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zipcodes.pro — ZIP/21904

21904

ZIP 21904 is Port Deposit, Maryland, in Cecil County; area codes 443, 667 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Cecil
Population
6,233
Coordinates
39.6155, -76.0680
☼ Live from 21904 — Port Deposit, MD

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Local time: —

Where 21904 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 21904
  • 🔢 Type 21904 into a pocket calculator and turn it upside down: hOGIZ — not quite a word, sorry.
  • ➕ As a number, 21,904 = 2 × 2 × 2 × 2 × 37 × 37. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010110010000
  • 🏠 Its numerical neighbours: 21903 (Perryville, MD, 3 mi away) and 21911 (Rising Sun, MD, 6 mi away).
  • 🔄 Backwards, 21904 becomes 40912, which is not a ZIP code at all.
  • 👥 56 other ZIP codes are made of exactly the same digits (02149, 02914, 04219, 04291, 04912, 04921, …). The farthest-flung twin is 09142 in APO AE, a military post office, 4,104 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 85%.
  • 🎯1,193 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21904 and you would come out at 39.62°S, 103.93°E — 852 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
  • 📏 At 23.6 square miles of land, 21904 is bigger than 41% of ZIP codes — room for about 18 Central Parks.
🌙 The sky over 21904 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population6,233This ZIP6,233
Households2,269This ZIP2,269
Housing units2,622This ZIP2,622
Median age39.7This ZIP39.7Maryland39.4US 38.9
Median household income$88,136This ZIP$88,136Maryland$103,678US $80,734
Median home value$333,500This ZIP$333,500Maryland$419,900US $332,700
Median gross rent$1,422This ZIP$1,422Maryland$1,705US $1,413
Bachelor's degree or higher28.0%This ZIP28.0%
Mean commute29.6 minThis ZIP29.6 min
Population density264.1 / sq miThis ZIP264.1 / sq mi

Business and tax activity

Business establishments78This ZIP78
Employees513This ZIP513
Annual payroll$22,783,000This ZIP$22,783,000
Tax returns filed3,340This ZIP3,340
Total adjusted gross income$269,187,000This ZIP$269,187,000

Land area

Land area23.60 sq miThis ZIP23.60 sq mi
Water area2.53 sq miThis ZIP2.53 sq mi

Other place names in 21904

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

ZIP codes near 21904

ZIPCityDistance
21903 Perryville, MD 3.1 mi
21917 Colora, MD 4.2 mi
21902 Perry Point, MD 4.4 mi
21914 Charlestown, MD 5.2 mi
21078 Havre De Grace, MD 5.5 mi
21911 Rising Sun, MD 5.8 mi
21901 North East, MD 5.8 mi
21918 Conowingo, MD 7.2 mi
21034 Darlington, MD 8.4 mi
19362 Nottingham, PA 9.3 mi

Find every ZIP code within 10 miles of 21904 →

Questions about this ZIP code

Where is ZIP code 21904?

21904 is in Port Deposit, Maryland, in Cecil County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 39.6155, -76.0680.

What county is 21904 in?

21904 lies in Cecil County.

What area code is 21904?

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

What time zone is 21904 in?

21904 uses America/New_York.

How many people live in 21904?

About 6,233 people live in ZIP code 21904, in 2,269 households, at 264.1 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 21904?

$88,136 a year, against $103,678 across Maryland.

What ZIP codes are near 21904?

The closest are 21903 (3.1 mi), 21917 (4.2 mi), 21902 (4.4 mi), 21914 (5.2 mi) and 21078 (5.5 mi).

Is 21904 a PO Box ZIP code?

21904 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21904 ZIP Code — Port Deposit, Maryland (Cecil County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21904

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