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ZIP Code Database - Facts & Stats

Data Last Updated: March 1, 2023

ZIP Codes for City of Spencer, IA

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Counties:CLAY, IA
Area Code(s):712
Timezone(s):Central (GMT -06:00)
City Population:11,233 (More Details)
CBSA:Spencer, IA
Congressional District(s):04
Land Area:567 square miles (county)
Water Area:5 square miles (county)

1 ZIP Code

Spencer, IA ZIP Code Boundaries

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Spencer, IA Covers 1 ZIP Code

ZIP CodeTypePopulation% of PopulationAliases

Spencer, IA Demographic Information *

Total population**11,233
Male population5,356
Female population5,877
Median age (years)41.5
White Population10,779
Black Population60
Indian Population32
Asian Population78
Hawaiian Population1
Hispanic Population390
Median age (Male)39
Median age (Female)44.2
Total households5,018
Family households (families)3,009
Average household size2.19
Average family size2.8
Total housing units5,431
* Demographic data is based on 2010 Census for the City of SPENCER.
** City and ZIP Code Population will not be equal due to differences in their geographies.


  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],