Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/WA/DAYTON

Dayton ZIP code, Washington

The ZIP code for Dayton, WA is 99328, and its area code is 509.

USPS city name
1 ZIP code
Population
2,774
Area code
509

Dayton in numbers

About 2,774 people live in Dayton, in 1,235 households. The median household income is $70,625 a year, 28% below the Washington median of $98,141 (US: $80,734). The median owner-occupied home is valued at $243,600 (57% below the Washington median), and median gross rent is $973 a month. The median age is 45.3; 24.3% of adults 25 and over hold a bachelor's degree or higher (39.6% across Washington); the average commute takes 22 minutes.

Population2,774Dayton2,774
Households1,235Dayton1,235
Median age45.3Dayton45.3Washington38.3US 38.9
Median household income$70,625Dayton$70,625Washington$98,141US $80,734
Median home value$243,600Dayton$243,600Washington$564,600US $332,700
Median gross rent$973Dayton$973Washington$1,760US $1,413
Bachelor's degree or higher24.3%Dayton24.3%Washington39.6%US 35.7%
Mean commute22.1 minDayton22.1 minWashington26.6 minUS 26.4 min
Population density1,924 / sq miDayton1,924 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Dayton city. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Dayton

ZIP codes with the USPS city name Dayton
ZIP City Type Population Median income Median home
99328 Dayton , WA Standard 3,646 $72,756 $272,100

Map of Dayton ZIP codes

99328

The ZIP codes of Dayton, WA, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Dayton

The nearest larger towns are Walla Walla (33,925 people, 24 mi), College Place (9,854 people, 28 mi) and Milton-Freewater, OR (7,036 people, 33 mi).

Towns near Dayton
TownPopulationDistance
Walla Walla 33,925 24.4 mi
College Place 9,854 27.5 mi

More nearby: every ZIP code in Columbia County · Washington ZIP codes

Cite this page

zipcodes.pro. “Dayton, WA ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/wa/dayton

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