Frankfort SD ZIP Code
Frankfort city is located in South Dakota State, Spink County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Frankfort SD zip code by its streets and block numbers if we have some of the Frankfort streets loaded in our website
Frankfort Area Code is 605 and Time Zone is Central (GMT -06:00).
Frankfort Zip Code - South Dakota
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Frankfort City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Frankfort ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Frankfort, South Dakota.
The Frankfort Zip Code is 57440.
If you want to send a mail to Frankfort City, you should use the 57440 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Frankfort 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 57440 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Frankfort 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.