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ZIP Code Database - Facts & Stats

Data Last Updated: May 1, 2022

ZIP Codes for City of Johnston, IA

Johnston, IA Covers 1 ZIP Code

ZIP CodeTypeCountyPopulationArea Code(s)
ZIP Code 50131StandardPolk17,499515

Timezone(s):Central (GMT -06:00)
Counties:POLK, IA
Population:17,278 (More Details)
Male Population:8,458
Female Population:8,820
Median Age:37
ZIP Codes:1
Area Codes:1
Total Area:592 square miles (county)
Land Area:574 square miles (county)
Water Area:18 square miles (county)

Johnston, IA Demographic Information *

Total population17,278
Male population8,458
Female population8,820
Median age (years)36.9
White Population15,727
Black Population376
Indian Population13
Asian Population800
Hawaiian Population3
Hispanic Population350
Median age (Male)35.4
Median age (Female)38.1
Total households6,369
Family households (families)4,720
Average household size2.67
Average family size3.14
Total housing units6,618
* Demographic data is based on 2010 Census.

Johnston, IA Other Information

  • Located in POLK County, Iowa
  • Johnston, IA is also known as:

86 Cities within 30 miles of Johnston, IA Products


  1. U.S. Postal Service [Last Updated: 5/1/2022],
  2. Internal Data Creation [Last Updated: 5/1/2022],
  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],