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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/21677

21677

ZIP 21677 is Woolford, Maryland, in Dorchester County; area codes 443, 667 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Dorchester
Metro area
Cambridge, MD
Population
436
Coordinates
38.4722, -76.1738
☼ Live from 21677 — Woolford, MD

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Local time: —

Where 21677 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 21677
  • 🔢 Type 21677 into a pocket calculator and turn it upside down: LLgIZ — not quite a word, sorry.
  • ➕ As a number, 21,677 = 53 × 409. Its digits add up to 23, a total 2,533 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010010101101
  • 🏠 Its numerical neighbours: 21676 (Wittman, MD, 23 mi away) and 21678 (Worton, MD, 58 mi away).
  • 🔄 Backwards, 21677 becomes 77612 — and that is a real ZIP code: Buna, TX, 1,153 miles away.
  • 👥 29 other ZIP codes are made of exactly the same digits (12767, 12776, 16727, 17267, 17726, 17762, …). The farthest-flung twin is 76712 in Woodway, TX, 1,283 miles away.
  • 🧭 Farther south than 55% of all ZIP codes, and farther east than 84%.
  • 🎯1,201 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21677 and you would come out at 38.47°S, 103.83°E — 814 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 29m.
  • 📏 At 13.1 square miles of land, 21677 is bigger than 31% of ZIP codes — room for about 9.9 Central Parks.
🌙 The sky over 21677 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population436This ZIP436
Households182This ZIP182
Housing units231This ZIP231
Median age48.6This ZIP48.6Maryland39.4US 38.9
Median home value$328,600This ZIP$328,600Maryland$419,900US $332,700
Bachelor's degree or higher21.6%This ZIP21.6%
Mean commute57.7 minThis ZIP57.7 min
Population density33.3 / sq miThis ZIP33.3 / sq mi

Business and tax activity

Business establishments8This ZIP8
Employees43This ZIP43
Annual payroll$3,090,000This ZIP$3,090,000
Tax returns filed220This ZIP220
Total adjusted gross income$25,034,000This ZIP$25,034,000

Land area

Land area13.10 sq miThis ZIP13.10 sq mi
Water area1.43 sq miThis ZIP1.43 sq mi

Other place names in 21677

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

ZIP codes near 21677

ZIPCityDistance
21622 Church Creek, MD 4.1 mi
21648 Madison, MD 4.4 mi
21613 Cambridge, MD 5.6 mi
21669 Taylors Island, MD 6.6 mi
21626 Crapo, MD 10.6 mi
21634 Fishing Creek, MD 12.9 mi
21675 Wingate, MD 13.5 mi
21835 Linkwood, MD 13.6 mi
21673 Trappe, MD 13.7 mi
21631 East New Market, MD 14.8 mi

Find every ZIP code within 10 miles of 21677 →

Questions about this ZIP code

Where is ZIP code 21677?

21677 is in Woolford, Maryland, in Dorchester County, part of the Cambridge, MD micropolitan area. Its published point location is 38.4722, -76.1738.

What county is 21677 in?

21677 lies in Dorchester County.

What area code is 21677?

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

What time zone is 21677 in?

21677 uses America/New_York.

How many people live in 21677?

About 436 people live in ZIP code 21677, in 182 households, at 33.3 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What ZIP codes are near 21677?

The closest are 21622 (4.1 mi), 21648 (4.4 mi), 21613 (5.6 mi), 21669 (6.6 mi) and 21626 (10.6 mi).

Is 21677 a PO Box ZIP code?

21677 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21677 ZIP Code — Woolford, Maryland (Dorchester County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21677

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