Interstate Telecommunications Cooperative, INC. Internet in South Dakota
375 ZIP codes covered · 1,000 Mbps max download · Fiber (FTTH)
Interstate Telecommunications Cooperative, INC. in South Dakota: What You Get
Interstate Telecommunications Cooperative, INC. is one of 10 broadband providers active across South Dakota, with reported coverage in 375 ZIP codes out of 375 statewide. The carrier delivers service over Fiber (FTTH), with an advertised maximum of 1,000 Mbps download and 100 Mbps upload at the top tier where the network supports it. Statewide, South Dakota averages 897 Mbps advertised download and 100% fiber-to-the-home coverage per the latest FCC National Broadband Map.
FCC Broadband Data Collection coverage is filed at the location level by every facilities-based provider and rolled up to ZIP, county, and state aggregates roughly every six months. A Interstate Telecommunications Cooperative, INC. report inside a South Dakota ZIP code means at least one address inside the ZIP qualifies for service; it does not guarantee every home in the ZIP can subscribe at the advertised peak tier. For a definitive address-level check, use the FCC's public lookup or call the carrier directly.
South Dakota ZIP Codes Where Interstate Telecommunications Cooperative, INC. Reports Service
Top 40 South Dakota ZIPs by Broadband Grade where Interstate Telecommunications Cooperative, INC. appears in the FCC BDC filings. The full 375-ZIP footprint is available via the provider's national page.
| ZIP | City / County | Grade | Max Mbps | Providers |
|---|---|---|---|---|
| 56219 | Roberts | A | 1,000 | 10 |
| 57213 | Deuel | A | 1,000 | 10 |
| 57216 | Grant | A | 1,000 | 10 |
| 57217 | Clark | A | 1,000 | 10 |
| 57218 | Deuel | A | 1,000 | 10 |
| 57219 | Day | A | 1,000 | 10 |
| 57221 | Hamlin | A | 1,000 | 10 |
| 57223 | Hamlin | A | 1,000 | 10 |
| 57224 | Roberts | A | 1,000 | 10 |
| 57225 | Clark | A | 1,000 | 10 |
| 57226 | Deuel | A | 1,000 | 10 |
| 57227 | Roberts | A | 1,000 | 10 |
| 57232 | Marshall | A | 1,000 | 10 |
| 57234 | Deuel | A | 1,000 | 10 |
| 57236 | Clark | A | 1,000 | 10 |
| 57237 | Deuel | A | 1,000 | 10 |
| 57238 | Deuel | A | 1,000 | 10 |
| 57239 | Day | A | 1,000 | 10 |
| 57241 | Hamlin | A | 1,000 | 10 |
| 57242 | Hamlin | A | 1,000 | 10 |
| 57246 | Grant | A | 1,000 | 10 |
| 57247 | Marshall | A | 1,000 | 10 |
| 57248 | Hamlin | A | 1,000 | 10 |
| 57251 | Grant | A | 1,000 | 10 |
| 57252 | Grant | A | 1,000 | 10 |
| 57255 | Roberts | A | 1,000 | 10 |
| 57256 | Grant | A | 1,000 | 10 |
| 57257 | Roberts | A | 1,000 | 10 |
| 57258 | Clark | A | 1,000 | 10 |
| 57259 | Grant | A | 1,000 | 10 |
| 57260 | Roberts | A | 1,000 | 10 |
| 57261 | Day | A | 1,000 | 10 |
| 57262 | Roberts | A | 1,000 | 10 |
| 57264 | Grant | A | 1,000 | 10 |
| 57265 | Grant | A | 1,000 | 10 |
| 57266 | Grant | A | 1,000 | 10 |
| 57268 | Deuel | A | 1,000 | 10 |
| 57269 | Grant | A | 1,000 | 10 |
| 57270 | Marshall | A | 1,000 | 10 |
| 57271 | Clark | A | 1,000 | 10 |
See how your connection compares to Interstate Telecommunications Cooperative, INC.'s advertised 1,000 Mbps tier in South Dakota.
Other South Dakota Internet Providers
Interstate Telecommunications Cooperative, INC. South Dakota FAQ
Is Interstate Telecommunications Cooperative, INC. available in South Dakota?
Yes. Interstate Telecommunications Cooperative, INC. reports broadband service in 375 South Dakota ZIP codes in the FCC Broadband Data Collection filings as of April 2026. Coverage is reported at the location level and rolled up to ZIP code, so individual addresses inside a covered ZIP may or may not qualify for the advertised maximum tier.
What speeds does Interstate Telecommunications Cooperative, INC. offer in South Dakota?
Interstate Telecommunications Cooperative, INC. reports a maximum advertised download of 1,000 Mbps and maximum upload of 100 Mbps using Fiber (FTTH) in South Dakota. Real-world median throughput typically runs 60-80% of advertised speeds during peak evening hours per M-Lab measurement data.
Does Interstate Telecommunications Cooperative, INC. offer fiber internet in South Dakota?
Interstate Telecommunications Cooperative, INC. reports fiber-to-the-home availability in 375 ZIP codes nationwide, including portions of its South Dakota footprint. Fiber tiers from Interstate Telecommunications Cooperative, INC. support symmetrical multi-gig speeds where deployed; legacy DSL and cable portions of the footprint use copper plant.
How does Interstate Telecommunications Cooperative, INC. compare to other South Dakota internet providers?
South Dakota has an average of 10 reported broadband providers per ZIP code and an average advertised download of 897 Mbps statewide. T-Mobile and Lumen (CenturyLink) are the next-largest reporting providers in the state. See the full South Dakota state profile for the complete competitive landscape.
How can I check Interstate Telecommunications Cooperative, INC. availability at my South Dakota address?
Look up your ZIP code on this site to see every provider that reports coverage there, including Interstate Telecommunications Cooperative, INC.. The FCC also operates an address-level lookup at broadbandmap.fcc.gov where you can file a challenge if the reported coverage does not match what is actually serviceable at your home.
Source: FCC Broadband Data Collection, 2026.