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/21829

21829

ZIP 21829 is Girdletree, Maryland, in Worcester County; area codes 410, 443 and 667; Eastern time.

Type
Standard
Time zone
America/New_York
County
Worcester
Metro area
Ocean Pines, MD
Population
396
Coordinates
38.0977, -75.3715
☼ Live from 21829 — Girdletree, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 21829 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 21829
  • 🔢 Type 21829 into a pocket calculator and turn it upside down: GZBIZ — not quite a word, sorry.
  • ➕ As a number, 21,829 = 83 × 263. Its digits add up to 22, a total 2,607 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010101000101
  • 🏠 Its numerical neighbours: 21826 (Fruitland, MD, 21 mi away) and 21830 (Hebron, MD, 29 mi away).
  • 🔄 Backwards, 21829 becomes 92812 — and that is a real ZIP code: Anaheim, CA, 2,378 miles away.
  • 👥 20 other ZIP codes are made of exactly the same digits (12928, 18229, 18922, 21289, 21298, 28129, …). The farthest-flung twin is 98221 in Anacortes, WA, 2,439 miles away.
  • 🧭 Farther south than 58% of all ZIP codes, and farther east than 87%.
  • 🎯1,249 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21829 and you would come out at 38.10°S, 104.63°E — 763 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 49m of daylight. Shortest: 9h 31m.
  • 📏 At 16.8 square miles of land, 21829 is bigger than 34% of ZIP codes — room for about 13 Central Parks.
🌙 The sky over 21829 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population396This ZIP396
Households199This ZIP199
Housing units227This ZIP227
Median age59.5This ZIP59.5Maryland39.4US 38.9
Median household income$71,359This ZIP$71,359Maryland$103,678US $80,734
Median home value$270,900This ZIP$270,900Maryland$419,900US $332,700
Bachelor's degree or higher26.2%This ZIP26.2%
Mean commute18.8 minThis ZIP18.8 min
Population density23.6 / sq miThis ZIP23.6 / sq mi

Business and tax activity

Business establishments8This ZIP8
Employees12This ZIP12
Annual payroll$440,000This ZIP$440,000
Tax returns filed230This ZIP230
Total adjusted gross income$13,252,000This ZIP$13,252,000

Land area

Land area16.76 sq miThis ZIP16.76 sq mi
Water area1.33 sq miThis ZIP1.33 sq mi

Other place names in 21829

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

ZIP codes near 21829

ZIPCityDistance
21864 Stockton, MD 4.9 mi
23356 Greenbackville, VA 6.1 mi
21863 Snow Hill, MD 6.4 mi
21851 Pocomoke City, MD 9.5 mi
23395 Horntown, VA 9.8 mi
21841 Newark, MD 10.0 mi
23336 Chincoteague Island, VA 10.4 mi
23337 Wallops Island, VA 12.0 mi
23415 New Church, VA 12.3 mi
23483 Wattsville, VA 12.8 mi

Find every ZIP code within 10 miles of 21829 →

Questions about this ZIP code

Where is ZIP code 21829?

21829 is in Girdletree, Maryland, in Worcester County, part of the Ocean Pines, MD micropolitan area. Its published point location is 38.0977, -75.3715.

What county is 21829 in?

21829 lies in Worcester County.

What area code is 21829?

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

What time zone is 21829 in?

21829 uses America/New_York.

How many people live in 21829?

About 396 people live in ZIP code 21829, in 199 households, at 23.6 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 21829?

$71,359 a year, against $103,678 across Maryland.

What ZIP codes are near 21829?

The closest are 21864 (4.9 mi), 23356 (6.1 mi), 21863 (6.4 mi), 21851 (9.5 mi) and 23395 (9.8 mi).

Is 21829 a PO Box ZIP code?

21829 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “21829 ZIP Code — Girdletree, Maryland (Worcester County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21829

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21829.json

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