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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/21804

21804

ZIP 21804 is in Salisbury, Maryland, mostly in Wicomico County; area codes 410, 667 and 443; Eastern time. Salisbury has 4 ZIP codes; the others are 21801, 21802 and 21803.

Type
Standard
Time zone
America/New_York
County
Wicomico +1 more
Metro area
Salisbury, MD
Population
40,430
Coordinates
38.3141, -75.5321
☼ Live from 21804 — Salisbury, MD

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Local time: —

Where 21804 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 21804
  • 🔢 Type 21804 into a pocket calculator and turn it upside down: hOBIZ — not quite a word, sorry.
  • ➕ As a number, 21,804 = 2 × 2 × 3 × 23 × 79. Its digits add up to 15, a total 1,657 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010100101100
  • 🏠 Its numerical neighbours: 21803 (Salisbury, MD, 7 mi away) and 21810 (Allen, MD, 9 mi away).
  • 🔄 Backwards, 21804 becomes 40812, which is not a ZIP code at all.
  • 👥 58 other ZIP codes are made of exactly the same digits (01824, 01842, 02148, 02184, 02481, 02814, …). The farthest-flung twin is 84120 in West Valley City, UT, 1,937 miles away.
  • 🧭 Farther south than 56% of all ZIP codes, and farther east than 86%.
  • 🎯1,237 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21804 and you would come out at 38.31°S, 104.47°E — 779 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 50m of daylight. Shortest: 9h 30m.
  • 📏 At 68.6 square miles of land, 21804 is bigger than 68% of ZIP codes — room for about 52 Central Parks.
🌙 The sky over 21804 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population40,430This ZIP40,430
Households15,707This ZIP15,707
Housing units17,049This ZIP17,049
Median age32.6This ZIP32.6Maryland39.4US 38.9
Median household income$73,156This ZIP$73,156Maryland$103,678US $80,734
Median home value$243,700This ZIP$243,700Maryland$419,900US $332,700
Median gross rent$1,432This ZIP$1,432Maryland$1,705US $1,413
Bachelor's degree or higher28.2%This ZIP28.2%
Mean commute22.3 minThis ZIP22.3 min
Population density589.7 / sq miThis ZIP589.7 / sq mi

Business and tax activity

Business establishments833This ZIP833
Employees10,904This ZIP10,904
Annual payroll$595,736,000This ZIP$595,736,000
Tax returns filed19,080This ZIP19,080
Total adjusted gross income$1,048,444,000This ZIP$1,048,444,000

Land area

Land area68.56 sq miThis ZIP68.56 sq mi
Water area0.45 sq miThis ZIP0.45 sq mi

Counties 21804 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Wicomico County 77.6%
Worcester County 22.4%

Other place names in 21804

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

ZIP codes near 21804

ZIPCityDistance
21826 Fruitland, MD 5.1 mi
21849 Parsonsburg, MD 5.4 mi
21822 Eden, MD 7.2 mi
21802 Salisbury, MD 7.3 mi
21803 Salisbury, MD 7.3 mi
21850 Pittsville, MD 8.0 mi
21801 Salisbury, MD 8.3 mi
21852 Powellville, MD 8.5 mi
21810 Allen, MD 8.7 mi
21875 Delmar, MD 8.7 mi

Find every ZIP code within 10 miles of 21804 →

Questions about this ZIP code

Where is ZIP code 21804?

21804 is in Salisbury, Maryland, in Wicomico County, part of the Salisbury, MD metropolitan area. Its published point location is 38.3141, -75.5321.

What county is 21804 in?

21804 spans 2 counties: Wicomico County and Worcester County. Most of it falls in Wicomico County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 21804?

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

What time zone is 21804 in?

21804 uses America/New_York.

How many people live in 21804?

About 40,430 people live in ZIP code 21804, in 15,707 households, at 589.7 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 21804?

$73,156 a year, against $103,678 across Maryland.

What ZIP codes are near 21804?

The closest are 21826 (5.1 mi), 21849 (5.4 mi), 21822 (7.2 mi), 21802 (7.3 mi) and 21803 (7.3 mi).

Is 21804 a PO Box ZIP code?

21804 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21804 ZIP Code — Salisbury, Maryland (Wicomico County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21804

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