In 57521 there are 5 residential internet providers covering 73.36% of the zip. The average home can get speeds up to 956 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.
Jump to Availability Maps
5 Internet Service Providers in 57521
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 57521 are not shown.
57521 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 57521
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.
Please note some providers will take longer to load than others
Internet service is available in 73.36% of 57521. 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 Golden West Telecommunications. Now you can call companies in 57521 with more confidence that they might be available.
How fast are internet speeds in 57521?
The map below shows maximum internet speeds by area in 57521.
Internet Speed Key
The average 57521 home can get up to 956 Mbps on their internet plan. For most people, the fastest download speed in the zip is 1,000 Mbps, which 70.09% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 3.27% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in 57521.
Internet speeds tend to be faster in the northwest parts of 57521, and slower in the southeast areas of the zip.
What type of internet should I choose in 57521?
The fastest internet for you may vary based on where in 57521 you live. If speed is your main concern, fiber will be the fastest internet in the zip.
- Fiber is the fastest internet type for 70.09% of 57521 homes.
- Cable is fastest for less than 1% of the zip.
- DSL is fastest for 3.27%.
- Fixed wireless is fastest for less than 1%.
- Satellite internet may be the only option for 26.64% of 57521 homes.
Internet Market Health in 57521
Internet Competition Key
The map shows how competitive the 57521 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 57521 based on what connections the average home has availabile:
- Average number of internet service providers to a home: 2.3 (very unhealthy)
- Average types of service (fiber, cable, DSL, etc): 1.9 (very unhealthy)
- Average providers with broadband (25 Mbps+) speeds: 2.3 (very unhealthy)
Overall, competition is very unhealthy.
57521 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, 57521 homes have between 1 and 2 options. The type(s) of service available are fiber, fixed wireless, and dsl, 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. 57521 internet customers who want faster speeds have between 0 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, 57521 badly needs improvement.
TV & Internet Providers in Depth
Below you'll find which TV and internet providers offer service in 57521, along with details on where in 57521 and at what speeds.
Golden West Telecommunications Fiber in 57521, SD
Golden West Telecommunications fiber coverage
About 70.09%, or 150 people, have Golden West Telecommunications fiber internet available to them in the zip. The company covers the northwest, south, west, north, east, and southwest 57521 area. Golden West Telecommunications is a large internet service provider internet service providers in the US, with internet service available in much of 57521.
Golden West Telecommunications fiber download speeds
Golden West Telecommunications is the fastest when comparing download speeds to all other internet providers in 57521. Versus other fiber providers in the area, Golden West Telecommunications fiber is the fastest. There are no different maximum speeds throughout 57521. The fastest plan anyone in 57521 can order from Golden West Telecommunications goes up to 1,000 Mbps, and all 57521 customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Golden West Telecommunications fiber upload speeds
In 57521 download speeds tend to be equal to than upload speeds for Golden West Telecommunications fiber. Compared to other ISPs, Golden West Telecommunications is the fastest where upload speeds are concerned, and the fastest compared to other 57521 fiber providers. Golden West Telecommunications offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 57521 is up to 1,000 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1,000.0 Mbps
Golden West Telecommunications DSL in 57521, SD
Golden West Telecommunications DSL coverage
About 21.03%, or 45 people, have Golden West Telecommunications DSL internet available to them in the zip. The company covers the south, southwest, and southeast 57521 area. Golden West Telecommunications is a large internet service provider internet service providers in the US, with internet service available in a small portion of 57521.
Golden West Telecommunications DSL download speeds
Golden West Telecommunications is the slowest when comparing download speeds to all other internet providers in 57521. Versus other DSL providers in the area, Golden West Telecommunications DSL is the fastest. There are 2 different maximum speeds throughout 57521. The fastest plan anyone in 57521 can order from Golden West Telecommunications goes up to 25 Mbps, the slowest package only goes up to 10 Mbps, and the zip-wide average maximum speed for 57521 customers is up to 22 Mbps.
Show all download speeds
- 77.8% up to 25.0 Mbps
- 22.2% up to 10.0 Mbps
Golden West Telecommunications DSL upload speeds
In 57521 download speeds tend to be faster than than upload speeds for Golden West Telecommunications DSL. Compared to other ISPs, Golden West Telecommunications is the slowest where upload speeds are concerned, and the fastest compared to other 57521 DSL providers. Golden West Telecommunications offers 2 different upload speeds across the zip, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in 57521 is up to 3.0 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, Golden West Telecommunications customers can get speeds up to 2.6 Mbps.
Show all upload speeds
- 77.8% up to 3.0 Mbps
- 22.2% up to 1.0 Mbps
T-Mobile Home Internet Fixed Wireless in 57521, SD
T-Mobile Home Internet fixed wireless coverage
About 49.07%, or 105 people, have T-Mobile Home Internet fixed wireless internet available to them in the zip. The company covers the northwest, west, north, southwest, and south 57521 area. T-Mobile Home Internet is one of the largest internet service providers internet service providers in the US, with internet service available in some of 57521.
T-Mobile Home Internet fixed wireless download speeds
T-Mobile Home Internet is below average when comparing download speeds to all other internet providers in 57521. Versus other fixed wireless providers in the area, T-Mobile Home Internet fixed wireless is the slowest. There are 2 different maximum speeds throughout 57521. The fastest plan anyone in 57521 can order from T-Mobile Home Internet goes up to 100 Mbps, the slowest package only goes up to 25 Mbps, and the zip-wide average maximum speed for 57521 customers is up to 68 Mbps.
Show all download speeds
- 57.1% up to 100.0 Mbps
- 42.9% up to 25.0 Mbps
T-Mobile Home Internet fixed wireless upload speeds
In 57521 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 57521 fixed wireless providers. T-Mobile Home Internet offers 2 different upload speeds across the zip, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in 57521 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 13 Mbps.
Show all upload speeds
- 57.1% up to 20.0 Mbps
- 42.9% up to 3.0 Mbps
Verizon Fixed Wireless in 57521, SD
Verizon fixed wireless coverage
About 30.84%, or 66 people, have Verizon fixed wireless internet available to them in the zip. The company covers the northwest, west, north, and south 57521 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 57521.
Verizon fixed wireless download speeds
Verizon is average when comparing download speeds to all other internet providers in 57521. Versus other fixed wireless providers in the area, Verizon fixed wireless is the fastest. There are no different maximum speeds throughout 57521. The fastest plan anyone in 57521 can order from Verizon goes up to 300 Mbps, and all 57521 customers can get this speed.
Show all download speeds
- 100.0% up to 300.0 Mbps
Verizon fixed wireless upload speeds
In 57521 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 57521 fixed wireless providers. Verizon offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 57521 is up to 20 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 20.0 Mbps
57521 Internet by Area
This information is most helpful to those looking for homes or considering moving to 57521 or any of the areas nearby.
How does internet in 57521 compare to the rest of South Dakota?
Internet speeds in 57521 are slower versus the average speeds in South Dakota: 1,953 Mbps in South Dakota versus 956 Mbps in the zip. The state has far less internet availability compared to the zip. Average internet coverage in South Dakota is 98.12% versus 73.36% in 57521.
What zip codes have widespread internet?
Internet coverage varies by zip code and neighborhood. Some examples in or around 57521 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
- 57543, SD: more internet coverage, faster speeds
- 57562, SD: more internet coverage, faster speeds
- 57559, SD: more internet coverage, faster speeds
- 57568, SD: more internet coverage, faster speeds
- 57780, SD: more internet coverage, slower speeds
- 57569, SD: more internet coverage, faster speeds
- 57365, SD: more internet coverage, faster speeds
- 57325, SD: more internet coverage, faster speeds
- 57738, SD: more internet coverage, slower speeds
- 57744, SD: more internet coverage, faster speeds
Zip Codes with Similar Populations
- 73032, OK: more internet coverage, faster speeds
- 56637, MN: more internet coverage, faster speeds
- 57251, SD: more internet coverage, faster speeds
- 57553, SD: more internet coverage, slower speeds
- 58008, ND: more internet coverage, faster speeds
- 58317, ND: more internet coverage, faster speeds
- 58361, ND: more internet coverage, faster speeds
- 58479, ND: more internet coverage, faster speeds
- 59713, MT: more internet coverage, slower speeds
- 61936, IL: more internet coverage, slower speeds