| 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 |
|---|---|---|---|
| 605-987 | Lincoln | Canton, SD | Qwest Corporation |
| 605-988 | Minnehaha | Sioux Falls, SD | Qwest Corporation |
| 605-990 | Davison | Mitchell, SD | Sancom DBA Mitchell Telecom |
| 605-993 | Pennington | Wall, SD | Golden West Tel Coop Inc DBA Golden West Telecomm |
| 605-994 | Brown | Hecla, SD | James Valley Cooperative Telephone Company |
| 605-995 | Davison | Mitchell, SD | Qwest Corporation |
| 605-996 | Davison | Mitchell, SD | Qwest Corporation |
| 605-997 | Moody | Flandreau, SD | Qwest Corporation |
| 605-999 | Davison | Mitchell, SD | Cellco Partnership DBA Verizon Wireless |
| 605-555 | Used in movie | Dupree, SD | Used in movie |
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.