Thornton WA ZIP Code
Thornton city is located in Washington State, Whitman County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Thornton WA zip code by its streets and block numbers if we have some of the Thornton streets loaded in our website
Thornton Area Code is 509 and Time Zone is Pacific (GMT -08:00).
Thornton Zip Code - Washington
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Thornton City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Thornton ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Thornton, Washington.
The Thornton Zip Code is 99176.
If you want to send a mail to Thornton City, you should use the 99176 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Thornton 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 99176 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Thornton 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.