Internet Providers in Castlewood, SD

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Residential Internet Statistics for Castlewood, SD
Internet Providers: 7
Internet Plans: 9
Fastest Speed Available: 1,000 Mbps
Average Plan Price: $117.75

Internet Access in Castlewood, South Dakota

The most frequently available wired network options within Castlewood are DSL networks and Satellite networks. FCC filings show that DSL has a 2.29 percent spread, compared with Satellite's close to one hundred percent availability.

Broadband competition in the Castlewood area is high, with most homes having 3-4 providers available to them. Internet access isn't spread out equally — as a surprising 52.06 percent of addresses in the area are still limited to one option.

Interstate Telecommunications Cooperative is also a commonly available Internet option for Castlewood. They offer Fiber service with coverage in 98 percent of the area. RC Technologies offers an alternative wireless service to practically one hundred percent of Castlewood. Keep in mind that this option has to have roof access and proximity to a RC Technologies tower or access point.

Since FCC data is currently only collected twice annually and only published six months after filing, providers shown above may not include the most recent expansions.

Viasat Internet is the most widespread Internet option overall, with coverage for virtually one hundred percent of Castlewood residents. HughesNet has registered availability for practically one hundred percent of residents. The top download speed advertised for Viasat is 35 Mbps, while HughesNet advertised up to 25 Mbps. As a rule, anything above 10 megabits per second (Mbps) is enough to stream SD videos on WiFi, but is likely to become an issue for multiple users or high-bandwidth services such as video chat and multiplayer gaming. Explore the availability map on this page to see how broadband coverage compares at the census block level in Castlewood.

  • There are 10 internet providers in Castlewood with 7 of those offering residential service
  • Castlewood is the 121st most connected city in South Dakota ahead of Brookings and Clear Lake, but behind Watertown, Arlington, and Volga.
  • The fastest zip code in Castlewood for April 2021 is 57223. (see all below).

Internet Statistics 2021



Castlewood, SD

700 People Only have access to 1 or fewer wired internet providers available at their address.

This data is calculated from FCC datasets which providers are legally required to supply twice a year. We further validate this data for accuracy.

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Summary Of Fastest Internet Providers In Castlewood, South Dakota

Provider Speed Type Time To Download 1 GB
Mediacom Cable 1,000 Mbps Cable 8s
Interstate Telecommunications Cooperative 1,000 Mbps Fiber 8s
Viasat Internet 50 Mbps Satellite 2m 43s
HughesNet 25 Mbps Satellite 5m 27s
CenturyLink 100 Mbps DSL 1m 21s

Summary of Internet Providers Availability in Castlewood, South Dakota

  • Interstate Telecommunications Cooperative - Fiber - 98.9% Availability in Castlewood - Speeds up to 1,000 Mbps
  • Mediacom - Cable - 46.8% Availability in Castlewood - Speeds up to 1,000 Mbps
  • CenturyLink - DSL - 2.3% Availability in Castlewood - Speeds up to 100 Mbps
  • Viasat - Satellite - 100.0% Availability in Castlewood - Speeds up to 50 Mbps
  • HughesNet - Satellite - 100.0% Availability in Castlewood - Speeds up to 25 Mbps

Internet Provider Competition Map For Castlewood

Castlewood Internet Competition Map. Click for interactive map.
Click here to initialize interactive map
Castlewood is the 121st most connected city in South Dakota ahead of Brookings and Clear Lake, but behind Watertown, Arlington, and Volga.

The “Connected” metric is a citywide average based on FCC data showing the density of broadband options at the census block level.

Approximately 15 people in Hamlin County don't have access to any wired internet.

This statistic is drawn from the population in census blocks not served by at least one wired broadband provider.

Fiber Availability: 99% of people living in Castlewood have residential fiber service available to them.

Fiber coverage data is sourced from FCC Form 477 filings and cross-validated through BroadbandNow with private datasets and direct provider reporting.

Approximately 48% of Castlewood residents are serviced by multiple wired providers.

This coverage statistic is based on a mix of FCC and private provider reporting in the past two quarters.

As of this month, 57223 is the zip code with the fastest average download speed in Castlewood.

Zip-based speed averages are calculated from M-Labs consumer speed tests run by IP addresses in the area.

In Hamlin County, approximately 800 people do not have access to 25 Mbps wired broadband.

25 Mbps download and 3 Mbps upload is the minimum speed for an Internet connection to be classified as “Broadband” by the FCC.

Data Caps Among Castlewood Internet Service Providers

Many Internet providers have been moving to increase the use of "data caps" to their home broadband plans lately. The trend is certainly true for the Castlewood market, with common ISPs like Mediacom selling capped plans. This won't matter for the majority of Internet subscribers, but might affect users that download or upload a lot of high-def content. If you have data use concerns, start by checking for fiber plans in your area using the search tool at the top of this page. Fiber is frequently a bit higher priced, but can offer unlimited data and streaming because the fiber infrastructure doesn't share cable or DSL's bandwidth ceiling.

Summary Of Internet Providers In Castlewood

Provider Type Coverage Speed
RC Technologies Fixed Wireless 100% 20 Mbps
Interstate Telecommunications Cooperative Fiber 98.9%+ 1,000 Mbps
Data Truck Fixed Wireless 92.7%+ 40 Mbps
Mediacom Cable Cable 46.8%+ 1,000 Mbps
CenturyLink DSL 2.3%+ 100 Mbps
Viasat Internet Satellite 100% 50 Mbps
HughesNet Satellite 100% 25 Mbps
Data Truck Fixed Wireless 87.1%+ 40 Mbps
Mediacom Business Cable 1.2%+ 1,000 Mbps

Compare Castlewood to the 5 largest cities in the US

City Average Download Speed Number of Providers Average Cost per Mbps
Castlewood 39.2 Mbps 7 $0.68 ( + $0.00 )
New York 415.4 Mbps ( +376.2 Mbps ) 16 ( +9 ) $0.70 ( + $0.00 )
Los Angeles 118.9 Mbps ( +79.7 Mbps ) 17 ( +10 ) $0.25 ( $0.00 )
Chicago 116.2 Mbps ( +77 Mbps ) 15 ( +8 ) $0.27 ( $0.00 )
Houston 127.4 Mbps ( +88.2 Mbps ) 23 ( +16 ) $0.27 ( $0.00 )
Philadelphia 127.6 Mbps ( +88.4 Mbps ) 8 ( +1 ) $0.37 ( $0.00 )