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/21777

21777

ZIP 21777 is Point Of Rocks, Maryland, in Frederick County; area codes 240, 301 and 227; Eastern time.

Type
Standard
Time zone
America/New_York
County
Frederick
Population
2,462
Coordinates
39.2793, -77.5287
☼ Live from 21777 — Point Of Rocks, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 21777 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 21777
  • 🔢 Type 21777 into a pocket calculator and turn it upside down: LLLIZ — not quite a word, sorry.
  • ➕ As a number, 21,777 = 3 × 7 × 17 × 61. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010100010001
  • 🏠 Its numerical neighbours: 21776 (New Windsor, MD, 28 mi away) and 21778 (Rocky Ridge, MD, 26 mi away).
  • 🔄 Backwards, 21777 becomes 77712, which is not a ZIP code at all.
  • 👥 9 other ZIP codes are made of exactly the same digits (12777, 17727, 17772, 27717, 71277, 71772, …). The farthest-flung twin is 77217 in Houston, TX, 1,206 miles away.
  • 🧭 Farther north than 51% of all ZIP codes, and farther east than 80%.
  • 🎯1,119 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21777 and you would come out at 39.28°S, 102.47°E — 905 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 56m of daylight. Shortest: 9h 24m.
  • 📏 At 1.1 square miles of land, 21777 is bigger than 8% of ZIP codes — about 531 football fields.
🌙 The sky over 21777 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,462This ZIP2,462
Households817This ZIP817
Housing units817This ZIP817
Median age43.8This ZIP43.8Maryland39.4US 38.9
Median household income$159,708This ZIP$159,708Maryland$103,678US $80,734
Median home value$480,500This ZIP$480,500Maryland$419,900US $332,700
Bachelor's degree or higher44.8%This ZIP44.8%
Mean commute43.6 minThis ZIP43.6 min
Population density2,242.3 / sq miThis ZIP2,242.3 / sq mi

Business and tax activity

Business establishments25This ZIP25
Employees552This ZIP552
Annual payroll$55,688,000This ZIP$55,688,000
Tax returns filed880This ZIP880
Total adjusted gross income$99,674,000This ZIP$99,674,000

Land area

Land area1.10 sq miThis ZIP1.10 sq mi
Water area0.00 sq mi

Other place names in 21777

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

ZIP codes near 21777

ZIPCityDistance
21790 Tuscarora, MD 1.8 mi
21710 Adamstown, MD 5.5 mi
20180 Lovettsville, VA 5.9 mi
21716 Brunswick, MD 5.9 mi
21755 Jefferson, MD 5.9 mi
21717 Buckeystown, MD 6.6 mi
21703 Frederick, MD 6.7 mi
20176 Leesburg, VA 6.8 mi
20197 Waterford, VA 7.9 mi
20842 Dickerson, MD 8.2 mi

Find every ZIP code within 10 miles of 21777 →

Questions about this ZIP code

Where is ZIP code 21777?

21777 is in Point Of Rocks, Maryland, in Frederick County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 39.2793, -77.5287.

What county is 21777 in?

21777 lies in Frederick County.

What area code is 21777?

Point Of Rocks uses area codes 240, 301 and 227, from NANPA's telephone records.

What time zone is 21777 in?

21777 uses America/New_York.

How many people live in 21777?

About 2,462 people live in ZIP code 21777, in 817 households, at 2,242.3 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 21777?

$159,708 a year, against $103,678 across Maryland.

What ZIP codes are near 21777?

The closest are 21790 (1.8 mi), 21710 (5.5 mi), 20180 (5.9 mi), 21716 (5.9 mi) and 21755 (5.9 mi).

Is 21777 a PO Box ZIP code?

21777 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “21777 ZIP Code — Point Of Rocks, Maryland (Frederick County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21777

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21777.json

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