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Zip Code 99328 — Dayton, WA

99328 is a ZIP Code associated with Dayton, WA, located within Columbia. The postal region supports an estimated population of 3,646 residents across Data Pending housing units, with a population density of 2.1 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (46.269370, -117.879560)

Data MetricLocal Statistic
Postal / Zip Code99328
Primary CityDayton
State / ProvinceWA
CountyColumbia
Total Population3,646
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density2.1 people/sq mi
TimezoneAmerica/Los_Angeles

How 99328 Compares

MetricZIP 99328Columbia CountyWA State Average
Population3,6463,7407,816,021
Median IncomeData PendingN/AN/A
Population Density2.1 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 99361Waitsburg12.8 mi1,992N/A
Zip 99329Dixie15.6 mi127N/A
Zip 99347Pomeroy18.2 mi2,512N/A
Zip 99359Starbuck22.5 mi94N/A
Zip 99362Walla Walla24.2 mi42,853N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →