Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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zipcodes.pro — STATE/IA/COUNTY/MARION

Marion County, IA ZIP codes

There are 12 ZIP codes in Marion County, IA, in 11 towns, from 50044 to 50256. The largest are 50219 (Pella), 50138 (Knoxville) and 50225 (Pleasantville).

The county seat is Knoxville.

ZIP codes
12
Towns
11
County seat
Knoxville
County FIPS
19125
State
Iowa
Population
33,642
Median household income
$78,680
Land area
554 sq mi
Area code
641
Metro area
Pella

Marion County ZIP codes by town

Knoxville (county seat)
50138

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 Marion County ZIP codes

500445005750062501165011950138501635021450219502255025250256

The ZIP codes of Marion 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.

Marion County in numbers

About 33,642 people live in Marion County, in 13,316 households, the 21st most populous of Iowa's 99 counties. The median household income is $78,680 a year, 5% above the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $233,000 (12% above the Iowa median), and median gross rent is $884 a month. The median age is 39.9; 32.1% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 21 minutes.

Population33,642Marion33,642
Households13,316Marion13,316
Median age39.9Marion39.9Iowa38.6US 38.9
Median household income$78,680Marion$78,680Iowa$75,059US $80,734
Median home value$233,000Marion$233,000Iowa$208,000US $332,700
Median gross rent$884Marion$884Iowa$972US $1,413
Bachelor's degree or higher32.1%Marion32.1%Iowa31.4%US 35.7%
Mean commute21.0 minMarion21.0 minIowa19.8 minUS 26.4 min
Population density61 / sq miMarion61 / 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 Marion County

Largest towns in Marion County
TownZIP codesPopulation
Pella 1 10,720
Knoxville 1 7,473
Pleasantville 1 1,899
Melcher Dallas 2 1,176
Otley 1 719
Tracy 1 643
Bussey 1 414
Columbia 1 327
Harvey 1 174
Hamilton 1 107
Swan 1 55

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 Marion County.

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

Every ZIP code in Marion County, with figures

ZIP codes in Marion County
ZIP City Type Population Median income Median home
50044 Bussey , IA Standard 901 $75,417 $120,700
50057 Columbia , IA Standard 327 $118,882 $221,300
50062 Melcher Dallas , IA Standard 789 $51,146 $198,100
50116 Hamilton , IA Standard 261 $47,143 $168,200
50119 Harvey , IA Standard 392 $59,750 $154,200
50138 Knoxville , IA Standard 11,117 $74,693 $196,700
50163 Melcher Dallas , IA Standard 689 $73,618 $97,800
50214 Otley , IA Standard 719 — $289,700
50219 Pella , IA Standard 14,416 $86,807 $301,400
50225 Pleasantville , IA Standard 3,364 $69,923 $168,500
50252 Swan , IA Standard 236 $112,292 $278,600
50256 Tracy , IA Standard 643 $83,438 $146,800

Cite this page

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

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