South Dakota phone numbers and area codes
South Dakota has 1 area code and 745 assigned prefixes.
Look at a prefix's carrier mix below, or look up a full number on the home page.
- Mobile carrier 29%
- Local phone company 35%
- Internet / business phone carrier 11%
- Phone company 25%
Area codes in South Dakota
| Code | Area | Prefixes here |
|---|---|---|
| 605 | South Dakota (all) | 745 |
Biggest local calling areas
Numbers are assigned to rate centers. These have the most prefixes in South Dakota (the number is how many).
Sioux Falls92Rapid City50Aberdeen22Spearfish20Watertown17Pierre15Huron15Yankton14Mitchell13Harisbgtea11Brookings11Vermillion10Nosioux City10Sturgis9Flandreau9Madison8Redfield8Martin8Milbank8Belle Fourche7Lake Preston5Miller5Mobridge5Chamberlain5Sisseton5Canton5Dupree4Elk Point4Platte4Winner4Salem4Ftthompson4Webster4Beresford4Hill City4Arlington4Lake Andes4Highmore4Bigstonecy4Clark3Onida3McIntosh3Bowdle3Novalentin3Iroquois3Mission3Castlewood3Custer3Britton3Pine Ridge3Howard3Brandon3Volga3Lennox3Kimball3Hot Springs3Glenham3Gettysburg3Gregory3De Smet3
Carriers in South Dakota
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| CenturyLink / Lumen | Local phone company | 106 | 14% |
| Verizon Wireless | Mobile carrier | 100 | 13% |
| AT&T Mobility | Mobile carrier | 81 | 11% |
| Midcontinent Communications | Phone company | 34 | 5% |
| Bluepeak | Phone company | 32 | 4% |
| Venture Communications Cooperative | Local phone company | 30 | 4% |
| Interstate Telecom Coop | Phone company | 28 | 4% |
| Golden West Telecomm | Local phone company | 27 | 4% |
| Golden West Telecommunications | Local phone company | 22 | 3% |
| T-Mobile (including Sprint) | Mobile carrier | 21 | 3% |
| Onvoy | Internet / business phone carrier | 21 | 3% |
| Bandwidth | Internet / business phone carrier | 14 | 2% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number. Source: NANPA central office code records, 2026-10-10.