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/ONALASKA

Onalaska ZIP code, Washington

The ZIP code for Onalaska, WA is 98570, and its area code is 360.

USPS city name
1 ZIP code
Overlapping the city
1 more
Population
848
Area code
360

NANPA lists no telephone rate centre for Onalaska itself, so these are the area codes of the nearest one, Salkum (7.5 miles). A town on an area-code boundary can differ from its neighbour.

Mail addressed to Onalaska uses the ZIP code above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

Onalaska in numbers

About 848 people live in Onalaska, in 333 households. The median owner-occupied home is valued at $423,700 (25% below the Washington median), and median gross rent is $844 a month. The median age is 38.4; 19.0% of adults 25 and over hold a bachelor's degree or higher (39.6% across Washington).

Population848Onalaska848
Households333Onalaska333
Median age38.4Onalaska38.4Washington38.3US 38.9
Median home value$423,700Onalaska$423,700Washington$564,600US $332,700
Median gross rent$844Onalaska$844Washington$1,760US $1,413
Bachelor's degree or higher19.0%Onalaska19.0%Washington39.6%US 35.7%
Population density529 / sq miOnalaska529 / sq mi

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

ZIP codes addressed as Onalaska

ZIP codes with the USPS city name Onalaska
ZIP City Type Population Median income Median home
98570 Onalaska , WA Standard 5,319 $95,795 $428,200

Other ZIP codes overlapping Onalaska

These ZIP codes cover part of Onalaska but are addressed as somewhere else.

ZIP codes overlapping Onalaska
ZIP City Type Population Median income Median home
98532 Chehalis , WA Standard 27,135 $89,910 $427,100

Map of Onalaska ZIP codes

98570

The ZIP codes of Onalaska, 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 Onalaska

The nearest larger towns are Napavine (2,158 people, 9.1 mi), Mossyrock (875 people, 11 mi) and Winlock (2,140 people, 12 mi).

Towns near Onalaska
TownPopulationDistance
Chehalis 7,587 13.4 mi
Centralia 18,830 15.8 mi
Grand Mound 3,287 20.9 mi
Rochester 5,834 23.7 mi
Yelm 11,102 25.4 mi
North Yelm 2,522 27.2 mi
Lexington 4,413 28.5 mi
Eatonville 2,850 29.0 mi
Longview Heights 4,357 29.9 mi

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

Cite this page

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

Underlying data is public domain or openly licensed — sources, vintages and licences.