In Dewey County there are 2 residential Fiber providers covering 96.11% of the county. The average home can get speeds up to 258 Mbps. Note that we may have a financial relationship with some of the providers below. This does not influence rankings, and helps us provide high-quality detailed information for free.
This page contains all Fiber internet providers in Dewey County, SD.
To see availability maps for all providers including fiber, cable, DSL, and more in Dewey County, SD please click below.
Dewey County, SD Availability Maps
Fiber Internet Service Providers in Dewey County
Data updated 11/14/2025, based on FCC data from 12/31/2024. This is the most current data available as of .
To avoid wasting your time, providers with less than 1% coverage in Dewey County are not shown.
Dewey County Satellite TV & Internet Providers
DISH Satellite TV
DIRECTV Satellite TV
Not sure whether to choose Dish or DIRECTV? For most people most of the time we recommend DISH. But click here to learn more.
Viasat Satellite Internet
Where in Dewey County is fiber internet available?
Fiber Internet Availability Key
Fiber is available in 96.11% of Dewey County. Areas in green have fiber internet service, where areas in yellow or red may not. The most widely available provider is CRST. Call one of the companies with service in Dewey County above to see who has service at your home.
How fast is fiber internet in Dewey County?
The map below shows maximum fiber internet speeds by area in Dewey County.
Fiber Internet Speed Key
The average Dewey County home can get up to 258 Mbps on their fiber internet plan. The fastest fiber download speed in the county is 1,000 Mbps, which 1.03% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 95.08% of homes can only purchase plans up to 250 Mbps. See the internet provider details below for info about their speed and coverage in Dewey County.
Fiber internet speeds tend to be faster in the northeast parts of Dewey County, and slower in the south areas of the county.
Is fiber the fastest internet I can get in Dewey County?
The fastest internet for you may vary based on where in Dewey County you live. In general, satellite competes most often with fiber in the county.
- Fiber is the fastest internet type for 95.78% of Dewey County homes.
- Cable is fastest for less than 1% of the county.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for less than 1%.
- Satellite internet may be the only option for 3.36% of Dewey County homes.
Fiber Providers in Depth
Below you'll find which TV and internet providers offer service in Dewey County, along with details on where in Dewey County and at what speeds.
Cheyenne River Sioux Tribe Telephone Authority (CRST) Fiber in Dewey County, SD
CRST fiber coverage
About 95.67%, or 5,012 people, have CRST fiber internet available to them in the county. The company covers the entire Dewey County area. CRST is a small internet service provider internet service providers in the US, with internet service available in most of Dewey County.
Cheyenne River Sioux Tribe Telephone Authority (CRST) fiber download speeds
CRST is average when comparing download speeds to all other internet providers in Dewey County. Versus other fiber providers in the area, CRST fiber is the slowest. There are no different maximum speeds throughout Dewey County. The fastest plan anyone in Dewey County can order from CRST goes up to 250 Mbps, and all Dewey County customers can get this speed.
Show all download speeds
- 100.0% up to 250.0 Mbps
Cheyenne River Sioux Tribe Telephone Authority (CRST) fiber upload speeds
In Dewey County download speeds tend to be faster than than upload speeds for CRST fiber. Compared to other ISPs, CRST is below average where upload speeds are concerned, and the slowest compared to other Dewey County fiber providers. CRST offers no different upload speeds across the county. The fastest upload speed available to anyone from this ISP in Dewey County is up to 100 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 100.0 Mbps
WRT Fiber in Dewey County, SD
WRT fiber coverage
About 1.03%, or 54 people, have WRT fiber internet available to them in the county. The company covers the northeast Dewey County area. WRT is an average-sized internet service provider internet service providers in the US, with internet service available in a very small piece of Dewey County.
WRT fiber download speeds
WRT is the fastest when comparing download speeds to all other internet providers in Dewey County. Versus other fiber providers in the area, WRT fiber is the fastest. There are no different maximum speeds throughout Dewey County. The fastest plan anyone in Dewey County can order from WRT goes up to 1,000 Mbps, and all Dewey County customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
WRT fiber upload speeds
In Dewey County download speeds tend to be equal to than upload speeds for WRT fiber. Compared to other ISPs, WRT is the fastest where upload speeds are concerned, and the fastest compared to other Dewey County fiber providers. WRT offers no different upload speeds across the county. The fastest upload speed available to anyone from this ISP in Dewey County is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Dewey County Fiber by Area
This information is most helpful to those looking for homes or considering moving to Dewey County or any of the areas nearby.
How does fiber internet in Dewey County compare to the rest of South Dakota?
Fiber internet speeds in Dewey County are much faster versus the average speeds in South Dakota: 0.00 Mbps in South Dakota versus 258 Mbps in the county. The state has similar fiber availability compared to the county. Average fiber coverage in South Dakota is 0.00% versus 96.11% in Dewey County.
What zip codes have fiber internet?
Fiber internet coverage varies by zip code and neighborhood. Some examples in or around Dewey County are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does fiber internet look like in other counties?
Below are counties nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Counties
- Ziebach County, SD: more fiber coverage, faster speeds
- Walworth County, SD: more fiber coverage, faster speeds
- Sully County, SD: more fiber coverage, faster speeds
- Potter County, SD: more fiber coverage, faster speeds
- Edmunds County, SD: more fiber coverage, faster speeds
- Faulk County, SD: more fiber coverage, faster speeds
- Harding County, SD: more fiber coverage, faster speeds
- Brown County, SD: less fiber coverage, faster speeds
- Spink County, SD: less fiber coverage, faster speeds
- Butte County, SD: less fiber coverage, faster speeds
Counties with Similar Populations
- Pendleton County, KY: more fiber coverage, faster speeds
- Jerauld County, SD: more fiber coverage, faster speeds
- Jewell County, KS: less fiber coverage, faster speeds
- Jim Hogg County, TX: less fiber coverage, faster speeds
- Johnson County, GA: less fiber coverage, faster speeds
- Johnson County, NE: less fiber coverage, faster speeds
- Johnson County, WY: less fiber coverage, faster speeds
- Jones County, NC: less fiber coverage, faster speeds
- Jones County, SD: more fiber coverage, faster speeds
- Pecos County, TX: less fiber coverage, faster speeds