| District of South Dakota area codes: 605 | |
|---|---|
| Country | United States |
| State/Province | South Dakota |
| Major City | Sioux Falls |
| Time Zone | Central (UTC-06:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 605-355 | Pennington | Rapid City, SD | Qwest Corporation |
| 605-356 | Union | Elk Point, SD | Qwest Corporation |
| 605-357 | Minnehaha | Sioux Falls, SD | Qwest Corporation |
| 605-358 | Brown | Frederick, SD | Dickey Rural Telephone Cooperative |
| 605-359 | Minnehaha | Sioux Falls, SD | Cellco Partnership DBA Verizon Wireless |
| 605-360 | Minnehaha | Sioux Falls, SD | New Cingular Wireless PCS - IL |
| 605-361 | Minnehaha | Sioux Falls, SD | Qwest Corporation |
| 605-362 | Minnehaha | Sioux Falls, SD | Qwest Corporation |
| 605-363 | Minnehaha | Humboldt, SD | Sioux Valley Tel DBA Golden West Telecommunication |
| 605-364 | Yankton | Lesterville, SD | Vivian Tel Co DBA Golden West Telecommunications |
| 605-365 | Ziebach | Dupree, SD | Cheyenne River Sioux Tribal Telephone Auth. |
| 605-366 | Minnehaha | Sioux Falls, SD | Cellco Partnership DBA Verizon Wireless |
| 605-367 | Minnehaha | Sioux Falls, SD | Qwest Corporation |
| 605-368 | Lincoln | Tea, SD | Qwest Corporation |
| 605-369 | Bon Homme | Springfield, SD | Vivian Tel Co DBA Golden West Telecommunications |
| 605-370 | Minnehaha | Sioux Falls, SD | New Cingular Wireless PCS - IL |
| 605-371 | Minnehaha | Sioux Falls, SD | Qwest Corporation |
| 605-372 | Lincoln | Lennox, SD | Knology Community Telephone |
| 605-373 | Minnehaha | Sioux Falls, SD | Qwest Corporation |
| 605-374 | Perkins | Lemmon, SD | West River Cooperative Telephone Company |
There are 630 prefixes, In the code area, the major cities are Aberdeen, SD;Pierre, SD;Rapid City, SD;Sioux Falls. The major city is Sioux Falls.