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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/21220

21220

ZIP 21220 is Middle River, Maryland, in Baltimore County; area codes 443, 667 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Baltimore
Population
42,824
Coordinates
39.3431, -76.3909
☼ Live from 21220 — Middle River, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
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Local time: —

Where 21220 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 21220
  • 🔢 Type 21220 into a pocket calculator and turn it upside down: OZZIZ — not quite a word, sorry.
  • ➕ As a number, 21,220 = 2 × 2 × 5 × 1061. Its digits add up to 7, a total 150 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001011100100
  • 🏠 Its numerical neighbours: 21219 (Sparrows Point, MD, 8 mi away) and 21221 (Essex, MD, 4 mi away).
  • 🔄 Backwards, 21220 becomes 02212 — and that is a real ZIP code: Boston, MA, 348 miles away.
  • 👥 14 other ZIP codes are made of exactly the same digits (01222, 02122, 02212, 12022, 12202, 12220, …). The farthest-flung twin is 02212 in Boston, MA, 348 miles away.
  • 🧭 Farther north than 51% of all ZIP codes, and farther east than 84%.
  • 🎯1,179 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21220 and you would come out at 39.34°S, 103.61°E — 855 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 57m of daylight. Shortest: 9h 23m.
  • 📏 At 21.2 square miles of land, 21220 is bigger than 38% of ZIP codes — room for about 16 Central Parks.
🌙 The sky over 21220 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population42,824This ZIP42,824
Households16,544This ZIP16,544
Housing units17,918This ZIP17,918
Median age37.7This ZIP37.7Maryland39.4US 38.9
Median household income$81,817This ZIP$81,817Maryland$103,678US $80,734
Median home value$300,100This ZIP$300,100Maryland$419,900US $332,700
Median gross rent$1,673This ZIP$1,673Maryland$1,705US $1,413
Bachelor's degree or higher30.0%This ZIP30.0%
Mean commute30.0 minThis ZIP30.0 min
Population density2,022.1 / sq miThis ZIP2,022.1 / sq mi

Business and tax activity

Business establishments697This ZIP697
Employees12,583This ZIP12,583
Annual payroll$797,515,000This ZIP$797,515,000
Tax returns filed22,000This ZIP22,000
Total adjusted gross income$1,524,887,000This ZIP$1,524,887,000

Land area

Land area21.18 sq miThis ZIP21.18 sq mi
Water area6.67 sq miThis ZIP6.67 sq mi

Other place names in 21220

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

ZIP codes near 21220

ZIPCityDistance
21027 Chase, MD 1.8 mi
21162 White Marsh, MD 3.3 mi
21221 Essex, MD 4.3 mi
21128 Perry Hall, MD 5.2 mi
21237 Rosedale, MD 5.6 mi
21236 Nottingham, MD 5.9 mi
21156 Upper Falls, MD 6.0 mi
21010 Gunpowder, MD 6.2 mi
21085 Joppa, MD 7.3 mi
21087 Kingsville, MD 7.4 mi

Find every ZIP code within 10 miles of 21220 →

Questions about this ZIP code

Where is ZIP code 21220?

21220 is in Middle River, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.3431, -76.3909.

What county is 21220 in?

21220 lies in Baltimore County.

What area code is 21220?

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

What time zone is 21220 in?

21220 uses America/New_York.

How many people live in 21220?

About 42,824 people live in ZIP code 21220, in 16,544 households, at 2,022.1 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 21220?

$81,817 a year, against $103,678 across Maryland.

What ZIP codes are near 21220?

The closest are 21027 (1.8 mi), 21162 (3.3 mi), 21221 (4.3 mi), 21128 (5.2 mi) and 21237 (5.6 mi).

Is 21220 a PO Box ZIP code?

21220 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21220 ZIP Code — Middle River, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21220

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