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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/21401

21401

ZIP 21401 is in Annapolis, Maryland, in Anne Arundel County; area codes 443, 410 and 667; Eastern time. Annapolis has 8 ZIP codes in all.

Type
Standard
Time zone
America/New_York
County
Anne Arundel
Population
38,629
Coordinates
38.9879, -76.5527
☼ Live from 21401 — Annapolis, MD

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Where 21401 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 21401
  • 🔢 Type 21401 into a pocket calculator and turn it upside down: IOhIZ — not quite a word, sorry.
  • ➕ 21401 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 8, a total 251 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001110011001
  • 🏠 Its numerical neighbours: 21298 (Baltimore, MD, 21 mi away) and 21402 (Annapolis, MD, 4 mi away).
  • 🔄 Backwards, 21401 becomes 10412, which is not a ZIP code at all.
  • 👥 34 other ZIP codes are made of exactly the same digits (02114, 02141, 04112, 04211, 10124, 11024, …). The farthest-flung twin is 42101 in Bowling Green, KY, 555 miles away.
  • 🧭 Farther south than 51% of all ZIP codes, and farther east than 83%.
  • 🎯1,174 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21401 and you would come out at 38.99°S, 103.45°E — 850 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 54m of daylight. Shortest: 9h 26m.
  • 📏 At 19.9 square miles of land, 21401 is bigger than 37% of ZIP codes — room for about 15 Central Parks.
🌙 The sky over 21401 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population38,629This ZIP38,629
Households17,984This ZIP17,984
Housing units19,567This ZIP19,567
Median age47.7This ZIP47.7Maryland39.4US 38.9
Median household income$123,381This ZIP$123,381Maryland$103,678US $80,734
Median home value$601,400This ZIP$601,400Maryland$419,900US $332,700
Median gross rent$2,150This ZIP$2,150Maryland$1,705US $1,413
Bachelor's degree or higher61.1%This ZIP61.1%
Mean commute28.4 minThis ZIP28.4 min
Population density1,938.1 / sq miThis ZIP1,938.1 / sq mi

Business and tax activity

Business establishments2,837This ZIP2,837
Employees44,530This ZIP44,530
Annual payroll$3,131,831,000This ZIP$3,131,831,000
Tax returns filed21,170This ZIP21,170
Total adjusted gross income$2,986,168,000This ZIP$2,986,168,000

Land area

Land area19.93 sq miThis ZIP19.93 sq mi
Water area2.27 sq miThis ZIP2.27 sq mi

Other place names in 21401

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

ZIP codes near 21401

ZIPCityDistance
21062 Glen Burnie, MD 2.5 mi
21123 Pasadena, MD 2.5 mi
21411 Annapolis, MD 2.5 mi
21412 Annapolis, MD 2.5 mi
21405 Annapolis, MD 2.8 mi
21140 Riva, MD 3.1 mi
21404 Annapolis, MD 3.3 mi
21032 Crownsville, MD 3.9 mi
21402 Annapolis, MD 4.4 mi
21403 Annapolis, MD 4.6 mi

Find every ZIP code within 10 miles of 21401 →

Questions about this ZIP code

Where is ZIP code 21401?

21401 is in Annapolis, Maryland, in Anne Arundel County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 38.9879, -76.5527.

What county is 21401 in?

21401 lies in Anne Arundel County.

What area code is 21401?

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

What time zone is 21401 in?

21401 uses America/New_York.

How many people live in 21401?

About 38,629 people live in ZIP code 21401, in 17,984 households, at 1,938.1 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 21401?

$123,381 a year, against $103,678 across Maryland.

What ZIP codes are near 21401?

The closest are 21062 (2.5 mi), 21123 (2.5 mi), 21411 (2.5 mi), 21412 (2.5 mi) and 21405 (2.8 mi).

Is 21401 a PO Box ZIP code?

21401 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “21401 ZIP Code — Annapolis, Maryland (Anne Arundel County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21401

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