Keystone SD ZIP Code

Keystone city is located in South Dakota State, Pennington County and has a unique zip code assigned by the US Postal Service Office.

You can search for the Keystone SD zip code by its streets and block numbers if we have some of the Keystone streets loaded in our website

Keystone Area Code is 605 and Time Zone is Mountain (GMT -07:00).

Keystone Zip Code - South Dakota

The US ZIP Code basic format consists of five decimal numerical digits assigned to the Keystone City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Keystone ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Keystone, South Dakota.

The Keystone Zip Code is 57751.

If you want to send a mail to Keystone City, you should use the 57751 Zip Code.

In 1983, the U.S. Postal Service introduced an expanded Keystone 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 57751 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Keystone 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.

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What is the Keystone Zip Code?

The Keystone Zip Code in South Dakota is 57751.

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Keystone, South Dakota - US Zip Code

Keystone ZIP Code Lookup

57751 Zip Code File:
Zip Code: 57751,
City: Keystone
Keystone Area Code: 605
Keystone, SD - Time Zone: Mountain (GMT -07:00)
County: Pennington
City Alias: Keystone
State: South Dakota
State Abb: SD

South Dakota Zip+4 - Nearby Keystone Cities

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