South Dakota Zip Codes

Zip codes South Dakota - SD, US

The US Postal Code assigns a unique code for each city in the South Dakota State, US.

Since 1980, US adopted an extended zip+4 code system (officially called Zip Code 5 Plus 4 - US Postal Code) that still coexists with the previous one. The new SD zip codes system includes the five digits of the city ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code.

In this web site you can search for South Dakota ZIP Codes using both ZIP Code Standard and Zip Code 5 plus 4 SD