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 — PREFIX/556

ZIP codes starting with 556

ZIP codes
13
States
MN
Largest city
Two Harbors, MN
Population
16,657

The first three digits of a ZIP code identify a sectional center facility — the postal processing plant that sorts mail for the area. It is a mail-routing grouping, not an administrative boundary.

Every ZIP code in 556xx

ZIP codes starting with 556
ZIP City Type Population Median income Median home
55601 Beaver Bay , MN Standard 128 $56,250 $242,400
55602 Brimson , MN Standard 346 $73,750 $247,600
55603 Finland , MN Standard 490 $61,875 $216,700
55604 Grand Marais , MN Standard 3,719 $73,427 $352,500
55605 Grand Portage , MN Standard 572 $56,250 $140,200
55606 Hovland , MN Standard 198 $85,000 $317,900
55607 Isabella , MN Standard 192 $87,857 $213,200
55609 Knife River , MN Standard 131 $78,208 —
55612 Lutsen , MN Standard 535 $81,042 $415,400
55613 Schroeder , MN Standard 232 $58,958 $405,600
55614 Silver Bay , MN Standard 2,485 $72,981 $181,700
55615 Tofte , MN Standard 379 $61,042 $276,100
55616 Two Harbors , MN Standard 7,250 $76,127 $259,200

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zipcodes.pro. “ZIP codes starting with 556.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/556

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