In Keystone there are 8 residential internet providers covering 98.00% of the city. The average home can get speeds up to 786 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.
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8 Internet Service Providers in Keystone
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 Keystone are not shown.
Keystone 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
Availability maps for all providers in Keystone
Using the dropdown below, please select a provider. Green indicates nearly all homes have service, red indicates few homes have service, and blank indicates no service.
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Internet service is available in 98.00% of Keystone. Using our interactive availability map, you can compare service areas for different providers, we include fiber, cable, DSL, or fixed wireless internet service for all providers who offer it. You will notice that some providers might be listed multiple times for each service. If you find no providers cover the location you're looking at, you can opt for satellite service. The most widely available provider is Mt. Rushmore Telephone Company. Now you can call companies in Keystone with more confidence that they might be available.
How fast are internet speeds in Keystone?
The map below shows maximum internet speeds by area in Keystone.
Internet Speed Key
The average Keystone home can get up to 786 Mbps on their internet plan. For most people, the fastest download speed in the city is 1,000 Mbps, which 72.72% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, less than 1% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in Keystone.
Internet speeds tend to be faster in the northeast parts of Keystone, and slower in the southwest areas of the city.
What type of internet should I choose in Keystone?
The fastest internet for you may vary based on where in Keystone you live. If speed is your main concern, fiber will be the fastest internet in the city.
- Fiber is the fastest internet type for 72.72% of Keystone homes.
- Cable is fastest for less than 1% of the city.
- DSL is fastest for 9.56%.
- Fixed wireless is fastest for 15.73%.
- Satellite internet may be the only option for 2.00% of Keystone homes.
Internet Market Health in Keystone
Internet Competition Key
The map shows how competitive the Keystone internet service market is. Areas in green have more alternatives, areas in yellow have a few choices, and areas in red may have only one provider. More competition usually means faster speeds and better prices for you, the customer.
Below are quick facts on internet competition and market health in Keystone based on what connections the average home has availabile:
- Average number of internet service providers to a home: 3.6 (unhealthy)
- Average types of service (fiber, cable, DSL, etc): 2.2 (unhealthy)
- Average providers with broadband (25 Mbps+) speeds: 3.5 (unhealthy)
Overall, competition is unhealthy.
Keystone internet customers have the ability to buy internet service from 1 to 6 different providers, depending on where they live. For different types of service, Keystone homes have between 1 and 3 options. The type(s) of service available are fixed wireless, fiber, and dsl, though these may vary depending on the region within the city.
When it comes to broadband download speeds faster than 25 Mbps, the situation is worse. Keystone internet customers who want faster speeds have between 0 and 6 choices of companies offering speeds up to or over 25 Mbps.
More internet companies with faster speeds means fewer monopolies and better prices for customers. In promoting a free market for internet, Keystone needs improvement.
TV & Internet Providers in Depth
Below you'll find which TV and internet providers offer service in Keystone, along with details on where in Keystone and at what speeds.
Mt. Rushmore Telephone Company Fiber in Keystone, SD
Mt. Rushmore Telephone Company fiber coverage
About 72.72%, or 837 people, have Mt. Rushmore Telephone Company fiber internet available to them in the city. The company covers the northeast, southeast, central, east, northwest, south, north, and west Keystone area. Mt. Rushmore Telephone Company is a small internet service provider internet service providers in the US, with internet service available in much of Keystone.
Mt. Rushmore Telephone Company fiber download speeds
Mt. Rushmore Telephone Company is the fastest when comparing download speeds to all other internet providers in Keystone. Versus other fiber providers in the area, Mt. Rushmore Telephone Company fiber is the fastest. There are no different maximum speeds throughout Keystone. The fastest plan anyone in Keystone can order from Mt. Rushmore Telephone Company goes up to 1,000 Mbps, and all Keystone customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Mt. Rushmore Telephone Company fiber upload speeds
In Keystone download speeds tend to be equal to than upload speeds for Mt. Rushmore Telephone Company fiber. Compared to other ISPs, Mt. Rushmore Telephone Company is the fastest where upload speeds are concerned, and the fastest compared to other Keystone fiber providers. Mt. Rushmore Telephone Company offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Keystone is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Centurylink DSL in Keystone, SD
Centurylink DSL coverage
About 35.53%, or 409 people, have Centurylink DSL internet available to them in the city. The company covers the northeast, northwest, and north Keystone area. Centurylink is one of the largest internet service providers internet service providers in the US, with internet service available in some of Keystone.
Centurylink DSL download speeds
Centurylink is below average when comparing download speeds to all other internet providers in Keystone. Versus other DSL providers in the area, Centurylink DSL is the slowest. There are 3 different maximum speeds throughout Keystone. The fastest plan anyone in Keystone can order from Centurylink goes up to 60 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for Keystone customers is up to 51 Mbps.
Show all download speeds
- 77.0% up to 60.0 Mbps
- 9.0% up to 40.0 Mbps
- 13.9% up to 10.0 Mbps
Centurylink DSL upload speeds
In Keystone download speeds tend to be faster than than upload speeds for Centurylink DSL. Compared to other ISPs, Centurylink is the slowest where upload speeds are concerned, and the slowest compared to other Keystone DSL providers. Centurylink offers 3 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Keystone is up to 5.0 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, Centurylink customers can get speeds up to 4.3 Mbps.
Show all upload speeds
- 77.0% up to 5.0 Mbps
- 9.0% up to 3.0 Mbps
- 13.9% up to 1.0 Mbps
Mt. Rushmore Telephone Company DSL in Keystone, SD
Mt. Rushmore Telephone Company DSL coverage
About 33.97%, or 391 people, have Mt. Rushmore Telephone Company DSL internet available to them in the city. The company covers the central, north, southeast, northwest, east, south, and southwest Keystone area. Mt. Rushmore Telephone Company is a small internet service provider internet service providers in the US, with internet service available in a small portion of Keystone.
Mt. Rushmore Telephone Company DSL download speeds
Mt. Rushmore Telephone Company is below average when comparing download speeds to all other internet providers in Keystone. Versus other DSL providers in the area, Mt. Rushmore Telephone Company DSL is the fastest. There are 4 different maximum speeds throughout Keystone. The fastest plan anyone in Keystone can order from Mt. Rushmore Telephone Company goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for Keystone customers is up to 51 Mbps.
Show all download speeds
- 31.2% up to 100.0 Mbps
- 22.8% up to 50.0 Mbps
- 28.6% up to 25.0 Mbps
- 17.4% up to 10.0 Mbps
Mt. Rushmore Telephone Company DSL upload speeds
In Keystone download speeds tend to be faster than than upload speeds for Mt. Rushmore Telephone Company DSL. Compared to other ISPs, Mt. Rushmore Telephone Company is below average where upload speeds are concerned, and the fastest compared to other Keystone DSL providers. Mt. Rushmore Telephone Company offers 4 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Keystone is up to 20 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, Mt. Rushmore Telephone Company customers can get speeds up to 8.4 Mbps.
Show all upload speeds
- 31.2% up to 20.0 Mbps
- 22.8% up to 5.0 Mbps
- 28.6% up to 3.0 Mbps
- 17.4% up to 1.0 Mbps
T-Mobile Home Internet Fixed Wireless in Keystone, SD
T-Mobile Home Internet fixed wireless coverage
About 71.68%, or 825 people, have T-Mobile Home Internet fixed wireless internet available to them in the city. The company covers the northeast, central, northwest, east, north, southeast, west, and south Keystone area. T-Mobile Home Internet is one of the largest internet service providers internet service providers in the US, with internet service available in much of Keystone.
T-Mobile Home Internet fixed wireless download speeds
T-Mobile Home Internet is the slowest when comparing download speeds to all other internet providers in Keystone. Versus other fixed wireless providers in the area, T-Mobile Home Internet fixed wireless is the slowest. There are 2 different maximum speeds throughout Keystone. The fastest plan anyone in Keystone can order from T-Mobile Home Internet goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the city-wide average maximum speed for Keystone customers is up to 42 Mbps.
Show all download speeds
- 22.2% up to 100.0 Mbps
- 77.8% up to 25.0 Mbps
T-Mobile Home Internet fixed wireless upload speeds
In Keystone download speeds tend to be faster than than upload speeds for T-Mobile Home Internet fixed wireless. Compared to other ISPs, T-Mobile Home Internet is below average where upload speeds are concerned, and the slowest compared to other Keystone fixed wireless providers. T-Mobile Home Internet offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Keystone is up to 20 Mbps. Some customers have slower plan choices, which only go up to 3.0 Mbps. On average, T-Mobile Home Internet customers can get speeds up to 6.8 Mbps.
Show all upload speeds
- 22.2% up to 20.0 Mbps
- 77.8% up to 3.0 Mbps
EarthLink Fixed Wireless in Keystone, SD
EarthLink fixed wireless coverage
About 54.91%, or 632 people, have EarthLink fixed wireless internet available to them in the city. The company covers the northeast, central, north, northwest, east, southeast, and west Keystone area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in a majority of Keystone.
EarthLink fixed wireless download speeds
EarthLink is below average when comparing download speeds to all other internet providers in Keystone. Versus other fixed wireless providers in the area, EarthLink fixed wireless is below average. There are 2 different maximum speeds throughout Keystone. The fastest plan anyone in Keystone can order from EarthLink goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the city-wide average maximum speed for Keystone customers is up to 43 Mbps.
Show all download speeds
- 23.9% up to 100.0 Mbps
- 76.1% up to 25.0 Mbps
EarthLink fixed wireless upload speeds
In Keystone download speeds tend to be faster than than upload speeds for EarthLink fixed wireless. Compared to other ISPs, EarthLink is below average where upload speeds are concerned, and below average compared to other Keystone fixed wireless providers. EarthLink offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Keystone is up to 20 Mbps. Some customers have slower plan choices, which only go up to 3.0 Mbps. On average, EarthLink customers can get speeds up to 7.1 Mbps.
Show all upload speeds
- 23.9% up to 20.0 Mbps
- 76.1% up to 3.0 Mbps
AT&T Fixed Wireless in Keystone, SD
AT&T fixed wireless coverage
About 54.91%, or 632 people, have AT&T fixed wireless internet available to them in the city. The company covers the northeast, central, north, northwest, east, southeast, and west Keystone area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in a majority of Keystone.
AT&T fixed wireless download speeds
AT&T is below average when comparing download speeds to all other internet providers in Keystone. Versus other fixed wireless providers in the area, AT&T fixed wireless is below average. There are 2 different maximum speeds throughout Keystone. The fastest plan anyone in Keystone can order from AT&T goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the city-wide average maximum speed for Keystone customers is up to 43 Mbps.
Show all download speeds
- 23.9% up to 100.0 Mbps
- 76.1% up to 25.0 Mbps
AT&T fixed wireless upload speeds
In Keystone download speeds tend to be faster than than upload speeds for AT&T fixed wireless. Compared to other ISPs, AT&T is below average where upload speeds are concerned, and below average compared to other Keystone fixed wireless providers. AT&T offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in Keystone is up to 20 Mbps. Some customers have slower plan choices, which only go up to 3.0 Mbps. On average, AT&T customers can get speeds up to 7.1 Mbps.
Show all upload speeds
- 23.9% up to 20.0 Mbps
- 76.1% up to 3.0 Mbps
Verizon Fixed Wireless in Keystone, SD
Verizon fixed wireless coverage
About 27.37%, or 315 people, have Verizon fixed wireless internet available to them in the city. The company covers the central, northwest, north, and south Keystone area. Verizon is one of the largest internet service providers internet service providers in the US, with internet service available in a small portion of Keystone.
Verizon fixed wireless download speeds
Verizon is above average when comparing download speeds to all other internet providers in Keystone. Versus other fixed wireless providers in the area, Verizon fixed wireless is the fastest. There are no different maximum speeds throughout Keystone. The fastest plan anyone in Keystone can order from Verizon goes up to 300 Mbps, and all Keystone customers can get this speed.
Show all download speeds
- 100.0% up to 300.0 Mbps
Verizon fixed wireless upload speeds
In Keystone download speeds tend to be faster than than upload speeds for Verizon fixed wireless. Compared to other ISPs, Verizon is below average where upload speeds are concerned, and the fastest compared to other Keystone fixed wireless providers. Verizon offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Keystone is up to 20 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 20.0 Mbps
Keystone Internet by Area
This information is most helpful to those looking for homes or considering moving to Keystone or any of the areas nearby.
How does internet in Keystone compare to the rest of South Dakota?
Internet speeds in Keystone are slower versus the average speeds in South Dakota: 1,953 Mbps in South Dakota versus 786 Mbps in the city. The state has similar internet availability compared to the city. Average internet coverage in South Dakota is 98.12% versus 98.00% in Keystone.
What zip codes have widespread internet?
Internet coverage varies by zip code and neighborhood. Some examples in or around Keystone are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does internet service look like in other cities?
Below are cities nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Cities
- Hermosa, SD: less internet coverage, faster speeds
- Hill City, SD: less internet coverage, slower speeds
- Johnson Siding, SD: more internet coverage, slower speeds
- Custer, SD: more internet coverage, faster speeds
- Rapid City, SD: more internet coverage, faster speeds
- Fairburn, SD: more internet coverage, slower speeds
- Silver City, SD: more internet coverage, slower speeds
- Sanator, SD: more internet coverage, faster speeds
- Hayward, SD: less internet coverage, faster speeds
- Rapid Valley, SD: more internet coverage, faster speeds
Cities with Similar Populations
- Richwoods, MO: more internet coverage, slower speeds
- Link, TN: more internet coverage, faster speeds
- Lochsloy, WA: more internet coverage, faster speeds
- Luce, MI: more internet coverage, slower speeds
- Lynn, AL: more internet coverage, faster speeds
- McGill, NV: less internet coverage, slower speeds
- Middleville, NY: more internet coverage, faster speeds
- Red Bank, CA: more internet coverage, slower speeds
- Renner, SD: more internet coverage, faster speeds
- Ledbetter, TX: more internet coverage, faster speeds