Williamstown PA ZIP Code
Williamstown city is located in Pennsylvania State, Dauphin County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Williamstown PA zip code by its streets and block numbers if we have some of the Williamstown streets loaded in our website
Williamstown Area Code is 717 and Time Zone is Eastern (GMT -05:00).
Williamstown Zip Code - Pennsylvania
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Williamstown City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Williamstown ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Williamstown, Pennsylvania.
The Williamstown Zip Code is 17098.
If you want to send a mail to Williamstown City, you should use the 17098 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Williamstown 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 17098 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Williamstown 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 Pennsylvania.