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zipcodes.pro — STATE/IA/COUNTY/POWESHIEK

Poweshiek County, IA ZIP codes

There are 8 ZIP codes in Poweshiek County, IA, in 8 towns, from 50112 to 52232. The largest are 50112 (Grinnell), 52211 (Brooklyn) and 50171 (Montezuma).

The county seat is Montezuma.

ZIP codes
8
Towns
8
County seat
Montezuma
County FIPS
19157
State
Iowa
Population
18,545
Median household income
$67,391
Land area
585 sq mi
Area code
641

Poweshiek County ZIP codes by town

Montezuma (county seat)
50171

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 Poweshiek County ZIP codes

5011250157501715024252211522215222252232

The ZIP codes of Poweshiek 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.

Poweshiek County in numbers

About 18,545 people live in Poweshiek County, in 7,804 households, the 37th most populous of Iowa's 99 counties. The median household income is $67,391 a year, 10% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $209,300 (about the same as the Iowa median), and median gross rent is $883 a month. The median age is 41.0; 27.3% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 19 minutes.

Population18,545Poweshiek18,545
Households7,804Poweshiek7,804
Median age41.0Poweshiek41.0Iowa38.6US 38.9
Median household income$67,391Poweshiek$67,391Iowa$75,059US $80,734
Median home value$209,300Poweshiek$209,300Iowa$208,000US $332,700
Median gross rent$883Poweshiek$883Iowa$972US $1,413
Bachelor's degree or higher27.3%Poweshiek27.3%Iowa31.4%US 35.7%
Mean commute18.6 minPoweshiek18.6 minIowa19.8 minUS 26.4 min
Population density32 / sq miPoweshiek32 / 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 Poweshiek County

Largest towns in Poweshiek County
TownZIP codesPopulation
Grinnell 1 9,505
Brooklyn 1 1,459
Montezuma 1 1,410
Deep River 1 335
Malcom 1 221
Hartwick 1 114
Searsboro 1 109
Guernsey 1 50

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 Poweshiek County.

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

Every ZIP code in Poweshiek County, with figures

ZIP codes in Poweshiek County
ZIP City Type Population Median income Median home
50112 Grinnell , IA Standard 11,862 $67,078 $214,900
50157 Malcom , IA Standard 473 $115,000 $157,500
50171 Montezuma , IA Standard 2,524 $65,000 $216,000
50242 Searsboro , IA Standard 326 $67,104 $225,000
52211 Brooklyn , IA Standard 2,795 $73,922 $200,300
52221 Guernsey , IA Standard 332 $86,473 $228,000
52222 Deep River , IA Standard 631 $81,964 $120,500
52232 Hartwick , IA Standard 277 $99,391 —

Cite this page

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

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