Kelso WA ZIP Code
Kelso city is located in Washington State, Cowlitz County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Kelso WA zip code by its streets and block numbers if we have some of the Kelso streets loaded in our website
Kelso Area Code is 360 and Time Zone is Pacific (GMT -08:00).
Kelso Zip Code - Washington
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Kelso City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Kelso ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Kelso, Washington.
The Kelso Zip Code is 98626.
If you want to send a mail to Kelso City, you should use the 98626 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Kelso 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 98626 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Kelso 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.