Internet providers in Castle Rock, CO
Castle Rock is a town in Colorado with about 76,614 residents and roughly 31,934 residential locations that internet providers can report on. The table below compares the providers that report service here.
Compare internet providers in Castle Rock, CO
Share of residential locations in Castle Rock where each provider reports service, from the FCC National Broadband Map (data as of December 31, 2025). Availability depends on your exact address.
| # | 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% | Check availability |
| 8 | Verizon | Fiber, Fixed wireless | 44% | Check availability |
| 9 | Aerux LLP | Fixed wireless | 19% | |
| 10 | Concept Communications | Fiber, Fixed wireless | 5% |
Show 1 more provider with smaller coverage
| 11 | JAB Wireless | Fixed wireless | 3% |
Satellite internet
| 1 | HughesNet | Satellite | 99%+ | |
| 2 | Viasat | Satellite | 99%+ | |
| 3 | Starlink | Satellite | 99%+ |
Satellite service is available at nearly every address but typically has higher latency than wired options.
Provider-reported coverage does not guarantee service or speeds at a specific address. Some "Check availability" links are affiliate links; we may earn a commission at no cost to you. How we make money.
What to know about internet in Castle Rock
Xfinity reports service to the most residential locations in Castle Rock, about 99%. 6 providers report coverage of at least half of locations (Xfinity, CenturyLink / Quantum Fiber, Windfield Enterprises, Istari Holdings, T-Mobile Home Internet, and BAM Broadband OpCo), so the market looks competitive. Windfield Enterprises, Istari Holdings, and T-Mobile Home Internet offer fixed wireless home internet, an option if you prefer no cable or fiber installation.
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.
Castle Rock at a glance
About 97% of households in Castle Rock have a broadband subscription, 5 points above the Colorado average of 93%.
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2023).
Internet providers in places near Castle Rock
- Castle Pines, CO (6 mi)
- Parker, CO (8 mi)
- Lone Tree, CO (11 mi)
- Highlands Ranch, CO (13 mi)
- Centennial, CO (15 mi)
- Greenwood Village, CO (17 mi)
- Littleton, CO (17 mi)
- Columbine, CO (19 mi)
- Ken Caryl, CO (20 mi)
- Englewood, CO (20 mi)
- Monument, CO (21 mi)
- Four Square Mile, CO (21 mi)
- Dakota Ridge, CO (23 mi)
- Black Forest, CO (24 mi)
- Aurora, CO (24 mi)
- Lakewood, CO (26 mi)
- Denver, CO (27 mi)
- Wheat Ridge, CO (30 mi)
- Berkley, CO (31 mi)
- Golden, CO (32 mi)
Frequently asked questions
Is fiber internet available in Castle Rock?
Yes, in part. About 27% of residential locations in Castle Rock can get fiber, 95% can get cable, and about 98% can get gigabit-class speeds, per FCC data. Availability depends on your exact address.
Which internet provider has the widest coverage in Castle Rock?
Xfinity reports service to about 99% of residential locations in Castle Rock, the most of any provider, per FCC data. Availability still depends on your address.
How many internet providers serve Castle Rock?
11 providers report service to at least 2% of locations in Castle Rock, and 6 cover at least half. Satellite (HughesNet, Viasat, Starlink) is also available nearly everywhere.
What is the difference between fiber, cable and DSL?
Fiber offers the fastest and most consistent speeds, cable is widely available with high download speeds, and DSL runs over phone lines and is usually slower. See our guide for details.
What internet speed do I need in Castle Rock?
Most households are well served by 100–300 Mbps. Heavy streaming, gaming or many connected devices may benefit from 500 Mbps or more.
Check your exact address
Coverage for a whole community cannot tell you what is available at your door. Enter your ZIP code, then confirm with each provider.
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