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 — STATE/IA/COUNTY/WINNESHIEK

Winneshiek County, IA ZIP codes

There are 8 ZIP codes in Winneshiek County, IA, in 8 towns, from 52101 to 52168. The largest are 52101 (Decorah), 52132 (Calmar) and 52161 (Ossian). 1 more crosses into it from a neighbouring county: 52136.

The county seat is Decorah.

ZIP codes
8
Partly in it
1 more
Towns
8
County seat
Decorah
County FIPS
19191
State
Iowa
Population
19,873
Median household income
$79,066
Land area
690 sq mi
Area code
563

Winneshiek County ZIP codes by town

Decorah (county seat)
52101

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Winneshiek County

This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Winneshiek County.

Map of Winneshiek County ZIP codes

5210152132521335214452149521615216552168

The ZIP codes of Winneshiek County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Winneshiek County in numbers

About 19,873 people live in Winneshiek County, in 8,139 households, the 34th most populous of Iowa's 99 counties. The median household income is $79,066 a year, 5% above the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $259,200 (25% above the Iowa median), and median gross rent is $861 a month. The median age is 42.6; 31.2% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 18 minutes.

Population19,873Winneshiek19,873
Households8,139Winneshiek8,139
Median age42.6Winneshiek42.6Iowa38.6US 38.9
Median household income$79,066Winneshiek$79,066Iowa$75,059US $80,734
Median home value$259,200Winneshiek$259,200Iowa$208,000US $332,700
Median gross rent$861Winneshiek$861Iowa$972US $1,413
Bachelor's degree or higher31.2%Winneshiek31.2%Iowa31.4%US 35.7%
Mean commute18.1 minWinneshiek18.1 minIowa19.8 minUS 26.4 min
Population density29 / sq miWinneshiek29 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Winneshiek County

Largest towns in Winneshiek County
TownZIP codesPopulation
Decorah 1 7,535
Calmar 1 974
Ossian 1 806
Spillville 1 356
Fort Atkinson 1 346
Ridgeway 1 315
Castalia 1 142

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Winneshiek County.

Not sure you are in Winneshiek County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Winneshiek County, with figures

ZIP codes in Winneshiek County
ZIP City Type Population Median income Median home
52101 Decorah , IA Standard 12,706 $73,484 $273,200
52132 Calmar , IA Standard 1,759 $100,559 $231,600
52133 Castalia , IA Standard 673 $76,250 $246,100
52144 Fort Atkinson , IA Standard 1,075 $84,609 $217,500
52149 Highlandville , IA No street area — — —
52161 Ossian , IA Standard 1,532 $87,870 $171,400
52165 Ridgeway , IA Standard 1,098 $85,227 $292,200
52168 Spillville , IA Standard 356 $54,375 $157,500

Cite this page

zipcodes.pro. “Winneshiek County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ia/county/winneshiek

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