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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/55609

55609

ZIP 55609 is Knife River, Minnesota, in Lake County; area code 218; Central time.

Type
Standard
Time zone
America/Chicago
County
Lake
Metro area
none
Population
131
Coordinates
46.9665, -91.7888
☼ Live from 55609 — Knife River, MN

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Local time: —

Where 55609 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 55609
  • 🔢 Type 55609 into a pocket calculator and turn it upside down: GOgSS — not quite a word, sorry.
  • ➕ 55609 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 25, a total 2,242 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 1101100100111001
  • 🏠 Its numerical neighbours: 55607 (Isabella, MN, 47 mi away) and 55612 (Lutsen, MN, 76 mi away).
  • 🔄 Backwards, 55609 becomes 90655, which is not a ZIP code at all.
  • 👥 20 other ZIP codes are made of exactly the same digits (09655, 50569, 50659, 55069, 55906, 55960, …). The farthest-flung twin is 96550 in FPO AA, a military post office, 10,184 miles away.
  • 🧭 Farther north than 95% of all ZIP codes, and farther west than 60%.
  • 🎯599 miles northeast of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 55609 and you would come out at 46.97°S, 88.21°E — 843 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 53m of daylight. Shortest: 8h 31m.
  • 📏 At 2.5 square miles of land, 55609 is bigger than 13% of ZIP codes — room for about 1.9 Central Parks.
🌙 The sky over 55609 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population131This ZIP131
Households75This ZIP75
Housing units127This ZIP127
Median age87.7This ZIP87.7Minnesota38.8US 38.9
Median household income$78,208This ZIP$78,208Minnesota$89,062US $80,734
Bachelor's degree or higher48.1%This ZIP48.1%
Population density52.5 / sq miThis ZIP52.5 / sq mi

Business and tax activity

Business establishments10This ZIP10
Employees102This ZIP102
Annual payroll$3,932,000This ZIP$3,932,000

Land area

Land area2.49 sq miThis ZIP2.49 sq mi
Water area0.02 sq miThis ZIP0.02 sq mi

Other place names in 55609

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

ZIP codes near 55609

ZIPCityDistance
55804 Duluth, MN 7.4 mi
55803 Duluth, MN 14.2 mi
55812 Duluth, MN 17.2 mi
55805 Duluth, MN 18.4 mi
55801 Duluth, MN 19.6 mi
55815 Duluth, MN 19.6 mi
55816 Duluth, MN 19.6 mi
55802 Duluth, MN 19.7 mi
55616 Two Harbors, MN 20.2 mi
55806 Duluth, MN 21.1 mi

Find every ZIP code within 10 miles of 55609 →

Questions about this ZIP code

Where is ZIP code 55609?

55609 is in Knife River, Minnesota, in Lake County. Its published point location is 46.9665, -91.7888.

What county is 55609 in?

55609 lies in Lake County.

What area code is 55609?

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

What time zone is 55609 in?

55609 uses America/Chicago.

How many people live in 55609?

About 131 people live in ZIP code 55609, in 75 households, at 52.5 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 55609?

$78,208 a year, against $89,062 across Minnesota.

What ZIP codes are near 55609?

The closest are 55804 (7.4 mi), 55803 (14.2 mi), 55812 (17.2 mi), 55805 (18.4 mi) and 55801 (19.6 mi).

Is 55609 a PO Box ZIP code?

55609 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “55609 ZIP Code — Knife River, Minnesota (Lake County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/55609

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