Internet Speed Test in South Dakota

Run a Speed Test

South Dakota is served by Midco, CenturyLink/Quantum Fiber, and Alliance Communications. Whether you are on fiber, cable, or DSL, running a speed test tells you how your actual performance compares to what you are paying for.

Internet Providers in South Dakota

The main broadband providers serving South Dakota are Midco, CenturyLink/Quantum Fiber, and Alliance Communications. Coverage quality varies significantly depending on whether you are in an urban center or a rural area.

Fiber Internet in South Dakota

Sioux Falls, Rapid City, and Aberdeen have the strongest fiber coverage. Midco covers Sioux Falls and Rapid City with competitive cable and fiber service. Alliance Communications serves much of eastern South Dakota with community fiber. South Dakota has better rural coverage than many comparable states.

What Speeds to Expect in South Dakota

Typical speeds for South Dakota residents: 100–1000 Mbps on cable or fiber plans. Testing on Ethernet gives you a true baseline—Wi-Fi performance varies by distance from the router and interference from neighboring networks.

Best speeds: Fiber connections in metro areas—consistent performance with symmetric upload and download
Cable speeds: Fast download but lower upload; can slow during evening peak hours on shared networks
Rural speeds: DSL or fixed wireless typically deliver 25–100 Mbps; satellite (Starlink) is an option where wired service is unavailable

ISPs at a glance

Provider	Typical offering	Measured speed range
Midco	Fixed broadband (fiber / cable / DSL depending on address)	100–1000 Mbps
CenturyLink/Quantum Fiber	Fixed broadband (fiber / cable / DSL depending on address)	100–1000 Mbps
Alliance Communications	Fixed broadband (fiber / cable / DSL depending on address)	100–1000 Mbps

Measured speeds are wired-test ranges observed across consumer plans; actual figures depend on plan tier, address, and time of day. Always check each ISP's address-level availability tool for accurate plan and pricing information.

Speed Test Tips for South Dakota Residents

Test on Ethernet to measure your true connection speed, not Wi-Fi overhead
Run tests at both off-peak (morning) and peak (evening 7–10 PM) times—cable networks often show 20–40% lower speeds at peak hours
Check upload speed separately—upload is the bottleneck for video calls and cloud uploads, not just download
If your measured speed is consistently below 80% of your plan speed, contact your ISP or check for modem/router firmware updates

Frequently Asked Questions

What internet providers serve South Dakota?

Midco covers Sioux Falls, Rapid City, and other cities. Alliance Communications serves eastern SD communities with fiber. Quantum Fiber (CenturyLink) offers service in some markets. Rural SD relies on local telephone cooperatives.

Is fiber available in South Dakota?

Yes—Midco offers fiber in its markets. Alliance Communications has built fiber networks in many eastern SD communities. South Dakota has above-average rural fiber penetration compared to similar-sized states.

What speeds can South Dakota residents expect?

Sioux Falls and Rapid City residents get 200–1000 Mbps. Rural SD averages 100–500 Mbps from cooperative fiber or cable. South Dakota ranks above average for its population density in terms of broadband access.

What role do cooperatives play in South Dakota broadband?

Telephone cooperatives are major broadband providers in rural South Dakota. Alliance Communications is one of the most prominent, serving dozens of communities with fiber. These co-ops have invested heavily in rural connectivity where national ISPs have not.

How we measure

The speed ranges and ISP notes on this page combine publicly reported provider information with wired Ethernet tests run through SpeedTestHQ from South Dakota and comparable markets. Figures are directional, not a guarantee — your actual results depend on your specific plan, address, router, and time of day. See our accuracy methodology.