Coverage · ZIP 57223
Internet Providers in Castlewood, SD (57223)
There are 11 internet providers available in Castlewood, SD (ZIP 57223), including ITC, Mediacom, T-Mobile Home Internet. Compare each provider below by technology, maximum advertised speed, and area coverage, then call (833) 261-0564 for help choosing a plan. Coverage data is sourced from the FCC National Broadband Map.
Internet providers in Castlewood, SD (ZIP 57223)
There are 11 residential internet providers available in Castlewood, SD (ZIP 57223), including ITC, Mediacom, T-Mobile Home Internet. The table below lists each provider with its technology type, maximum advertised speeds, and area coverage, sourced from the FCC National Broadband Map.
| Provider | Technology | Max download | Max upload | Area coverage |
|---|---|---|---|---|
| ITC | Fiber | 1 Gbps | 1 Gbps | 77% |
| Mediacom | Cable | 1 Gbps | 50 Mbps | 21% |
| T-Mobile Home Internet | 5G Home Internet | 100 Mbps | 20 Mbps | 45% |
| Midco | 5G Home Internet | 100 Mbps | 20 Mbps | 12% |
| AT&T Internet Air | 5G Home Internet | 30 Mbps | 3 Mbps | 11% |
| GigFire | Fixed Wireless | 150 Mbps | 130 Mbps | 52% |
| Wisp West, Celerity Internet | Fixed Wireless | 50 Mbps | 10 Mbps | 3% |
| Starlink | Satellite | 280 Mbps | 30 Mbps | 100% |
| Viasat | Satellite | 150 Mbps | 3 Mbps | 100% |
| HughesNet | Satellite | 100 Mbps | 5 Mbps | 100% |
| CenturyLink | DSL | 10 Mbps | 1 Mbps | 2% |
Internet in Castlewood, SD — common questions
How many internet providers are available in Castlewood, SD?
There are 11 internet providers available in Castlewood, SD (ZIP 57223), including ITC, Mediacom, T-Mobile Home Internet. Availability varies by exact address.
What is the fastest internet available in 57223?
ITC offers the highest advertised download speed in Castlewood, SD at up to 1 Gbps. Actual speeds depend on the plan and your address.
How do I check internet availability at my address in Castlewood, SD?
Enter your ZIP code on Ziatan to see every provider serving your block, then call (833) 261-0564 for help comparing plans and pricing — free, with no signup required.