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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/55815

55815

ZIP 55815 is in Duluth, Minnesota, in St. Louis County; area code 218; Central time. Duluth has 14 ZIP codes in all.

Type
No street area
Time zone
America/Chicago
County
St. Louis
Metro area
Duluth, MN-WI
Coordinates
46.7833, -92.1066

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 55802, whose figures describe that area — not this ZIP code.

☼ Live from 55815 — Duluth, MN

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Where 55815 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 55815
  • 🔢 Type 55815 into a pocket calculator and turn it upside down: SIBSS — not quite a word, sorry.
  • ➕ As a number, 55,815 = 3 × 5 × 61 × 61. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1101101000000111
  • 🏠 Its numerical neighbours: 55814 (Duluth, MN, 6 mi away) and 55816 (Duluth, MN, 0 mi away).
  • 🔄 Backwards, 55815 becomes 51855, which is not a ZIP code at all.
  • 👥 3 other ZIP codes are made of exactly the same digits (15558, 51558, 85551). The farthest-flung twin is 85551 in Solomon, AZ, 1,336 miles away.
  • 🧭 Farther north than 95% of all ZIP codes, and farther west than 61%.
  • 🎯580 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 55815 and you would come out at 46.78°S, 87.89°E — 833 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 52m of daylight. Shortest: 8h 32m.
🌙 The sky over 55815 today
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Source: USGS.

Land area

ZIP codes near 55815

ZIPCityDistance
55801 Duluth, MN 0.0 mi
55816 Duluth, MN 0.0 mi
55805 Duluth, MN 1.3 mi
55806 Duluth, MN 1.4 mi
55802 Duluth, MN 1.7 mi
55812 Duluth, MN 2.4 mi
55807 Duluth, MN 4.4 mi
55814 Duluth, MN 5.6 mi
55811 Duluth, MN 6.7 mi
55810 Duluth, MN 7.9 mi

Find every ZIP code within 10 miles of 55815 →

Questions about this ZIP code

Where is ZIP code 55815?

55815 is in Duluth, Minnesota, in St. Louis County, part of the Duluth, MN-WI metropolitan area. Its published point location is 46.7833, -92.1066.

What county is 55815 in?

55815 lies in St. Louis County.

What area code is 55815?

Duluth uses area code 218, from NANPA's telephone records.

What time zone is 55815 in?

55815 uses America/Chicago.

What ZIP codes are near 55815?

The closest are 55801 (0 mi), 55816 (0 mi), 55805 (1.3 mi), 55806 (1.4 mi) and 55802 (1.7 mi).

Is 55815 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. “55815 ZIP Code — Duluth, Minnesota (St. Louis County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/55815

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/55815.json

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