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ZIP Code Database - Facts & Stats

Data Last Updated: February 1, 2023

ZIP Codes for City of Red Oak, IA

Red Oak, IA Covers 2 ZIP Codes

ZIP CodeTypeCountyPopulation
ZIP Code 51566StandardMontgomery7,035
ZIP Code 51591P.O. BoxMontgomery0

Timezone(s):Central (GMT -06:00)
Population:5,742 (More Details)
Male Population:2,732
Female Population:3,010
Median Age:42
ZIP Codes:2
Area Codes:1
Total Area:425 square miles (county)
Land Area:424 square miles (county)
Water Area:1 square miles (county)

Red Oak, IA Demographic Information *

Total population5,742
Male population2,732
Female population3,010
Median age (years)42.2
White Population5,532
Black Population19
Indian Population22
Asian Population13
Hawaiian Population0
Hispanic Population244
Median age (Male)39.8
Median age (Female)44.6
Total households2,481
Family households (families)1,475
Average household size2.26
Average family size2.9
Total housing units2,887
* Demographic data is based on 2010 Census. Products


  1. U.S. Postal Service [Last Updated: 2/1/2023],
  2. Internal Data Creation [Last Updated: 2/1/2023],
  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],