Best Internet Providers in Keystone, SD
All 7 providers, ranked by coverage, speed and customer ratings
Find internet availability by address in Keystone, SD
Keystone has 7 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, DSL, and Fixed Wireless internet are available in the city. Reviews are grouped by provider and the type of service they offer, covering all 3 available internet technologies in Keystone.
Ranks compare Keystone with the 15,682 US towns of 1,000 to 9,999 people, the tiers of our fastest-cities rankings.
The Best Internet in Keystone, SD at a Glance
Keystone Internet Providers, Ranked by Coverage, Speed and Customer Ratings
Mt. Rushmore Telephone Company
Connection
Customer Rating
Fiber
DSL
CenturyLink
Connection
Customer Rating
DSL
EarthLink
Connection
Customer Rating
Fixed Wireless
T-Mobile Home Internet
Connection
Customer Rating
Fixed Wireless
Providers with less than 1% coverage in this city are excluded from the list. To see if one of these providers is available at your home, please use the address search above.
Speed and technology may vary by address for all providers. Please note we may have a financial relationship with some of the providers above, which does not impact the customer ratings displayed. Customer ratings listed above are national ratings, local Keystone ratings may vary and are shown below.
Who is the Best Internet Provider in Keystone, SD?
AT&T is the highest-rated internet provider in Keystone based on 7 South Dakota customer reviews, and T-Mobile Home Internet has the highest rating nationwide. The provider information above and the information immediately below can help you decide. Compare provider ratings and review counts above.
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Which Providers are Available at my Home in Keystone?
Coverage changes block by block. Pick a provider and a technology to see where its service reaches: the darker the area, the larger the share of homes it covers. For your exact address, use the address search above.
Coverage map for each provider in Keystone
- Mt. Rushmore Telephone Company - fiber coverage map
- Golden West Telecommunications - fiber coverage map
- Verizon - fixed wireless coverage map
- T-Mobile Home Internet - fixed wireless coverage map
- CenturyLink - dsl coverage map
- Mt. Rushmore Telephone Company - dsl coverage map
- AT&T - fixed wireless coverage map
- EarthLink - fixed wireless coverage map
How Keystone Compares to Places Its Size
Keystone's report card score is in the bottom 27% and its connectivity index is in the bottom 38%.
| Measure | Keystone | Rank among US towns of 1,000 to 9,999 people | Pennington County | South Dakota | US | Leader |
|---|---|---|---|---|---|---|
| ISP Report Card inputs: what providers offer here | ||||||
| Fiber availability | 85.8% | top 41% | 73.0% | 79.0% | 71.5% | 1,056 places at 100.0% |
| Average top speed | 903 Mbps | bottom 15% | 3,782 Mbps | 2,675 Mbps | 3,486 Mbps | Collegedale, TN and Lakesite, TN and 2 more (25,000 Mbps) |
| Providers at a typical address | 3.9 | bottom 19% | 7.4 | 5.8 | 7.1 | McLendon-Chisholm, TX (14.2) |
| Connectivity index inputs: how much households need and use the internet | ||||||
| People per household | 2.5 | top 45% | 2.4 | 2.5 | 2.7 | St. George, GA (6.2) |
| Workers who work from home | 11% | top 39% | 10% | 10% | 15% | Indian Springs, NV (76%) |
| Homes with a computer, tablet or phone | 93% | bottom 44% | 96% | 94% | 96% | 515 places at 100% |
| Homes with internet | 88% | bottom 50% | 91% | 90% | 91% | 115 places at 100% |
| Homes on fiber, cable or DSL | 57% | bottom 29% | 78% | 76% | 76% | Bunkerville, NV and Fort Myer, VA and 3 more (100%) |
| More about the households here | ||||||
| Homes with a desktop or laptop | 78% | top 40% | 81% | 78% | 81% | 12 places at 100% |
| Median household income | $98,791 | top 20% | $77,720 | $80,420 | $93,246 | 16 places at $250,001 |
| Residents in school (6th grade to college) | 10% | bottom 25% | 14% | 15% | 16% | University Park, PA (95%) |
Fiber reaches 85.8% of homes in Keystone, against 73.0% across Pennington County and 79.0% across South Dakota. Households in Keystone are smaller than the US average (2.5 people against 2.7); 11% of workers work from home (US 15%); and the median household income is $98,791 (US $93,246).
Our demographic data is sourced from the latest 5-year release of the American Community Survey by the US Census Bureau.
Fiber, 5G, Cable and DSL Internet in Keystone
Which Fiber Internet Providers are Available in Keystone?
Mt. Rushmore Telephone Company Fiber in Keystone, SD
Availability:
77.2%
Customer Rating:
(0)
Avg. Download Speed
1,000 Mbps
Mt. Rushmore Telephone Company offers Fiber service to 77.2% of Keystone homes. Across the city, Mt. Rushmore Telephone Company Fiber has speeds up to 1,000 Mbps
Golden West Telecommunications Fiber in Keystone, SD
Availability:
11.3%
Customer Rating:
(0)
Avg. Download Speed
1,000 Mbps
Golden West Telecommunications offers Fiber service to 11.3% of Keystone homes. Across the city, Golden West Telecommunications Fiber is the only type of service available from the company, with speeds up to 1,000 Mbps
Which Fixed Wireless and LTE Internet Providers are Available in Keystone?
T-Mobile Home Internet Fixed Wireless in Keystone, SD
Availability:
72.5%
Customer Rating:
(342)
Avg. Download Speed
61 Mbps
T-Mobile Home Internet offers Fixed Wireless service to 72.5% of Keystone homes. Across the city, T-Mobile Home Internet Fixed Wireless is the only type of service available from the company, with speeds up to 61 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 11 Mbps throughout the city.
Verizon Fixed Wireless in Keystone, SD
Availability:
57.0%
Customer Rating:
(362)
Avg. Download Speed
186 Mbps
Verizon offers Fixed Wireless service to 57.0% of Keystone homes. Across the city, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 186 Mbps, with speeds from 25 Mpbs up to 300 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 6.0 and as high as 20, with an average of 14 Mbps throughout the city.
EarthLink Fixed Wireless in Keystone, SD
Availability:
45.5%
Customer Rating:
(4)
Avg. Download Speed
34 Mbps
EarthLink offers Fixed Wireless service to 45.5% of Keystone homes. Across the city, EarthLink Fixed Wireless is the only type of service available from the company, with speeds up to 34 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 5.0 Mbps throughout the city.
AT&T Fixed Wireless in Keystone, SD
Availability:
45.5%
Customer Rating:
(205)
Avg. Download Speed
34 Mbps
AT&T offers Fixed Wireless service to 45.5% of Keystone homes. Across the city, AT&T Fixed Wireless is the only type of service available from the company, with speeds up to 34 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 5.0 Mbps throughout the city.
Which Cable Internet Providers are Available in Keystone?
According to the most recently submitted data by internet service providers to the FCC, there are currently no cable providers available in Keystone, SD.
Which DSL Internet Providers are Available in Keystone?
CenturyLink DSL in Keystone, SD
Availability:
35.5%
Customer Rating:
(120)
Avg. Download Speed
51 Mbps
CenturyLink offers DSL service to 35.5% of Keystone homes. Across the city, CenturyLink DSL is the only type of service available from the company, with speeds up to 51 Mbps, with speeds from 10 Mpbs up to 60 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 5.0, with an average of 4.3 Mbps throughout the city.
Mt. Rushmore Telephone Company DSL in Keystone, SD
Availability:
34.0%
Customer Rating:
(0)
Avg. Download Speed
51 Mbps
Mt. Rushmore Telephone Company offers DSL service to 34.0% of Keystone homes. Across the city, Mt. Rushmore Telephone Company DSL has speeds up to 51 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 8.4 Mbps throughout the city.
Internet in Keystone by Neighborhood and ZIP Code
Keystone has 1 ZIP code with its own page. Each row links to that place’s page.
Neighborhoods in Keystone
| Neighborhood | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|
ZIP codes in Keystone
| ZIP code | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| 57751 | 823 | 82.4% | 875 Mbps | 3.7 | C- | 47/100 |
How Keystone Compares to Nearby Places
The 10 places nearest to Keystone that have their own pages are all within 18 miles. Among them, Sanator has the most homes with fiber (99.9%) and Hill City the fewest (27.5%); Keystone has 85.8%.
| Place | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| Keystone (this page) | 1,151 | 85.8% | 903 Mbps | 3.9 | C- | 41/100 |
| Rapid City | 83,404 | 72.5% | 3,941 Mbps | 7.9 | B+ | 61/100 |
| Rapid Valley | 9,752 | 71.2% | 4,052 Mbps | 7.3 | B | 66/100 |
| Custer | 3,542 | 98.6% | 989 Mbps | 3.8 | C+ | 56/100 |
| Hermosa | 2,024 | 97.2% | 2,833 Mbps | 4.1 | B- | 29/100 |
| Hill City | 2,014 | 27.5% | 447 Mbps | 4.5 | D+ | 40/100 |
| Sanator | 1,391 | 99.9% | 1,000 Mbps | 3.2 | C+ | 51/100 |
| Johnson Siding | 800 | 18.0% | 983 Mbps | 5 | D+ | 62/100 |
| Fairburn | 338 | 100.0% | 1,000 Mbps | 2.9 | C+ | 22/100 |
| Silver City | 202 | 0.0% | 93 Mbps | 1.9 | F | 58/100 |
| Hayward | 84 | 84.5% | 1,958 Mbps | 1.9 | C | 31/100 |
Who is the Fastest Internet Provider in Keystone?
According to unbiased feedback from real internet customers, they reported being happiest with speeds provided by AT&T. On the other hand, based on data provided by the internet providers to the FCC, Mt. Rushmore Telephone Company should have faster speeds at a local level. While we typically put more weight on real-world customer ratings, we display both satisfaction and technical maximum information for customers to decide for themselves.
Data Reported to FCC by ISPs: Average Maximum Available in Keystone
| Mt. Rushmore Telephone Company | 1,000 |
|---|---|
| Golden West Telecommunications | 1,000 |
| Verizon | 300 |
| Viasat | 100 |
| T-Mobile Home Internet | 100 |
| AT&T | 100 |
| EarthLink | 100 |
| CenturyLink | 60 |
| HughesNet | 25 |
How fast is your internet?
Test your connection here and see it next to the speeds providers advertise in Keystone. It takes about 20 seconds and, on a fast line, can move a few hundred MB of data.
Customer Ratings for Keystone Internet Providers
Based on 7 reviews from South Dakota internet customers, AT&T is the best internet service provider for Keystone residents. AT&T was rated at an average of 4.75 out of 5 in our report for overall customer satisfaction. Verizon wins for second-place in South Dakota, with 3.50 out of 5 stars and 57.0% coverage in Keystone.
At a national level, based on 2408 national reviews for any of the providers listed above, T-Mobile Home Internet is rated higher than any other provider, with a rating of 4.02 out of 5.
Local, State, and National Ratings for all Keystone Internet Providers
The table below shows average customer ratings from customers in Keystone, South Dakota, and customers throughout the country.
| ISP / Tech Type | Keystone Overall | South Dakota Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| AT&T | (0) |  (4) | (1051) | View Plans | ||
| Verizon | (0) | (2) | (816) | View Plans | ||
| Golden West Telecommunications | (0) |  (1) | (1) | View Plans | ||
| HughesNet | (0) | (0) |  (25) | View Plans | ||
| T-Mobile Home Internet | (0) | (0) | (342) | View Plans | ||
| EarthLink | (0) | (0) | (15) | View Plans | ||
| CenturyLink | (0) | (0) | (183) | View Plans | ||
| Viasat | (0) | (0) |  (12) | View Plans | ||
| Mt. Rushmore Telephone Company | (0) | (0) | (0) | View Plans |
Customer Ratings for Internet Provider Speeds in Keystone
Based on data reported by Keystone ISPs to the FCC, the fastest speeds in the city are available through Mt. Rushmore Telephone Company. The company offers speeds up to 1,000 Mbps in Keystone. Therefore, the average customer can get up to 892 Mbps if they’re willing to purchase the fastest subscription tier available at their homes.
However, actual customers rated their satisfaction with internet speed highest with AT&T. This indicates AT&T reliably delivers speeds expected by the customer based on the plan they are paying for.
| ISP / Tech Type | Keystone Speed | South Dakota Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| AT&T | (0) |  (4) | (1051) | View Plans | ||
| Verizon | (0) | (2) | (816) | View Plans | ||
| Golden West Telecommunications | (0) |  (1) | (1) | View Plans | ||
| HughesNet | (0) | (0) | (25) | View Plans | ||
| T-Mobile Home Internet | (0) | (0) | (342) | View Plans | ||
| CenturyLink | (0) | (0) | (183) | View Plans | ||
| EarthLink | (0) | (0) | (15) | View Plans | ||
| Viasat | (0) | (0) | (12) | View Plans | ||
| Mt. Rushmore Telephone Company | (0) | (0) | (0) | View Plans |
Who is the Cheapest Internet Provider in Keystone?
Of the providers in Keystone, customers rate AT&T the best for price. Data comes from customers rating their satisfaction with pricing: in Keystone where enough of them have reviewed a provider, otherwise across South Dakota or the country. This feedback is valuable because it considers price changes and whether the speeds paid for are worth it.
AT&T is rated 4.00 out of 5 for price, which is higher than the average across all internet providers in the country. Verizon is rated second for affordability, with an average price rating of 3.00 out of 5.
The table below shows how customers in Keystone, South Dakota, and the United States rated the affordability of their internet service.
Rated Affordability in Keystone
| ISP / Tech Type | Keystone Affordability | South Dakota Affordability | National Affordability | For Service | ||
|---|---|---|---|---|---|---|
| AT&T | (0) | (4) | (1051) | View Plans | ||
| Verizon | (0) | (2) | (816) | View Plans | ||
| Golden West Telecommunications | (0) | (1) | (1) | View Plans | ||
| HughesNet | (0) | (0) | (25) | View Plans | ||
| T-Mobile Home Internet | (0) | (0) | (342) | View Plans | ||
| CenturyLink | (0) | (0) | (183) | View Plans | ||
| EarthLink | (0) | (0) | (15) | View Plans | ||
| Viasat | (0) | (0) | (12) | View Plans | ||
| Mt. Rushmore Telephone Company | (0) | (0) | (0) | View Plans |
Customer Reviews for Internet Service Providers in South Dakota
Customer Reviews
ISPReports User
Midco Cable
October 02, 2026 Constant outages, and a lot more expensive than other providers.
A Brookings, SD Customer
Mediacom Cable
June 05, 2026 Brian M.
Bluepeak Fiber
June 01, 2026 The installation charge was too high and there are a lot of hidden fees and taxes.
Aaron M.
AT&T Fixed Wireless
May 29, 2026 My internet provider has been very reliable and consistent. I have used it on the go in many locations and it has rarely let me down. I am a very satisfied customer of AT&T and have nothing but praise for the service provided and the price point. I would highly recommend this service to everyone I know.
Dustin B.
Midco Fixed Wireless
April 14, 2026 They have good service, but their pricing is beyond sane. Basic cable runs $60 each room so to have basic cable in my home would cost $180. FOr basic cable. Basic non Wi Fi internet starts at $60 month. It's absolutely nuts how much it costs.
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Which ISP Should You Choose in Keystone?
The right ISP for you depends upon your needs, but in general we can make the following suggestions:
- The best all-around internet service provider in Keystone is AT&T.
- The fastest internet provider should be Mt. Rushmore Telephone Company. Considering speed for the money and reliability in speeds, AT&T may be a better choice based on real-world local customer feedback.
- The most affordable internet provider in Keystone is AT&T.
- Viasat, Mt. Rushmore Telephone Company, and HughesNet has the broadest coverage in Keystone, available to 87.1% of homes, and is most likely to cover your home. To find out exactly what’s available at your home, please use our address search tool.