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  5. Area Code 605

Where Is Area Code 605?

Area code 605 is found in the US state of South Dakota. Servicing the entire state, area code 605 includes the city of Sioux Falls (population: 148855), and all 66 counties of South Dakota.

Parts of this area code are located in the Central time zone, while others are in the Mountain time zone. This means that some cities in area code 605 are on the same time as Chicago, IL, while others are on the same time as Phoenix, AZ.

Area code 605 was brought into effect on January 1, 1947.

Map of South Dakota with area code 605 highlighted
Location of Area Code 605 and surrounding states.

Counties in Area Code 605

  • Aurora,
  • Beadle,
  • Bennett,
  • Bon Homme,
  • Brookings,
  • Brown,
  • Brule,
  • Buffalo,
  • Butte,
  • Charles Mix,
  • Clark,
  • Clay,
  • Codington,
  • Corson,
  • Custer,
  • Davison,
  • Day,
  • Deuel,
  • Dewey,
  • Douglas,
  • Edmunds,
  • Fall River,
  • Faulk,
  • Grant,
  • Gregory,
  • Haakon,
  • Hamlin,
  • Hand,
  • Hanson,
  • Hughes,
  • Hutchinson,
  • Hyde,
  • Jackson,
  • Jerauld,
  • Kingsbury,
  • Lake,
  • Lawrence,
  • Lincoln,
  • Lyman,
  • Marshall,
  • McCook,
  • McPherson,
  • Meade,
  • Mellette,
  • Miner,
  • Minnehaha,
  • Moody,
  • Pennington,
  • Perkins,
  • Potter,
  • Roberts,
  • Sanborn,
  • Shannon,
  • Spink,
  • Stanley,
  • Sully,
  • Todd,
  • Tripp,
  • Turner,
  • Union,
  • Walworth,
  • Yankton,
  • Ziebach.

Most Populous Cities in Area Code 605

City County City Population Time Zone
Sioux Falls Minnehaha 148,855 CST
Rapid City Pennington 93,684 MST
Aberdeen Brown 30,719 CST
Watertown Codington 25,330 CST
Brookings Brookings 25,035 CST
Yankton Yankton 19,260 CST
Mitchell Davison 18,624 CST
Sioux Falls Lincoln 18,597 CST
Pierre Hughes 16,721 CST
Spearfish Lawrence 15,135 MST
Huron Beadle 14,830 CST
Vermillion Clay 12,218 CST
Brandon Minnehaha 10,817 CST
Sturgis Meade 9,594 MST
Madison Lake 8,844 CST
Belle Fourche Butte 8,101 MST
Black Hawk Meade 6,460 MST
Box Elder Pennington 6,418 MST
Harrisburg Lincoln 6,362 CST
North Sioux City Union 5,972 CST
Hot Springs Fall River 5,783 MST
Tea Lincoln 5,461 CST
Pine Ridge Shannon 5,454 MST
Custer Custer 5,397 MST
Dell Rapids Minnehaha 5,143 CST

Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.

View all United States Area Codes.

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This page was last updated on July 3, 2015.