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/48121

48121

ZIP 48121 is in Dearborn, Michigan, in Wayne County; Eastern time. Dearborn has 6 ZIP codes; the others are 48120, 48123, 48124, 48126 and 48128.

Type
No street area
Time zone
America/Detroit
County
Wayne
Coordinates
42.2399, -83.1508

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 48229, whose figures describe that area — not this ZIP code.

☼ Live from 48121 — Dearborn, MI

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 48121 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 48121
  • 🔢 Type 48121 into a pocket calculator and turn it upside down: IZIBh — not quite a word, sorry.
  • ➕ 48121 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1011101111111001
  • 🏠 Its numerical neighbours: 48120 (Dearborn, MI, 4 mi away) and 48122 (Melvindale, MI, 3 mi away).
  • 🔄 Backwards, 48121 becomes 12184 — and that is a real ZIP code: Valatie, NY, 485 miles away.
  • 👥 28 other ZIP codes are made of exactly the same digits (11428, 12148, 12184, 12418, 12481, 12814, …). The farthest-flung twin is 84112 in Salt Lake City, UT, 1,481 miles away.
  • 🧭 Farther north than 77% of all ZIP codes, and farther east than 62%.
  • 🎯820 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 48121 and you would come out at 42.24°S, 96.85°E — 1,261 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 16m of daylight. Shortest: 9h 05m.
🌙 The sky over 48121 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments30This ZIP30
Employees4,573This ZIP4,573
Annual payroll$438,043,000This ZIP$438,043,000

Land area

ZIP codes near 48121

ZIPCityDistance
48123 Dearborn, MI 0.0 mi
48136 Garden City, MI 0.0 mi
48222 Detroit, MI 0.0 mi
48244 Detroit, MI 0.0 mi
48260 Detroit, MI 0.0 mi
48265 Detroit, MI 0.0 mi
48266 Detroit, MI 0.0 mi
48277 Detroit, MI 0.0 mi
48278 Detroit, MI 0.0 mi
48288 Detroit, MI 0.0 mi

Find every ZIP code within 10 miles of 48121 →

Questions about this ZIP code

Where is ZIP code 48121?

48121 is in Dearborn, Michigan, in Wayne County, part of the Detroit-Warren-Dearborn, MI metropolitan area. Its published point location is 42.2399, -83.1508.

What county is 48121 in?

48121 lies in Wayne County.

What time zone is 48121 in?

48121 uses America/Detroit.

What ZIP codes are near 48121?

The closest are 48123 (0 mi), 48136 (0 mi), 48222 (0 mi), 48244 (0 mi) and 48260 (0 mi).

Is 48121 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

Download or cite

Cite this page

zipcodes.pro. “48121 ZIP Code — Dearborn, Michigan (Wayne County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/48121

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/48121.json

Underlying data is public domain or openly licensed — sources, vintages and licences.