Rapid City, SD is currently using only one area code which is area code 605. Area code 605 covers the entire state of South Dakota and was established in 1947.
In addition to Rapid City, SD area code 605 serves the larger cities and communities of Aberdeen, Pierre, Rapid City, Sioux Falls, and Watertown in addition to many smaller communities within the service area.
Rapid City, SD is located in Pennington County and observes the Mountain Time Zone. View our Times by Area Code tool.