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/48321

48321

ZIP 48321 is in Auburn Hills, Michigan, in Oakland County; area codes 248 and 947; Eastern time. Auburn Hills has 2 ZIP codes; the other is 48326.

Type
No street area
Time zone
America/Detroit
County
Oakland
Coordinates
42.6601, -83.3863

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 48327, whose figures describe that area — not this ZIP code.

☼ Live from 48321 — Auburn Hills, MI

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Where 48321 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 48321
  • 🔢 Type 48321 into a pocket calculator and turn it upside down: IZEBh — not quite a word, sorry.
  • ➕ As a number, 48,321 = 3 × 3 × 7 × 13 × 59. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1011110011000001
  • 🏠 Its numerical neighbours: 48320 (Keego Harbor, MI, 4 mi away) and 48322 (West Bloomfield, MI, 8 mi away).
  • 🔄 Backwards, 48321 becomes 12384, which is not a ZIP code at all.
  • 👥 55 other ZIP codes are made of exactly the same digits (12438, 12483, 12834, 12843, 13428, 13482, …). The farthest-flung twin is 84123 in Salt Lake City, UT, 1,472 miles away.
  • 🧭 Farther north than 80% of all ZIP codes, and farther east than 62%.
  • 🎯812 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 48321 and you would come out at 42.66°S, 96.61°E — 1,286 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 19m of daylight. Shortest: 9h 02m.
🌙 The sky over 48321 today
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🌋 Shake report
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Source: USGS.

Business and tax activity

Business establishments9This ZIP9
Employees236This ZIP236
Annual payroll$9,708,000This ZIP$9,708,000

Land area

ZIP codes near 48321

ZIPCityDistance
48325 West Bloomfield, MI 0.0 mi
48347 Clarkston, MI 0.0 mi
48328 Waterford, MI 1.4 mi
48330 Drayton Plains, MI 1.6 mi
48329 Waterford, MI 1.9 mi
48327 Waterford, MI 1.9 mi
48320 Keego Harbor, MI 4.1 mi
48387 Union Lake, MI 4.4 mi
48324 West Bloomfield, MI 4.5 mi
48346 Clarkston, MI 4.5 mi

Find every ZIP code within 10 miles of 48321 →

Questions about this ZIP code

Where is ZIP code 48321?

48321 is in Auburn Hills, Michigan, in Oakland County, part of the Detroit-Warren-Dearborn, MI metropolitan area. Its published point location is 42.6601, -83.3863.

What county is 48321 in?

48321 lies in Oakland County.

What area code is 48321?

Auburn Hills uses area codes 248 and 947, from NANPA's telephone records.

What time zone is 48321 in?

48321 uses America/Detroit.

What ZIP codes are near 48321?

The closest are 48325 (0 mi), 48347 (0 mi), 48328 (1.4 mi), 48330 (1.6 mi) and 48329 (1.9 mi).

Is 48321 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.

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Cite this page

zipcodes.pro. “48321 ZIP Code — Auburn Hills, Michigan (Oakland County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/48321

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/48321.json

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