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/IOWA

Iowa County, IA ZIP codes

There are 13 ZIP codes in Iowa County, IA, in 12 towns, from 52203 to 52361. The largest are 52361 (Williamsburg), 52301 (Marengo) and 52203 (Amana).

The county seat is Marengo.

ZIP codes
13
Towns
12
County seat
Marengo
County FIPS
19095
State
Iowa
Population
16,507
Median household income
$71,223
Land area
586 sq mi

Iowa County ZIP codes by town

Marengo (county seat)
52301

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.

Map of Iowa County ZIP codes

52203522045222052236522515230152307523085231652325523345234752361

The ZIP codes of Iowa 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.

Iowa County in numbers

About 16,507 people live in Iowa County, in 6,909 households, the 45th most populous of Iowa's 99 counties. The median household income is $71,223 a year, 5% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $193,900 (7% below the Iowa median), and median gross rent is $686 a month. The median age is 42.4; 24.8% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 22 minutes.

Population16,507Iowa16,507
Households6,909Iowa6,909
Median age42.4Iowa42.4Iowa38.6US 38.9
Median household income$71,223Iowa$71,223Iowa$75,059US $80,734
Median home value$193,900Iowa$193,900Iowa$208,000US $332,700
Median gross rent$686Iowa$686Iowa$972US $1,413
Bachelor's degree or higher24.8%Iowa24.8%Iowa31.4%US 35.7%
Mean commute22.2 minIowa22.2 minIowa19.8 minUS 26.4 min
Population density28 / sq miIowa28 / 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 Iowa County

Largest towns in Iowa County
TownZIP codesPopulation
Williamsburg 1 3,360
Marengo 1 2,725
Victor 1 987
North English 1 852
Amana 2 755
Middle Amana 1 683
Parnell 1 303
Homestead 1 252
Ladora 1 240
Conroy 1 199
Millersburg 1 129
South Amana 1 121

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 Iowa County.

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

Every ZIP code in Iowa County, with figures

ZIP codes in Iowa County
ZIP City Type Population Median income Median home
52203 Amana , IA Standard 2,231 $101,950 $297,100
52204 Amana , IA No street area — — —
52220 Conroy , IA Standard 199 — $213,000
52236 Homestead , IA Standard 564 $87,958 $191,500
52251 Ladora , IA Standard 544 $87,708 $120,300
52301 Marengo , IA Standard 4,028 $70,150 $160,300
52307 Middle Amana , IA Standard 63 $43,388 —
52308 Millersburg , IA Standard 129 $79,688 $106,500
52316 North English , IA Standard 1,597 $60,768 $150,600
52325 Parnell , IA Standard 477 $75,714 —
52334 South Amana , IA Standard 181 — $172,700
52347 Victor , IA Standard 1,386 $78,482 $144,700
52361 Williamsburg , IA Standard 4,582 $60,992 $211,200

Cite this page

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

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