Alpena SD ZIP Code
Alpena city is located in South Dakota State, Jerauld County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Alpena SD zip code by its streets and block numbers if we have some of the Alpena streets loaded in our website
Alpena Area Code is 605 and Time Zone is Central (GMT -06:00).
Alpena Zip Code - South Dakota
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Alpena City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Alpena ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Alpena, South Dakota.
The Alpena Zip Code is 57312.
If you want to send a mail to Alpena City, you should use the 57312 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Alpena 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 57312 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Alpena 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 South Dakota.