CenturyLink / Quantum Fiber internet in Castle Rock, CO
CenturyLink / Quantum Fiber reports service to about 92% of residential locations in Castle Rock, Colorado, which ranks it #2 of 11 providers with meaningful coverage. CenturyLink and Quantum Fiber are Lumen's consumer internet brands. They offer DSL in many areas and fiber (branded Quantum Fiber) where it has been built out.
How CenturyLink / Quantum Fiber compares in Castle Rock
| # | Provider | Technology (varies by address) | Locations covered |
|---|---|---|---|
| 1 | Xfinity | Cable | 99% |
| 2 | CenturyLink / Quantum Fiber | Fiber, DSL | 92% |
| 3 | Windfield Enterprises | Fixed wireless | 89% |
| 4 | Istari Holdings | Fixed wireless | 87% |
| 5 | T-Mobile Home Internet | Fixed wireless | 81% |
| 6 | BAM Broadband OpCo | Fiber, Fixed wireless | 75% |
| 7 | AT&T | Fiber, DSL, Fixed wireless | 48% |
| 8 | Verizon | Fiber, Fixed wireless | 44% |
Share of residential locations in Castle Rock where each provider reports service (FCC National Broadband Map, data as of December 31, 2025). See all providers in Castle Rock.
CenturyLink / Quantum Fiber vs other providers
What technologies are available in Castle Rock?
Fiber reaches about 27% of locations in Castle Rock, so it is available in parts of the area but not everywhere. Gigabit-class service (1,000 Mbps down) is reported for about 98% of locations. DSL is still reported for about 48% of locations, which can be a fallback where fiber and cable do not reach. Fixed wireless home internet is reported for about 99%+ of locations.
FCC National Broadband Map, data as of December 31, 2025: share of residential locations in Castle Rock that providers report they can serve. City-level figures, not your address.
CenturyLink / Quantum Fiber in places near Castle Rock
- Castle Pines, CO (99%)
- Parker, CO (93%)
- Lone Tree, CO (94%)
- Highlands Ranch, CO (90%)
- Centennial, CO (95%)
- Greenwood Village, CO (92%)
- Littleton, CO (97%)
- Columbine, CO (99%)
Plans and pricing
Plan prices and promotions change often and vary by address, so we do not list them. See CenturyLink / Quantum Fiber's current offers at your address with its availability checker.
Frequently asked questions
Is CenturyLink / Quantum Fiber available in Castle Rock?
CenturyLink / Quantum Fiber reports service to about 92% of residential locations in Castle Rock, per FCC data as of December 31, 2025. That ranks it #2 of 11 providers with meaningful coverage here. Availability depends on your exact address.
What type of internet does CenturyLink / Quantum Fiber offer in Castle Rock?
CenturyLink / Quantum Fiber offers fiber, dsl service across its footprint. The FCC summary does not say which technology reaches each address, so check your address with the provider.
Who are the main CenturyLink / Quantum Fiber competitors in Castle Rock?
Other providers reporting at least 10% coverage in Castle Rock include Xfinity (99%), Windfield Enterprises (89%), Istari Holdings (87%), T-Mobile Home Internet (81%).
How do I check CenturyLink / Quantum Fiber availability at my address?
Use CenturyLink / Quantum Fiber's own address checker, or enter your ZIP code here to compare all providers for your area.
Compare all providers for your ZIP code
All about CenturyLink / Quantum Fiber · Internet in Castle Rock · CenturyLink / Quantum Fiber in Colorado · Colorado · How we rank