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/540

ZIP codes starting with 540

ZIP codes
25
States
WI
Largest city
Hudson, WI
Population
161,806

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 540xx

ZIP codes starting with 540
ZIP City Type Population Median income Median home
54001 Amery , WI Standard 7,906 $80,344 $286,800
54002 Baldwin , WI Standard 6,872 $88,275 $309,200
54003 Beldenville , WI Standard 1,065 $94,352 $343,900
54004 Clayton , WI Standard 2,192 $68,182 $240,600
54005 Clear Lake , WI Standard 3,264 $87,813 $274,300
54006 Cushing , WI Standard 852 $69,688 $204,300
54007 Deer Park , WI Standard 1,175 $85,398 $309,400
54009 Dresser , WI Standard 2,739 $89,861 $249,300
54010 East Ellsworth , WI No street area — — —
54011 Ellsworth , WI Standard 7,054 $102,636 $305,500
54013 Glenwood City , WI Standard 3,443 $87,500 $307,600
54014 Hager City , WI Standard 2,026 $101,667 $302,900
54015 Hammond , WI Standard 4,086 $114,293 $326,500
54016 Hudson , WI Standard 33,398 $113,085 $452,000
54017 New Richmond , WI Standard 20,366 $98,571 $321,700
54020 Osceola , WI Standard 7,687 $74,702 $306,500
54021 Prescott , WI Standard 7,346 $97,321 $365,300
54022 River Falls , WI Standard 24,789 $96,642 $373,100
54023 Roberts , WI Standard 4,620 $108,466 $385,100
54024 Saint Croix Falls , WI Standard 5,035 $75,417 $271,900
54025 Somerset , WI Standard 7,612 $86,930 $386,500
54026 Star Prairie , WI Standard 2,361 $95,833 $342,200
54027 Wilson , WI Standard 1,154 $100,750 $325,900
54028 Woodville , WI Standard 2,574 $85,341 $269,300
54082 Houlton , WI Standard 2,190 $131,146 $476,200

Cite this page

zipcodes.pro. “ZIP codes starting with 540.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/540

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