Where is 605 area code? 

605 – South Dakota

What area code is 605

To South Dakota, it attracts all those who want to enjoy the beauties of the countryside and experience many adventures in the outdoors.

But you will also learn the culture and history of America in a unique way. For even the name the Mount Rushmore State refers to one of the most famous memorials at all, namely the granite-carved portrait heads of the four most important US presidents, which can be found in the Black Hills.