  • ➕ As a number, 21,798 = 2 × 3 × 3 × 7 × 173. Its digits add up to 27, a total 1,806 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010100100110
  • 🏠 Its numerical neighbours: 21797 (Woodbine, MD, 19 mi away) and 21801 (Salisbury, MD, 120 mi away).
  • 🔄 Backwards, 21798 becomes 89712 — and that is a real ZIP code: Carson City, NV, 2,248 miles away.
  • 👥 36 other ZIP codes are made of exactly the same digits (12789, 12879, 12978, 12987, 17829, 17982, …). The farthest-flung twin is 97128 in Mcminnville, OR, 2,347 miles away.
  • 🧭 Farther north than 52% of all ZIP codes, and farther east than 80%.
  • 🎯1,129 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21798 and you would come out at 39.54°S, 102.70°E — 903 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
  • 📏 At 16.3 square miles of land, 21798 is bigger than 34% of ZIP codes — room for about 12 Central Parks.
🌙 The sky over 21798 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,928This ZIP2,928
Households929This ZIP929
Housing units1,031This ZIP1,031
Median age41.3This ZIP41.3Maryland39.4US 38.9
Median household income$116,607This ZIP$116,607Maryland$103,678US $80,734
Median home value$498,400This ZIP$498,400Maryland$419,900US $332,700
Median gross rent$1,406This ZIP$1,406Maryland$1,705US $1,413
Bachelor's degree or higher37.4%This ZIP37.4%
Mean commute30.5 minThis ZIP30.5 min
Population density179.7 / sq miThis ZIP179.7 / sq mi

Business and tax activity

Business establishments50This ZIP50
Employees428This ZIP428
Annual payroll$23,982,000This ZIP$23,982,000
Tax returns filed1,240This ZIP1,240
Total adjusted gross income$117,994,000This ZIP$117,994,000

Land area

Land area16.30 sq miThis ZIP16.30 sq mi
Water area0.05 sq miThis ZIP0.05 sq mi

Other place names in 21798

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

ZIP codes near 21798

ZIPCityDistance
21775 New Midway, MD 1.8 mi
21759 Ladiesburg, MD 2.2 mi
21793 Walkersville, MD 4.3 mi
21757 Keymar, MD 4.3 mi
21762 Libertytown, MD 4.7 mi
21778 Rocky Ridge, MD 5.7 mi
21791 Union Bridge, MD 5.7 mi
21701 Frederick, MD 6.8 mi
21709 Frederick, MD 7.0 mi
21792 Unionville, MD 7.3 mi

Find every ZIP code within 10 miles of 21798 →

Questions about this ZIP code

Where is ZIP code 21798?

21798 is in Woodsboro, Maryland, in Frederick County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.5378, -77.2951.

What county is 21798 in?

21798 lies in Frederick County.

What time zone is 21798 in?

21798 uses America/New_York.

How many people live in 21798?

About 2,928 people live in ZIP code 21798, in 929 households, at 179.7 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 21798?

$116,607 a year, against $103,678 across Maryland.

What ZIP codes are near 21798?

The closest are 21775 (1.8 mi), 21759 (2.2 mi), 21793 (4.3 mi), 21757 (4.3 mi) and 21762 (4.7 mi).

Is 21798 a PO Box ZIP code?

21798 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “21798 ZIP Code — Woodsboro, Maryland (Frederick County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21798

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21798.json

Underlying data is public domain or openly licensed — sources, vintages and licences.