Port Isabel TX ZIP Code
Port Isabel city is located in Texas State, Cameron County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Port Isabel TX zip code by its streets and block numbers if we have some of the Port Isabel streets loaded in our website
Port Isabel Area Code is 956 and Time Zone is Central (GMT -06:00).
Port Isabel Zip Code - Texas
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Port Isabel City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Port Isabel ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Port Isabel, Texas.
The Port Isabel Zip Code is 78578.
If you want to send a mail to Port Isabel City, you should use the 78578 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Port Isabel 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 78578 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Port Isabel 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 Texas.