Onalaska WA ZIP Code
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Onalaska city is located in Washington State, Lewis County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Onalaska WA zip code by its streets and block numbers if we have some of the Onalaska streets loaded in our website
Onalaska Area Code is 360 and Time Zone is Pacific (GMT -08:00).
Onalaska Zip Code - Washington
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Onalaska City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Onalaska ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Onalaska, Washington.
The Onalaska Zip Code is 98570.
If you want to send a mail to Onalaska City, you should use the 98570 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Onalaska ZIP code system that it called ZIP+4, often called "plus-four codes", "add-on codes", or "add ons". A ZIP+4 code uses the basic 98570 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Onalaska city block, a group of apartments, an individual high-volume receiver of mail or any other unit that could use an extra identifier to aid in efficient mail sorting and delivery in Washington.