In 57621 there are 4 residential internet providers covering 95.60% of the zip. The average home can get speeds up to 1,000 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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4 Internet Service Providers in 57621
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 57621 are not shown.
57621 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 57621
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 95.60% of 57621. 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 WRT. Now you can call companies in 57621 with more confidence that they might be available.
How fast are internet speeds in 57621?
The map below shows maximum internet speeds by area in 57621.
Internet Speed Key
The average 57621 home can get up to 1,000 Mbps on their internet plan. For most people, the fastest download speed in the zip is 1,000 Mbps, which 95.60% of residents can get.
What type of internet should I choose in 57621?
The fastest internet for you may vary based on where in 57621 you live. If speed is your main concern, fiber will be the fastest internet in the zip.
- Fiber is the fastest internet type for 95.60% of 57621 homes.
- Cable is fastest for less than 1% of the zip.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for less than 1%.
- Satellite internet may be the only option for 4.40% of 57621 homes.
Internet Market Health in 57621
Internet Competition Key
The map shows how competitive the 57621 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 57621 based on what connections the average home has availabile:
- Average number of internet service providers to a home: 2.0 (very unhealthy)
- Average types of service (fiber, cable, DSL, etc): 2.0 (very unhealthy)
- Average providers with broadband (25 Mbps+) speeds: 1.0 (very unhealthy)
Overall, competition is very unhealthy.
57621 internet customers have the ability to buy internet service from 1 to 2 different providers, depending on where they live. For different types of service, 57621 homes have between 1 and 2 options. The type(s) of service available are fiber and fixed wireless, though these may vary depending on the region within the zip.
When it comes to broadband download speeds faster than 25 Mbps, the situation is worse. 57621 internet customers who want faster speeds have 1 choice 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, 57621 badly needs improvement.
TV & Internet Providers in Depth
Below you'll find which TV and internet providers offer service in 57621, along with details on where in 57621 and at what speeds.
WRT Fiber in 57621, SD
WRT fiber coverage
About 95.60%, or 304 people, have WRT fiber internet available to them in the zip. The company covers the entire 57621 area. WRT is an average-sized internet service provider internet service providers in the US, with internet service available in most of 57621.
WRT fiber download speeds
WRT is the fastest when comparing download speeds to all other internet providers in 57621. Versus other fiber providers in the area, WRT fiber is the fastest. There are no different maximum speeds throughout 57621. The fastest plan anyone in 57621 can order from WRT goes up to 1,000 Mbps, and all 57621 customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
WRT fiber upload speeds
In 57621 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 57621 fiber providers. WRT offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 57621 is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Standing Rock Telecommunications Fixed Wireless in 57621, SD
Standing Rock Telecom fixed wireless coverage
About 95.28%, or 303 people, have Standing Rock Telecom fixed wireless internet available to them in the zip. The company covers the north, east, central, and northeast 57621 area. Standing Rock Telecom is a small internet service provider internet service providers in the US, with internet service available in most of 57621.
Standing Rock Telecommunications fixed wireless download speeds
Standing Rock Telecom is the slowest when comparing download speeds to all other internet providers in 57621. Versus other fixed wireless providers in the area, Standing Rock Telecom fixed wireless is the fastest. There are no different maximum speeds throughout 57621. The fastest plan anyone in 57621 can order from Standing Rock Telecom goes up to 10 Mbps, and all 57621 customers can get this speed.
Show all download speeds
- 100.0% up to 10.0 Mbps
Standing Rock Telecommunications fixed wireless upload speeds
In 57621 download speeds tend to be faster than than upload speeds for Standing Rock Telecom fixed wireless. Compared to other ISPs, Standing Rock Telecom is the slowest where upload speeds are concerned, and the fastest compared to other 57621 fixed wireless providers. Standing Rock Telecom offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 57621 is up to 1.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1.0 Mbps
57621 Internet by Area
This information is most helpful to those looking for homes or considering moving to 57621 or any of the areas nearby.
How does internet in 57621 compare to the rest of South Dakota?
Internet speeds in 57621 are slower versus the average speeds in South Dakota: 1,953 Mbps in South Dakota versus 1,000 Mbps in the zip. The state has similar internet availability compared to the zip. Average internet coverage in South Dakota is 98.12% versus 95.60% in 57621.
What zip codes have widespread internet?
Internet coverage varies by zip code and neighborhood. Some examples in or around 57621 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 zip codes?
Below are zip codes nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Zip Codes
- 57639, SD: more internet coverage, similar speeds
- 57642, SD: more internet coverage, slower speeds
- 57660, SD: less internet coverage, slower speeds
- 57658, SD: more internet coverage, similar speeds
- 57634, SD: less internet coverage, slower speeds
- 57646, SD: more internet coverage, similar speeds
- 57632, SD: more internet coverage, similar speeds
- 57437, SD: more internet coverage, similar speeds
- 57640, SD: more internet coverage, slower speeds
- 57457, SD: more internet coverage, similar speeds
Zip Codes with Similar Populations
- 42326, KY: more internet coverage, faster speeds
- 82710, WY: less internet coverage, slower speeds
- 82329, WY: less internet coverage, slower speeds
- 81656, CO: more internet coverage, faster speeds
- 81655, CO: less internet coverage, slower speeds
- 81121, CO: more internet coverage, slower speeds
- 81071, CO: less internet coverage, slower speeds
- 80834, CO: more internet coverage, similar speeds
- 79741, TX: less internet coverage, slower speeds
- 79719, TX: more internet coverage, slower speeds