Find the last 4 digits (ZIP+4) for an address in 99328

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ZIP Code 99328 – Dayton, WA

Dayton, Washington · Columbia County · Pacific time

ZIP code99328
CityDayton
StateWashington
CountyColumbia County
Population3,646
Time zonePacific · local time
ZIP typeStandard (has a Census ZCTA area)
Land area657.29 sq mi
Center (lat, long)46.2757, -117.8709

Area codes in this area

509

These are the area codes that most often serve ZIP 99328 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

99361 Waitsburg · 13.3 mi99329 Dixie · 16.2 mi99347 Pomeroy · 17.4 mi99359 Starbuck · 21.5 mi99362 Walla Walla · 24.3 mi99402 Asotin · 25.1 mi99136 Hay · 27.8 mi99348 Prescott · 28.3 mi

About ZIP 99328

ZIP code 99328 is assigned to Dayton, Washington. It lies in Columbia County. Its Census area covers about 657.29 square miles of land. The closest neighboring ZIP is 99361 (Waitsburg), about 13.3 miles away.

Every address in 99328 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources