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 — RANKINGS/WI/SMALLEST-AREA

Smallest ZIP Codes in Wisconsin by Land Area

What this measures. Land area of the Census tabulation area, smallest first. These are almost always dense urban ZIP codes covering a few city blocks. Source: Census Gazetteer, data release 2026-10-12.

# ZIP City County Land area
1 53792 Madison Dane 0.03 sq mi
2 53962 Union Center Juneau 0.03 sq mi
3 53584 Sextonville Richland 0.04 sq mi
4 53940 Lake Delton Sauk 0.04 sq mi
5 53031 Hingham Sheboygan 0.04 sq mi
6 53157 Pell Lake Walworth 0.04 sq mi
7 54946 King Waupaca 0.07 sq mi
8 53540 Gotham Richland 0.08 sq mi
9 54857 Mikana Barron 0.08 sq mi
10 54307 Green Bay Brown 0.08 sq mi
11 54985 Winnebago Winnebago 0.09 sq mi
12 54760 Pigeon Falls Trempealeau 0.15 sq mi
13 53088 Stockbridge Calumet 0.15 sq mi
14 53003 Ashippun Dodge 0.17 sq mi
15 54464 Phlox Langlade 0.18 sq mi
16 54127 Green Valley Shawano 0.19 sq mi
17 54927 Butte Des Morts Winnebago 0.22 sq mi
18 53295 Milwaukee Milwaukee 0.24 sq mi
19 53599 Woodford Lafayette 0.24 sq mi
20 53099 Woodland Dodge 0.27 sq mi
21 54643 Millston Jackson 0.31 sq mi
22 54926 Big Falls Waupaca 0.32 sq mi
23 53195 Zenda Walworth 0.33 sq mi
24 53953 Packwaukee Marquette 0.34 sq mi
25 54637 Hustler Juneau 0.34 sq mi
26 53176 Springfield Walworth 0.35 sq mi
27 53947 Marquette Green Lake 0.35 sq mi
28 54980 Waukau Winnebago 0.35 sq mi
29 54654 Seneca Crawford 0.37 sq mi
30 53817 Patch Grove Grant 0.38 sq mi
31 53069 Okauchee Waukesha 0.39 sq mi
32 54417 Brokaw Marathon 0.40 sq mi
33 54215 Kellnersville Manitowoc 0.40 sq mi
34 53047 Lebanon Dodge 0.40 sq mi
35 53706 Madison Dane 0.42 sq mi
36 53571 Morrisonville Dane 0.43 sq mi
37 53167 Rochester Racine 0.44 sq mi
38 53203 Milwaukee Milwaukee 0.44 sq mi
39 54458 Nelsonville Portage 0.45 sq mi
40 53501 Afton Rock 0.46 sq mi
41 54214 Francis Creek Manitowoc 0.48 sq mi
42 54841 Haugen Barron 0.50 sq mi
43 53812 Kieler Grant 0.50 sq mi
44 54931 Dale Outagamie 0.50 sq mi
45 54160 Potter Calumet 0.51 sq mi
46 53726 Madison Dane 0.56 sq mi
47 54152 Nichols Outagamie 0.61 sq mi
48 53969 Wyocena Columbia 0.61 sq mi
49 53016 Clyman Dodge 0.61 sq mi
50 54645 Mount Sterling Crawford 0.69 sq mi

Showing the top 50 of 783 ZIP codes in Wisconsin that have this figure and meet the threshold above. 53792 ranks 1st at 0.03 sq mi, against 0.69 sq mi in 50th place.

Other rankings for Wisconsin

Cite this page

zipcodes.pro. “Smallest ZIP Codes in Wisconsin by Land Area.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/rankings/wi/smallest-area

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