BroadbandByZIP

Xfinity vs CenturyLink / Quantum Fiber

By the BroadbandByZIP editorial team · Updated September 2026 · How we make money

This comparison uses FCC coverage data: what each provider reports offering and how widely. It does not compare prices, which change often; check current offers with each provider.

XfinityCenturyLink / Quantum Fiber
Technologies offeredCableFiber, DSL
Cities with 50%+ coverage6,5992,766
Cities with 10%+ coverage6,8753,031
Strongest statesPennsylvania, Florida, New JerseyColorado, Minnesota, Washington

Where both are available

Xfinity and CenturyLink / Quantum Fiber both report service to at least half of residential locations in about 749 US cities.

Where Xfinity has the edge

Where CenturyLink / Quantum Fiber has the edge

See which one serves your area

Frequently asked questions

Is Xfinity or CenturyLink / Quantum Fiber more widely available?

In FCC data, Xfinity reports service to at least half of residential locations in more cities (6,599 versus 2,766). Availability at your address is what matters, so check both.

Do Xfinity and CenturyLink / Quantum Fiber compete in the same areas?

They both report service to at least half of residential locations in about 749 US cities, so many households can choose between them.

How do I decide between Xfinity and CenturyLink / Quantum Fiber?

Confirm which of the two serves your address, compare the current price after any promotion, and check contract terms, equipment fees and data caps. Fiber generally beats other technologies on upload speed and consistency.

What would you like to do next?

Find my best providerAnswer a few questions and get a ranked shortlist for your ZIP code. Test my speedMeasure your download, upload and latency in 30 seconds. Compare two placesMoving? See fiber, cable and providers in two ZIP codes side by side. See the rankingsWhich cities and states have the most fiber and best-connected homes.