In 57321 there are 5 residential internet providers covering 97.42% 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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5 Internet Service Providers in 57321
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 57321 are not shown.
57321 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 57321
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 97.42% of 57321. 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 TrioTel Communications. Now you can call companies in 57321 with more confidence that they might be available.
How fast are internet speeds in 57321?
The map below shows maximum internet speeds by area in 57321.
Internet Speed Key
The average 57321 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 97.42% of residents can get.
What type of internet should I choose in 57321?
The fastest internet for you may vary based on where in 57321 you live. If speed is your main concern, fiber will be the fastest internet in the zip.
- Fiber is the fastest internet type for 97.42% of 57321 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 2.58% of 57321 homes.
Internet Market Health in 57321
Internet Competition Key
The map shows how competitive the 57321 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 57321 based on what connections the average home has availabile:
- Average number of internet service providers to a home: 1.5 (very unhealthy)
- Average types of service (fiber, cable, DSL, etc): 1.5 (very unhealthy)
- Average providers with broadband (25 Mbps+) speeds: 1.5 (very unhealthy)
Overall, competition is very unhealthy.
57321 internet customers have the ability to buy internet service from 1 to 3 different providers, depending on where they live. For different types of service, 57321 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 similar. 57321 internet customers who want faster speeds have between 1 and 3 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, 57321 badly needs improvement.
TV & Internet Providers in Depth
Below you'll find which TV and internet providers offer service in 57321, along with details on where in 57321 and at what speeds.
TrioTel Communications Fiber in 57321, SD
TrioTel Communications fiber coverage
About 96.65%, or 375 people, have TrioTel Communications fiber internet available to them in the zip. The company covers the entire 57321 area. TrioTel Communications is a small internet service provider internet service providers in the US, with internet service available in most of 57321.
TrioTel Communications fiber download speeds
TrioTel Communications is one of the fastest when comparing download speeds to all other internet providers in 57321. Versus other fiber providers in the area, TrioTel Communications fiber is one of the fastest. There are no different maximum speeds throughout 57321. The fastest plan anyone in 57321 can order from TrioTel Communications goes up to 1,000 Mbps, and all 57321 customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
TrioTel Communications fiber upload speeds
In 57321 download speeds tend to be equal to than upload speeds for TrioTel Communications fiber. Compared to other ISPs, TrioTel Communications is one of the fastest where upload speeds are concerned, and one of the fastest compared to other 57321 fiber providers. TrioTel Communications offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 57321 is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Verizon Fixed Wireless in 57321, SD
Verizon fixed wireless coverage
About 44.33%, or 172 people, have Verizon fixed wireless internet available to them in the zip. The company covers the entire 57321 area. Verizon is one of the largest internet service providers internet service providers in the US, with internet service available in some of 57321.
Verizon fixed wireless download speeds
Verizon is below average when comparing download speeds to all other internet providers in 57321. Versus other fixed wireless providers in the area, Verizon fixed wireless is the fastest. There are no different maximum speeds throughout 57321. The fastest plan anyone in 57321 can order from Verizon goes up to 300 Mbps, and all 57321 customers can get this speed.
Show all download speeds
- 100.0% up to 300.0 Mbps
Verizon fixed wireless upload speeds
In 57321 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 57321 fixed wireless providers. Verizon offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 57321 is up to 20 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 20.0 Mbps
T-Mobile Home Internet Fixed Wireless in 57321, SD
T-Mobile Home Internet fixed wireless coverage
About 3.35%, or 13 people, have T-Mobile Home Internet fixed wireless internet available to them in the zip. The company covers the south and northwest 57321 area. T-Mobile Home Internet is one of the largest internet service providers internet service providers in the US, with internet service available in a very small piece of 57321.
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 57321. Versus other fixed wireless providers in the area, T-Mobile Home Internet fixed wireless is the slowest. There are no different maximum speeds throughout 57321. The fastest plan anyone in 57321 can order from T-Mobile Home Internet goes up to 25 Mbps, and all 57321 customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
T-Mobile Home Internet fixed wireless upload speeds
In 57321 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 the slowest where upload speeds are concerned, and the slowest compared to other 57321 fixed wireless providers. T-Mobile Home Internet offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 57321 is up to 3.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 3.0 Mbps
57321 Internet by Area
This information is most helpful to those looking for homes or considering moving to 57321 or any of the areas nearby.
How does internet in 57321 compare to the rest of South Dakota?
Internet speeds in 57321 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 97.42% in 57321.
What zip codes have widespread internet?
Internet coverage varies by zip code and neighborhood. Some examples in or around 57321 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
- 57374, SD: less internet coverage, similar speeds
- 57076, SD: more internet coverage, similar speeds
- 57058, SD: more internet coverage, similar speeds
- 57337, SD: more internet coverage, similar speeds
- 57340, SD: more internet coverage, similar speeds
- 57048, SD: more internet coverage, similar speeds
- 57314, SD: more internet coverage, similar speeds
- 57301, SD: more internet coverage, faster speeds
- 57075, SD: more internet coverage, faster speeds
- 57359, SD: more internet coverage, similar speeds
Zip Codes with Similar Populations
- 41201, KY: more internet coverage, similar speeds
- 80929, CO: more internet coverage, faster speeds
- 78563, TX: less internet coverage, faster speeds
- 78561, TX: more internet coverage, similar speeds
- 76491, TX: less internet coverage, slower speeds
- 74827, OK: less internet coverage, slower speeds
- 73842, OK: more internet coverage, slower speeds
- 73569, OK: less internet coverage, slower speeds
- 73530, OK: more internet coverage, slower speeds
- 49335, MI: more internet coverage, similar speeds