Rapid City, South Dakota

Where Is Area Code 605?

Area code 605 serves the entire state of South Dakota, including Rapid City in the western part of the state. It is the only area code in South Dakota, so it covers both large cities and rural communities across the state. Rapid City is one of the best-known cities in the 605 area, along with Sioux Falls, Aberdeen, Brookings, Mitchell, Pierre, Watertown, and Yankton.

Area code 605 covers counties and communities across western, central, and eastern South Dakota. In the Rapid City area, it serves Pennington County and nearby Black Hills communities such as Spearfish, Sturgis, Deadwood, Custer, and Hot Springs. It also reaches the state capital, Pierre, in Hughes and Stanley counties.

Area code 605 includes some of South Dakota’s most notable landmarks and geographic features. These include the Black Hills, Mount Rushmore National Memorial, Badlands National Park, Wind Cave National Park, and Custer State Park. The area code also covers lands connected to the Missouri River, which runs through central South Dakota.

History of Area Code 605

Area code 605 was established in 1947 as one of the original North American area codes. It has served South Dakota since the North American Numbering Plan began. It was not split from another area code.

Area code 605 has never had an overlay or a geographic split. South Dakota’s low population and slower telephone number growth allowed the state to keep a single area code. As mobile phones, fax lines, and business lines increased, 605 still remained the state’s only area code.

Key Facts About Area Code 605

• Area code 605 is in South Dakota, and Rapid City is one of its major cities.
• Area code 605 serves the entire state of South Dakota, not just one region or metro area.
• Area code 605 is in the Mountain Time Zone in Rapid City and western South Dakota, and in the Central Time Zone in much of eastern South Dakota.
• Area code 605 is an original area code created in 1947 under the North American Numbering Plan.
• Area code 605 has never been split or overlaid by another area code.
• South Dakota had a population of 919,318 in the 2020 United States Census, and area code 605 serves that statewide population.
• Area code 605 covers major South Dakota institutions including South Dakota State University in Brookings and the University of South Dakota in Vermillion.
• Area code 605 includes major landmarks such as Mount Rushmore National Memorial, the Black Hills, Badlands National Park, and the state capital, Pierre.

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 in area code 605 include Rapid City, Sioux Falls, Aberdeen, Brookings, Mitchell, Pierre, Watertown, Yankton, Spearfish, and Sturgis.

Is area code 605 a toll-free number?

No, area code 605 is a geographic area code for South Dakota.