Internet Providers in Castle Rock

Castle Rock has two fiber providers, Quantum Fiber and CenturyLink. Symmetric speeds of 8,000 Mbps are available in parts of the city.

Fiber

Provider	DownDownload (Mbps)	UpUpload (Mbps)	AvailabilityCoverage
Quantum Fiber	8,000	8,000	51%
CenturyLink	2,000	1,000	37%

Cable

Provider	DownDownload (Mbps)	UpUpload (Mbps)	AvailabilityCoverage
Xfinity	2,000	250	98%

DSL

Provider	DownDownload (Mbps)	UpUpload (Mbps)	AvailabilityCoverage
CenturyLink	140	40	63%

Fixed Wireless

Provider	DownDownload (Mbps)	UpUpload (Mbps)	AvailabilityCoverage
Kellin Communications	1,000	220	100%
BAM	1,000	100	93%
Verizon	300	20	96%
Aerux	100	100	75%
Xtream Internet	100	40	100%
MINTernet	100	20	99%
T-Mobile	100	20	99%
AT&T	100	20	95%
Rise	100	20	8%

Next-Gen Satellite

Provider	DownDownload (Mbps)	UpUpload (Mbps)	AvailabilityCoverage
Starlink	280	30	100%

Old-School Satellite

Provider	DownDownload (Mbps)	UpUpload (Mbps)	AvailabilityCoverage
Viasat	150	3	100%
HughesNet	50	5	100%

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Low-Availability Internet Options

Provider	TechnologyTech	Download (Mbps)	Upload (Mbps)	AvailabilityCoverage
Aerux	Fiber	10,000	10,000	2%
Thrive	Fiber	2,000	2,000	<0.1%
Xfinity	Fiber	2,000	250	1%
Visionary	Fixed WirelessFixed Wireless	200	20	3%

Broadband Map's availability estimates are based on the census boundaries of Castle Rock. Speed metrics capture internet providers' maximum advertised speeds. Both may be overoptimistic.

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Data Sourcing

Broadband Map's listings of internet providers in Castle Rock rely primarily on the November 2025 release from the FCC's Broadband Data Collection program (representing Castle Rock ISPs' availability as of June 2025).