In Keystone there are 2 residential DSL providers covering 67.16% of the city. The average home can get speeds up to 53 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 DSL internet providers in Keystone, SD.
To see availability maps for all providers including fiber, cable, DSL, and more in Keystone, SD please click below.
Keystone, SD Availability Maps
DSL 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
Where in Keystone is DSL internet available?
DSL Internet Availability Key
DSL is available in 67.16% of Keystone. Areas in green have DSL internet service, where areas in yellow or red may not. The most widely available provider is Centurylink. Call one of the companies with service in Keystone above to see who has service at your home.
How fast is DSL internet in Keystone?
The map below shows maximum DSL internet speeds by area in Keystone.
DSL Internet Speed Key
The average Keystone home can get up to 53 Mbps on their DSL internet plan. The fastest DSL download speed in the city is 100 Mbps, which 10.60% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 8.51% 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.
DSL internet speeds tend to be faster in the central parts of Keystone, and slower in the southwest areas of the city.
Is DSL the fastest internet I can get in Keystone?
The fastest internet for you may vary based on where in Keystone you live. In general, fiber competes most often with DSL 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.
DSL 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.
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
Keystone DSL 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 DSL internet in Keystone compare to the rest of South Dakota?
DSL internet speeds in Keystone are much faster versus the average speeds in South Dakota: 0.00 Mbps in South Dakota versus 53 Mbps in the city. The state has similar DSL availability compared to the city. Average DSL coverage in South Dakota is 0.00% versus 67.16% in Keystone.
What zip codes have DSL internet?
DSL 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 DSL internet 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 DSL coverage, slower speeds
- Hill City, SD: more DSL coverage, slower speeds
- Johnson Siding, SD: more DSL coverage, faster speeds
- Custer, SD: less DSL coverage, slower speeds
- Rapid City, SD: more DSL coverage, slower speeds
- Fairburn, SD: less DSL coverage, slower speeds
- Silver City, SD: more DSL coverage, faster speeds
- Sanator, SD: less DSL coverage, slower speeds
- Hayward, SD: less DSL coverage, slower speeds
- Rapid Valley, SD: more DSL coverage, slower speeds
Cities with Similar Populations
- Richwoods, MO: more DSL coverage, slower speeds
- Link, TN: more DSL coverage, slower speeds
- Lochsloy, WA: more DSL coverage, slower speeds
- Luce, MI: more DSL coverage, faster speeds
- Lynn, AL: more DSL coverage, faster speeds
- McGill, NV: more DSL coverage, slower speeds
- Middleville, NY: less DSL coverage, slower speeds
- Red Bank, CA: less DSL coverage, faster speeds
- Renner, SD: less DSL coverage, slower speeds
- Ledbetter, TX: less DSL coverage, slower speeds