Castlewood SD ZIP Code
Castlewood city is located in South Dakota State, Hamlin County and has a unique zip code assigned by the US Postal Service Office.
You can search for the Castlewood SD zip code by its streets and block numbers if we have some of the Castlewood streets loaded in our website
Castlewood Area Code is 605 and Time Zone is Central (GMT -06:00).
Castlewood Zip Code - South Dakota
The US ZIP Code basic format consists of five decimal numerical digits assigned to the Castlewood City. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the Castlewood ZIP code, a hyphen, and four more digits that determine a more specific location within a given ZIP code in Castlewood, South Dakota.
The Castlewood Zip Code is 57223.
If you want to send a mail to Castlewood City, you should use the 57223 Zip Code.
In 1983, the U.S. Postal Service introduced an expanded Castlewood 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 57223 Zip code plus four additional digits to identify a geographic segment within the five-digit delivery area, such as a Castlewood 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.