In Castlewood there is 1 residential Cable provider covering 62.20% of the city. 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.
This page contains all Cable internet providers in Castlewood, SD.
To see availability maps for all providers including fiber, cable, DSL, and more in Castlewood, SD please click below.
Castlewood, SD Availability Maps
Cable Internet Service Provider in Castlewood
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 Castlewood are not shown.
Castlewood 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 Castlewood is cable internet available?
Cable Internet Availability Key
Cable is available in 62.20% of Castlewood. Areas in green have cable internet service, where areas in yellow or red may not. The most widely available provider is Mediacom. Call one of the companies with service in Castlewood above to see who has service at your home.
How fast is cable internet in Castlewood?
The map below shows maximum cable internet speeds by area in Castlewood.
Cable Internet Speed Key
The average Castlewood home can get up to 1,000 Mbps on their cable internet plan. The fastest cable download speed in the city is 1,000 Mbps, which 62.20% of residents can get.
Is cable the fastest internet I can get in Castlewood?
The fastest internet for you may vary based on where in Castlewood you live. In general, fiber competes most often with cable in the city.
- Fiber is the fastest internet type for 99.91% of Castlewood homes.
- Cable is fastest for less than 1% of the city.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for less than 1%.
- Satellite internet may be the only option for less than 1% of Castlewood homes.
Cable Providers in Depth
Below you'll find which TV and internet providers offer service in Castlewood, along with details on where in Castlewood and at what speeds.
Mediacom Cable in Castlewood, SD
Mediacom cable coverage
About 62.20%, or 706 people, have Mediacom cable internet available to them in the city. The company covers the central, northwest, west, north, south, southwest, and east Castlewood area. Mediacom is one of the largest internet service providers internet service providers in the US, with internet service available in a majority of Castlewood.
Mediacom cable download speeds
Mediacom is one of the fastest when comparing download speeds to all other internet providers in Castlewood. Versus other cable providers in the area, Mediacom cable is the fastest. There are no different maximum speeds throughout Castlewood. The fastest plan anyone in Castlewood can order from Mediacom goes up to 1,000 Mbps, and all Castlewood customers can get this speed.
Show all download speeds
- 100.0% up to 1,000.0 Mbps
Mediacom cable upload speeds
In Castlewood download speeds tend to be faster than than upload speeds for Mediacom cable. Compared to other ISPs, Mediacom is below average where upload speeds are concerned, and the fastest compared to other Castlewood cable providers. Mediacom offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castlewood is up to 50 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 50.0 Mbps
Castlewood Cable by Area
This information is most helpful to those looking for homes or considering moving to Castlewood or any of the areas nearby.
How does cable internet in Castlewood compare to the rest of South Dakota?
Cable internet speeds in Castlewood are much faster versus the average speeds in South Dakota: 0.00 Mbps in South Dakota versus 1,000 Mbps in the city. The state has similar cable availability compared to the city. Average cable coverage in South Dakota is 0.00% versus 62.20% in Castlewood.
What zip codes have cable internet?
Cable internet coverage varies by zip code and neighborhood. Some examples in or around Castlewood are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does cable 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
- Estelline, SD: less cable coverage, similar speeds
- Hayti, SD: less cable coverage, similar speeds
- Foley, SD: less cable coverage, faster speeds
- Watertown, SD: more cable coverage, faster speeds
- Lake Norden, SD: more cable coverage, similar speeds
- Rauville, SD: more cable coverage, faster speeds
- Kampeska, SD: less cable coverage, faster speeds
- Bruce, SD: less cable coverage, similar speeds
- Waverly, SD: less cable coverage, faster speeds
- kones-corner-sd: less cable coverage, slower speeds
Cities with Similar Populations
- Dover Beaches South, NJ: more cable coverage, slower speeds
- Walhonding, OH: less cable coverage, similar speeds
- Waterford, VT: less cable coverage, similar speeds
- Elwood, KS: more cable coverage, slower speeds
- East Victor, NY: more cable coverage, similar speeds
- Dysart, PA: more cable coverage, faster speeds
- Wagners Lake, NE: less cable coverage, similar speeds
- Donnelsville, OH: more cable coverage, similar speeds
- Deerfield, MA: more cable coverage, faster speeds
- DeBord, KY: more cable coverage, slower speeds