Harsens Island MI ZIP Code
Harsens Island city is located in Michigan State, Saint Clair County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Harsens Island MI zip code by its streets and block numbers if we have some of the Harsens Island streets loaded in our website
Harsens Island Area Code is 810 and Time Zone is Eastern (GMT -05:00).
Harsens Island Zip Code - Michigan
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Harsens Island City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Harsens Island ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Harsens Island, Michigan.
The Harsens Island Zip Code is 48028.
If you want to send a mail to Harsens Island City, you should use the 48028 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Harsens Island 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 48028 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Harsens Island 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 Michigan.