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ZIP Code Database - Facts & Stats

Data Last Updated: January 1, 2023

ZIP Codes for City of Knoxville, IA

Knoxville, IA Covers 1 ZIP Code

ZIP CodeTypeCountyPopulation
ZIP Code 50138StandardMarion11,720

Timezone(s):Central (GMT -06:00)
Counties:MARION, IA
Population:7,313 (More Details)
Male Population:3,529
Female Population:3,784
Median Age:41
ZIP Codes:1
Area Codes:1
Total Area:571 square miles (county)
Land Area:555 square miles (county)
Water Area:16 square miles (county)

Knoxville, IA Demographic Information *

Total population7,313
Male population3,529
Female population3,784
Median age (years)41
White Population7,083
Black Population80
Indian Population20
Asian Population35
Hawaiian Population2
Hispanic Population138
Median age (Male)39.8
Median age (Female)42.1
Total households3,169
Family households (families)1,925
Average household size2.25
Average family size2.9
Total housing units3,527
* Demographic data is based on 2010 Census. Products


  1. U.S. Postal Service [Last Updated: 1/1/2023],
  2. Internal Data Creation [Last Updated: 1/1/2023],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],