Oak Harbor WA ZIP Code
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Oak Harbor city is located in Washington State, Island County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Oak Harbor WA zip code by its streets and block numbers if we have some of the Oak Harbor streets loaded in our website
Oak Harbor Area Code is 360 and Time Zone is Pacific (GMT -08:00).
Oak Harbor Zip Code - Washington
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Oak Harbor City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Oak Harbor ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Oak Harbor, Washington.
The Oak Harbor Zip Code is 98277, 98278.
If you want to send a mail to Oak Harbor City, you should use the 98277, 98278 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Oak Harbor 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 98277, 98278 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Oak Harbor 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.