Where Is Area Code 605?
Area code 605 serves all of South Dakota, including Rapid City in the western part of the state. South Dakota is part of the Great Plains, and 605 is the state’s only geographic area code.
Major communities include Rapid City, Sioux Falls, Aberdeen, Brookings, Watertown, Pierre, Mitchell, Yankton, Spearfish, Sturgis, and Huron. The code covers every South Dakota county, including Pennington County, where Rapid City is located, and Minnehaha and Lincoln counties, which contain Sioux Falls.
The 605 region includes the Black Hills, Mount Rushmore National Memorial, Badlands National Park, Custer State Park, and the Missouri River. These landmarks represent the state’s western mountains, prairies, river valleys, and rugged badlands.
Cities and Communities in the 605 Area Code
- Rapid City, Pennington County
- Sioux Falls, Minnehaha and Lincoln Counties
- Aberdeen, Brown County
- Brookings, Brookings County
- Watertown, Codington County
- Pierre, Hughes County
- Mitchell, Davison County
- Yankton, Yankton County
- Huron, Beadle County
- Spearfish, Lawrence County
- Sturgis, Meade County
- Belle Fourche, Butte County
- Brandon, Minnehaha County
- Chamberlain, Brule County
- Custer, Custer County
- Deadwood, Lawrence County
- Dell Rapids, Minnehaha County
- Flandreau, Moody County
- Fort Pierre, Stanley County
- Harrisburg, Lincoln County
- Hot Springs, Fall River County
- Lead, Lawrence County
- Lemmon, Perkins County
- Madison, Lake County
- Milbank, Grant County
- Mitchell, Davison County
- Mobridge, Walworth County
- North Sioux City, Union County
- Redfield, Spink County
- Sisseton, Roberts County
- Tea, Lincoln County
- Vermillion, Clay County
- Winner, Tripp County
History of Area Code 605
Area code 605 was established in 1947 as one of the original area codes in the North American Numbering Plan. It covered South Dakota from the beginning, so it was not created by splitting an older area code.
South Dakota has not added a second geographic area code or an overlay to 605. The code has continued to cover the state as telephone use and population centers grew in Rapid City, Sioux Falls, and other communities.
Key Facts About Area Code 605
- Area code 605 is the only geographic area code assigned to South Dakota.
- Rapid City in Pennington County is the primary city associated with area code 605.
- Area code 605 covers South Dakota in the Great Plains region of the United States.
- The 2020 U.S. Census counted 886,667 people in South Dakota, which is an approximate population figure for the 605 geographic footprint.
- Area code 605 was one of the original North American Numbering Plan area codes created in 1947.
- Area code 605 is geographic, not toll-free.
- South Dakota Mines is located in Rapid City, and South Dakota State University is located in Brookings.
- Mount Rushmore National Memorial and Badlands National Park are located within the 605 geographic area.
Frequently Asked Questions
What state is area code 605 in?
Area code 605 is in South Dakota.
What major cities use area code 605?
Major cities include Rapid City, Sioux Falls, Aberdeen, Brookings, Watertown, Pierre, Mitchell, Yankton, Huron, Spearfish, and Sturgis.
What time zone is area code 605 in?
Rapid City, the primary city associated with area code 605, observes Mountain Time.
Is area code 605 a toll-free number?
No, area code 605 is a geographic area code assigned to South Dakota, not a toll-free code.