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ZIP Code Database - Facts & Stats

Data Last Updated: February 1, 2023

ZIP Codes for City of Mattawa, WA

Mattawa, WA Covers 1 ZIP Code

ZIP CodeTypeCountyPopulation
ZIP Code 99349StandardGrant8,483

Timezone(s):Pacific (GMT -08:00)
Counties:GRANT, WA
Population:4,437 (More Details)
Male Population:2,473
Female Population:1,964
Median Age:22
ZIP Codes:1
Area Codes:1
Total Area:2,791 square miles (county)
Land Area:2,679 square miles (county)
Water Area:112 square miles (county)

Mattawa, WA Demographic Information *

Total population4,437
Male population2,473
Female population1,964
Median age (years)22
White Population1,995
Black Population38
Indian Population47
Asian Population4
Hawaiian Population0
Hispanic Population4,245
Median age (Male)23.2
Median age (Female)20
Total households791
Family households (families)725
Average household size5.61
Average family size5.28
Total housing units843
* 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],