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ZIP Code Database - Facts & Stats

Data Last Updated: June 1, 2023

ZIP Codes for City of Onalaska, WA

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Counties:LEWIS, WA
Area Code(s):360, 564
Timezone(s):Pacific (GMT -08:00)
City Population:621 (More Details)
CBSA:Centralia, WA
Congressional District(s):03
Land Area:2,403 square miles (county)
Water Area:33 square miles (county)

1 ZIP Code

Onalaska, WA ZIP Code Boundaries

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Onalaska, WA Covers 1 ZIP Code

ZIP CodeTypePopulation% of PopulationAliases
98570Standard3,889100.00%ALPHA, LACAMAS

Onalaska, WA Demographic Information *

Total population**621
Male population300
Female population321
Median age (years)39.7
White Population575
Black Population3
Indian Population20
Asian Population0
Hawaiian Population0
Hispanic Population30
Median age (Male)40.4
Median age (Female)38.8
Total households238
Family households (families)175
Average household size2.61
Average family size2.97
Total housing units251
* Demographic data is based on 2010 Census for the City of ONALASKA.
** 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],