South Dakota Internet Overview
897 Mbps avg · 375 ZIP codes · 100% fiber · 66 counties
County Grade Distribution
Best Broadband Counties in South Dakota
| County | Grade | Avg Download | Fiber | ZIPs |
|---|---|---|---|---|
| Roberts | A | 1000 Mbps | 100% | 8 |
| Deuel | A | 1000 Mbps | 100% | 7 |
| Grant | A | 1000 Mbps | 100% | 10 |
| Clark | A | 1000 Mbps | 100% | 6 |
| Day | A | 1000 Mbps | 100% | 7 |
| Hamlin | A | 1000 Mbps | 100% | 5 |
| Marshall | A | 1000 Mbps | 100% | 6 |
| Davison | A | 1000 Mbps | 100% | 3 |
| Hanson | A | 1000 Mbps | 100% | 3 |
| Sanborn | A | 1000 Mbps | 100% | 3 |
| Miner | A | 1000 Mbps | 100% | 4 |
| Brule | A | 1000 Mbps | 100% | 3 |
| Buffalo | A | 1000 Mbps | 100% | 2 |
| Hyde | A | 1000 Mbps | 100% | 3 |
| Jerauld | A | 1000 Mbps | 100% | 2 |
Slowest Counties in South Dakota
| County | Grade | Avg Download | Fiber | ZIPs |
|---|---|---|---|---|
| Todd | D | 100 Mbps | 100% | 5 |
| Clay | C | 1000 Mbps | 100% | 3 |
| Jackson | B | 100 Mbps | 100% | 4 |
| Mellette | B | 100 Mbps | 100% | 4 |
| Oglala Lakota | B | 100 Mbps | 100% | 8 |
| Jones | B | 100 Mbps | 100% | 3 |
| Douglas | B | 1000 Mbps | 100% | 5 |
| Custer | B | 1000 Mbps | 100% | 4 |
| Charles Mix | B | 1000 Mbps | 100% | 7 |
| McCook | B | 1000 Mbps | 100% | 6 |
| Bennett | A | 100 Mbps | 100% | 3 |
| Turner | A | 1000 Mbps | 100% | 7 |
| Bon Homme | A | 1000 Mbps | 100% | 5 |
| Meade | A | 1000 Mbps | 100% | 14 |
| Lincoln | A | 1000 Mbps | 100% | 9 |
All 66 Counties in South Dakota
Internet Providers in South Dakota
| Provider | ZIP Codes | Max Speed |
|---|---|---|
| T-Mobile | - | 25 Mbps |
| Lumen (CenturyLink) | - | 940 Mbps |
| Rise Broadband | 375 | 250 Mbps |
| Midcontinent Communications | 375 | 1,000 Mbps |
| Celerity Broadband LLC | 375 | 40 Mbps |
| Golden West Telecommunications | 375 | 100 Mbps |
| Venture Communications Cooperative, INC | 375 | 1,000 Mbps |
| Interstate Telecommunications Cooperative, INC. | 375 | 1,000 Mbps |
Cities in South Dakota
Neighboring States
See how your connection compares to the 897 Mbps average in South Dakota.
Frequently Asked Questions
What is the average internet speed in South Dakota?
South Dakota has an average maximum download speed of 897 Mbps across 375 ZIP codes. 100% of areas have fiber internet access, and the state averages 10 providers per ZIP code.
Which counties in South Dakota have the best internet?
The counties with the best broadband in South Dakota include Roberts (Grade A), Deuel (Grade A), Grant (Grade A). These areas have the fastest average speeds and most provider competition.
How does South Dakota compare to the national average?
The national average download speed is 876 Mbps, while South Dakota averages 897 Mbps, above the national average. Nationally, 96% of areas have fiber, compared to 100% in South Dakota.
For this entity, the underlying data on this page comes from the FCC Broadband Data Collection (BDC). The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
The methodology behind every numeric value on this page is publicly documented on the the FCC Broadband Data Collection (BDC) portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. ZIPs, counties, and states with similar size, similar exposure, or similar geography — not the national-level summary alone.
Source: FCC Broadband Data Collection, 2026.