Eureka SD ZIP Code
Eureka city is located in South Dakota State, Mcpherson County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Eureka SD zip code by its streets and block numbers if we have some of the Eureka streets loaded in our website
Eureka Area Code is 605 and Time Zone is Central (GMT -06:00).
Eureka Zip Code - South Dakota
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Eureka City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Eureka ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Eureka, South Dakota.
The Eureka Zip Code is 57437.
If you want to send a mail to Eureka City, you should use the 57437 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Eureka 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 57437 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Eureka 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.