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/21405

21405

ZIP 21405 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
495
Coordinates
39.0281, -76.5480
☼ Live from 21405 — Annapolis, MD

Weather right now

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Local time: —

Where 21405 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 21405
  • 🔢 Type 21405 into a pocket calculator and turn it upside down: SOhIZ — not quite a word, sorry.
  • ➕ As a number, 21,405 = 3 × 5 × 1427. Its digits add up to 12, a total 940 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001110011101
  • 🏠 Its numerical neighbours: 21404 (Annapolis, MD, 5 mi away) and 21409 (Annapolis, MD, 6 mi away).
  • 🔄 Backwards, 21405 becomes 50412, which is not a ZIP code at all.
  • 👥 73 other ZIP codes are made of exactly the same digits (01245, 01254, 01452, 01524, 01542, 02145, …). The farthest-flung twin is 51240 in Inwood, IA, 1,074 miles away.
  • 🧭 Farther south than 50% 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 21405 and you would come out at 39.03°S, 103.45°E — 851 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.
  • 📏 At 1.0 square miles of land, 21405 is bigger than 8% of ZIP codes — about 495 football fields.
🌙 The sky over 21405 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population495This ZIP495
Households221This ZIP221
Housing units338This ZIP338
Median age64.5This ZIP64.5Maryland39.4US 38.9
Median household income$160,703This ZIP$160,703Maryland$103,678US $80,734
Median home value$986,100This ZIP$986,100Maryland$419,900US $332,700
Bachelor's degree or higher74.9%This ZIP74.9%
Mean commute34.1 minThis ZIP34.1 min
Population density483.9 / sq miThis ZIP483.9 / sq mi

Business and tax activity

Business establishments9This ZIP9
Employees64This ZIP64
Annual payroll$2,290,000This ZIP$2,290,000

Land area

Land area1.02 sq miThis ZIP1.02 sq mi
Water area0.89 sq miThis ZIP0.89 sq mi

ZIP codes near 21405

ZIPCityDistance
21401 Annapolis, MD 2.8 mi
21032 Crownsville, MD 3.0 mi
21012 Arnold, MD 3.1 mi
21146 Severna Park, MD 3.6 mi
21062 Glen Burnie, MD 4.5 mi
21123 Pasadena, MD 4.5 mi
21411 Annapolis, MD 4.5 mi
21412 Annapolis, MD 4.5 mi
21404 Annapolis, MD 4.6 mi
21402 Annapolis, MD 5.0 mi

Find every ZIP code within 10 miles of 21405 →

Questions about this ZIP code

Where is ZIP code 21405?

21405 is in Annapolis, Maryland, in Anne Arundel County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.0281, -76.5480.

What county is 21405 in?

21405 lies in Anne Arundel County.

What area code is 21405?

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

What time zone is 21405 in?

21405 uses America/New_York.

How many people live in 21405?

About 495 people live in ZIP code 21405, in 221 households, at 483.9 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 21405?

$160,703 a year, against $103,678 across Maryland.

What ZIP codes are near 21405?

The closest are 21401 (2.8 mi), 21032 (3 mi), 21012 (3.1 mi), 21146 (3.6 mi) and 21062 (4.5 mi).

Is 21405 a PO Box ZIP code?

21405 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21405 ZIP Code — Annapolis, Maryland (Anne Arundel County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21405

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