Southwest PA ZIP Code
Southwest city is located in Pennsylvania State, Westmoreland County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Southwest PA zip code by its streets and block numbers if we have some of the Southwest streets loaded in our website
Southwest Area Code is 724 and Time Zone is Eastern (GMT -05:00).
Southwest Zip Code - Pennsylvania
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Southwest City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Southwest ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Southwest, Pennsylvania.
The Southwest Zip Code is 15685.
If you want to send a mail to Southwest City, you should use the 15685 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Southwest 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 15685 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Southwest 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.