Groton SD ZIP Code
Groton city is located in South Dakota State, Brown County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Groton SD zip code by its streets and block numbers if we have some of the Groton streets loaded in our website
Groton Area Code is 605 and Time Zone is Central (GMT -06:00).
Groton Zip Code - South Dakota
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Groton City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Groton ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Groton, South Dakota.
The Groton Zip Code is 57445.
If you want to send a mail to Groton City, you should use the 57445 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Groton 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 57445 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Groton 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.