Best Internet Providers in Castle Rock, CO
All 14 providers, ranked by coverage, speed and customer ratings
Find internet availability by address in Castle Rock, CO
Castle Rock has 14 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, Cable, Fixed Wireless, and DSL internet are available in the city. Reviews are grouped by provider and the type of service they offer, covering all 4 available internet technologies in Castle Rock.
Ranks compare Castle Rock with the 749 US small cities (50,000 to 99,999 people), the tiers of our fastest-cities rankings.
The Best Internet in Castle Rock, CO at a Glance
Castle Rock Internet Providers, Ranked by Coverage, Speed and Customer Ratings
XFINITY
Connection
Customer Rating
Fiber
Cable
CenturyLink
Connection
Customer Rating
Fiber
DSL
Quantum Fiber
Connection
Customer Rating
Fiber
Aerux Broadband
Connection
Customer Rating
Fixed Wireless
Providers with less than 1% coverage in this city are excluded from the list. To see if one of these providers is available at your home, please use the address search above.
Speed and technology may vary by address for all providers. Please note we may have a financial relationship with some of the providers above, which does not impact the customer ratings displayed. Customer ratings listed above are national ratings, local Castle Rock ratings may vary and are shown below.
Who is the Best Internet Provider in Castle Rock, CO?
XFINITY from Comcast is the highest-rated internet provider in Castle Rock based on 151 Colorado customer reviews, and T-Mobile Home Internet has the highest rating nationwide. The provider information above and the information immediately below can help you decide. Compare provider ratings and review counts above.
Click here to get XFINITY from Comcast
or call 1-877-244-3013
Which Providers are Available at my Home in Castle Rock?
Coverage changes block by block. Pick a provider and a technology to see where its service reaches: the darker the area, the larger the share of homes it covers. For your exact address, use the address search above.
Coverage map for each provider in Castle Rock
- XFINITY - cable coverage map
- Kellin Communications - fixed wireless coverage map
- BAM Broadband - fixed wireless coverage map
- Quantum Fiber - fiber coverage map
- Xtream Internet - fixed wireless coverage map
- CenturyLink - fiber coverage map
- Verizon - fixed wireless coverage map
- CenturyLink - dsl coverage map
- Aerux Broadband - fixed wireless coverage map
- XFINITY - fiber coverage map
- T-Mobile Home Internet - fixed wireless coverage map
- AT&T - fixed wireless coverage map
- EarthLink - fixed wireless coverage map
- Visionary Broadband - fixed wireless coverage map
- Thrive Broadband - fixed wireless coverage map
- Rise Broadband - fixed wireless coverage map
How Castle Rock Compares to Places Its Size
Castle Rock's report card score is tied 601st of 749 and its connectivity index is tied 30th of 749.
| Measure | Castle Rock | Rank among US small cities (50,000 to 99,999 people) | Douglas County | Colorado | US | Leader |
|---|---|---|---|---|---|---|
| ISP Report Card inputs: what providers offer here | ||||||
| Fiber availability | 32.7% | Tied 680th of 749 | 43.5% | 63.2% | 71.5% | Aloha, OR and Shawnee, KS (100.0%) |
| Average top speed | 1,819 Mbps | 691st of 749 | 3,118 Mbps | 3,263 Mbps | 3,486 Mbps | Layton, UT (9,808 Mbps) |
| Providers at a typical address | 9.6 | Tied 47th of 749 | 7.8 | 7.3 | 7.1 | Guaynabo, PR (14.3) |
| Connectivity index inputs: how much households need and use the internet | ||||||
| People per household | 2.8 | Tied 230th of 749 | 2.8 | 2.5 | 2.7 | Pacoima, CA and Spring Valley, NY (4.3) |
| Workers who work from home | 30% | Tied 36th of 749 | 31% | 21% | 15% | Danville, CA and Potomac, MD and 2 more (39%) |
| Homes with a computer, tablet or phone | 98% | Tied 115th of 749 | 99% | 97% | 96% | Atascocita, TX and Eastvale, CA and 8 more (100%) |
| Homes with internet | 98% | Tied 5th of 749 | 98% | 94% | 91% | Centreville, VA and Danville, CA and 2 more (99%) |
| Homes on fiber, cable or DSL | 91% | Tied 10th of 749 | 90% | 81% | 76% | Flower Mound, TX and Johns Creek, GA and 1 more (93%) |
| More about the households here | ||||||
| Homes with a desktop or laptop | 95% | Tied 14th of 749 | 95% | 88% | 81% | Sammamish, WA (99%) |
| Median household income | $153,471 | 50th of 749 | $159,403 | $109,874 | $93,246 | Potomac, MD ($227,882) |
| Residents in school (6th grade to college) | 17% | Tied 214th of 749 | 16% | 16% | 16% | East Lansing, MI (58%) |
Fiber reaches 32.7% of homes in Castle Rock, against 43.5% across Douglas County and 63.2% across Colorado. Households in Castle Rock are larger than the US average (2.8 people against 2.7); 30% of workers work from home (US 15%); and the median household income is $153,471 (US $93,246).
Our demographic data is sourced from the latest 5-year release of the American Community Survey by the US Census Bureau.
Fiber, 5G, Cable and DSL Internet in Castle Rock
Which Fiber Internet Providers are Available in Castle Rock?
Quantum Fiber in Castle Rock, CO
Availability:
30.5%
Customer Rating:
(52)
Avg. Download Speed
1,985 Mbps
Quantum Fiber offers Fiber service to 30.5% of Castle Rock homes. Across the city, Quantum Fiber is the only type of service available from the company, with speeds up to 1,985 Mbps, with speeds from 940 Mpbs up to 8,000 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 940 and as high as 8,000, with an average of 1,277 Mbps throughout the city.
CenturyLink Fiber in Castle Rock, CO
Availability:
25.3%
Customer Rating:
(62)
Avg. Download Speed
942 Mbps
CenturyLink offers Fiber service to 25.3% of Castle Rock homes. Across the city, CenturyLink Fiber has speeds up to 942 Mbps, with speeds from 40 Mpbs up to 1,000 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 5.0 and as high as 1,000, with an average of 895 Mbps throughout the city. CenturyLink Fiber is rated lower than other types of internet service available in Castle Rock from CenturyLink in terms of customer satisfaction.
XFINITY Fiber in Castle Rock, CO
Availability:
3.9%
Customer Rating:
(300)
Avg. Download Speed
1,502 Mbps
XFINITY from Comcast offers Fiber service to 3.9% of Castle Rock homes. Across the city, XFINITY Fiber has speeds up to 1,502 Mbps, with speeds from 1,200 Mpbs up to 2,000 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 35 and as high as 2,000, with an average of 684 Mbps throughout the city. XFINITY Fiber is rated about the same as other types of internet service available in Castle Rock from XFINITY in terms of customer satisfaction.
Which Fixed Wireless and LTE Internet Providers are Available in Castle Rock?
Kellin Communications Fixed Wireless in Castle Rock, CO
Availability:
97.8%
Customer Rating:
(1)
Avg. Download Speed
897 Mbps
Kellin Communications offers Fixed Wireless service to 97.8% of Castle Rock homes. Across the city, Kellin Communications Fixed Wireless is the only type of service available from the company, with speeds up to 897 Mbps, with speeds from 100 Mpbs up to 1,000 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 50 and as high as 220, with an average of 201 Mbps throughout the city.
Xtream Internet Fixed Wireless in Castle Rock, CO
Availability:
96.7%
Customer Rating:
(3)
Avg. Download Speed
290 Mbps
Xtream Internet offers Fixed Wireless service to 96.7% of Castle Rock homes. Across the city, Xtream Internet Fixed Wireless is the only type of service available from the company, with speeds up to 290 Mbps, with speeds from 100 Mpbs up to 500 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 40 and as high as 100, with an average of 97 Mbps throughout the city.
T-Mobile Home Internet Fixed Wireless in Castle Rock, CO
Availability:
96.1%
Customer Rating:
(342)
Avg. Download Speed
57 Mbps
T-Mobile Home Internet offers Fixed Wireless service to 96.1% of Castle Rock homes. Across the city, T-Mobile Home Internet Fixed Wireless is the only type of service available from the company, with speeds up to 57 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 10 Mbps throughout the city.
Verizon Fixed Wireless in Castle Rock, CO
Availability:
88.8%
Customer Rating:
(362)
Avg. Download Speed
263 Mbps
Verizon offers Fixed Wireless service to 88.8% of Castle Rock homes. Across the city, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 263 Mbps, with speeds from 25 Mpbs up to 300 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 6.0 and as high as 20, with an average of 18 Mbps throughout the city.
BAM Broadband Fixed Wireless in Castle Rock, CO
Availability:
86.0%
Customer Rating:
(0)
Avg. Download Speed
1,000 Mbps
BAM Broadband offers Fixed Wireless service to 86.0% of Castle Rock homes. Across the city, BAM Broadband Fixed Wireless is the only type of service available from the company, with speeds up to 1,000 Mbps
EarthLink Fixed Wireless in Castle Rock, CO
Availability:
79.1%
Customer Rating:
(4)
Avg. Download Speed
49 Mbps
EarthLink offers Fixed Wireless service to 79.1% of Castle Rock homes. Across the city, EarthLink Fixed Wireless is the only type of service available from the company, with speeds up to 49 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 8.4 Mbps throughout the city.
AT&T Fixed Wireless in Castle Rock, CO
Availability:
79.1%
Customer Rating:
(205)
Avg. Download Speed
49 Mbps
AT&T offers Fixed Wireless service to 79.1% of Castle Rock homes. Across the city, AT&T Fixed Wireless is the only type of service available from the company, with speeds up to 49 Mbps, with speeds from 25 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 3.0 and as high as 20, with an average of 8.4 Mbps throughout the city.
Aerux Broadband Fixed Wireless in Castle Rock, CO
Availability:
59.4%
Customer Rating:
(0)
Avg. Download Speed
100 Mbps
Aerux Broadband offers Fixed Wireless service to 59.4% of Castle Rock homes. Across the city, Aerux Broadband Fixed Wireless is the only type of service available from the company, with speeds up to 100 Mbps
Thrive Broadband Fixed Wireless in Castle Rock, CO
Availability:
14.3%
Customer Rating:
(0)
Avg. Download Speed
40 Mbps
Thrive Broadband offers Fixed Wireless service to 14.3% of Castle Rock homes. Across the city, Thrive Broadband Fixed Wireless is the only type of service available from the company, with speeds up to 40 Mbps
Rise Broadband Fixed Wireless in Castle Rock, CO
Availability:
9.8%
Customer Rating:
(15)
Avg. Download Speed
35 Mbps
Rise Broadband offers Fixed Wireless service to 9.8% of Castle Rock homes. Across the city, Rise Broadband Fixed Wireless is the only type of service available from the company, with speeds up to 35 Mbps, with speeds from 25 Mpbs up to 50 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 5.0 and as high as 10, with an average of 6.9 Mbps throughout the city.
Visionary Broadband Fixed Wireless in Castle Rock, CO
Availability:
3.1%
Customer Rating:
(1)
Avg. Download Speed
200 Mbps
Visionary Broadband offers Fixed Wireless service to 3.1% of Castle Rock homes. Across the city, Visionary Broadband Fixed Wireless is the only type of service available from the company, with speeds up to 200 Mbps
Which Cable Internet Providers are Available in Castle Rock?
XFINITY Cable in Castle Rock, CO
Availability:
95.6%
Customer Rating:
(2077)
Avg. Download Speed
1,708 Mbps
XFINITY from Comcast offers Cable service to 95.6% of Castle Rock homes. Across the city, XFINITY Cable has speeds up to 1,708 Mbps, with speeds from 1,200 Mpbs up to 2,000 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 35 and as high as 250, with an average of 172 Mbps throughout the city. XFINITY Cable is rated the same as other types of internet service available in Castle Rock from XFINITY in terms of customer satisfaction.
Which DSL Internet Providers are Available in Castle Rock?
CenturyLink DSL in Castle Rock, CO
Availability:
89.4%
Customer Rating:
(120)
Avg. Download Speed
95 Mbps
CenturyLink offers DSL service to 89.4% of Castle Rock homes. Across the city, CenturyLink DSL has speeds up to 95 Mbps, with speeds from 10 Mpbs up to 140 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 100, with an average of 15 Mbps throughout the city. CenturyLink DSL is rated about the same as other types of internet service available in Castle Rock from CenturyLink in terms of customer satisfaction.
Internet in Castle Rock by Neighborhood and ZIP Code
Fiber reaches from 26.8% of homes in 80108 to 32.0% in 80109. Each row links to that place’s page.
Neighborhoods in Castle Rock
| Neighborhood | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|
ZIP codes in Castle Rock
How Castle Rock Compares to Nearby Places
The 10 places nearest to Castle Rock that have their own pages are all within 11 miles. Among them, Parker has the most homes with fiber (71.4%) and Franktown the fewest (9.0%); Castle Rock has 32.7%.
| Place | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| Castle Rock (this page) | 82,468 | 32.7% | 1,819 Mbps | 9.6 | B- | 92/100 |
| Parker | 87,082 | 71.4% | 4,960 Mbps | 8.8 | B+ | 93/100 |
| Lone Tree | 14,352 | 38.4% | 1,657 Mbps | 6.5 | C+ | 80/100 |
| The Pinery | 12,123 | 23.3% | 1,879 Mbps | 9.6 | B- | 93/100 |
| Castle Pines North | 10,964 | 13.0% | 1,555 Mbps | 9.1 | B- | 94/100 |
| Stonegate | 10,764 | 28.9% | 2,437 Mbps | 6.5 | C+ | 93/100 |
| Franktown | 4,269 | 9.0% | 1,860 Mbps | 9.4 | B- | 71/100 |
| Sedalia | 3,384 | 17.1% | 1,161 Mbps | 8.5 | C+ | 70/100 |
| Louviers | 401 | 0.0% | 1,147 Mbps | 7.2 | C | 77/100 |
| Shamballah-Ashrama | 367 | 0.0% | 960 Mbps | 7.6 | C- | 70/100 |
| Meridian | 135 | 100.0% | 2,000 Mbps | 10 | A | 63/100 |
Who is the Fastest Internet Provider in Castle Rock?
According to unbiased feedback from real internet customers, they reported being happiest with speeds provided by XFINITY from Comcast. On the other hand, based on data provided by the internet providers to the FCC, Quantum Fiber should have faster speeds at a local level. While we typically put more weight on real-world customer ratings, we display both satisfaction and technical maximum information for customers to decide for themselves.
Data Reported to FCC by ISPs: Average Maximum Available in Castle Rock
| Aerux Broadband | 10,000 |
|---|---|
| Quantum Fiber | 8,000 |
| XFINITY from Comcast | 2,000 |
| Thrive Broadband | 2,000 |
| CenturyLink | 1,000 |
| Kellin Communications | 1,000 |
| BAM Broadband | 1,000 |
| Xtream Internet | 500 |
| Verizon | 300 |
| Visionary Broadband | 200 |
| Viasat | 100 |
| T-Mobile Home Internet | 100 |
| AT&T | 100 |
| EarthLink | 100 |
| Rise Broadband | 50 |
| HughesNet | 25 |
How fast is your internet?
Test your connection here and see it next to the speeds providers advertise in Castle Rock. It takes about 20 seconds and, on a fast line, can move a few hundred MB of data.
Customer Ratings for Castle Rock Internet Providers
Based on 151 reviews from Colorado internet customers, XFINITY from Comcast is the best internet service provider for Castle Rock residents. XFINITY from Comcast was rated at an average of 3.38 out of 5 in our report for overall customer satisfaction. AT&T wins for second-place in Colorado, with 1.00 out of 5 stars and 79.1% coverage in Castle Rock.
At a national level, based on 4864 national reviews for any of the providers listed above, T-Mobile Home Internet is rated higher than any other provider, with a rating of 4.02 out of 5.
Local, State, and National Ratings for all Castle Rock Internet Providers
The table below shows average customer ratings from customers in Castle Rock, Colorado, and customers throughout the country.
| ISP / Tech Type | Castle Rock Overall | Colorado Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| XFINITY |  (2) | (114) | (2379) | View Plans | ||
| AT&T | (0) |  (1) | (1051) | View Plans | ||
| HughesNet | (0) |  (1) |  (25) | View Plans | ||
| Kellin Communications | (0) | (1) | (1) | View Plans | ||
| Quantum Fiber | (0) | (7) | (52) | View Plans | ||
| Rise Broadband | (0) | (2) | (18) | View Plans | ||
| T-Mobile Home Internet | (0) | (5) | (342) | View Plans | ||
| Verizon | (0) | (5) | (816) | View Plans | ||
| Visionary Broadband | (0) | (1) | (4) | View Plans | ||
| CenturyLink | (1) | (15) | (183) | View Plans | ||
| EarthLink | (0) | (0) | (15) | View Plans | ||
| Xtream Internet | (0) | (0) | (3) | View Plans | ||
| Viasat | (0) | (0) |  (12) | View Plans | ||
| Aerux Broadband | (0) | (0) | (0) | View Plans | ||
| Thrive Broadband | (0) | (0) | (0) | View Plans | ||
| BAM Broadband | (0) | (0) | (0) | View Plans |
Customer Ratings for Internet Provider Speeds in Castle Rock
Based on data reported by Castle Rock ISPs to the FCC, the fastest speeds in the city are available through Quantum Fiber. The company offers speeds up to 8,000 Mbps in Castle Rock. Therefore, the average customer can get up to 1,985 Mbps if they’re willing to purchase the fastest subscription tier available at their homes.
However, actual customers rated their satisfaction with internet speed highest with XFINITY from Comcast. This indicates XFINITY reliably delivers speeds expected by the customer based on the plan they are paying for.
| ISP / Tech Type | Castle Rock Speed | Colorado Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| XFINITY | (2) | (114) | (2379) | View Plans | ||
| AT&T | (0) | (1) | (1051) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Kellin Communications | (0) | (1) | (1) | View Plans | ||
| Quantum Fiber | (0) | (7) | (52) | View Plans | ||
| Rise Broadband | (0) | (2) | (18) | View Plans | ||
| T-Mobile Home Internet | (0) | (5) | (342) | View Plans | ||
| Verizon | (0) | (5) | (816) | View Plans | ||
| Visionary Broadband | (0) | (1) | (4) | View Plans | ||
| CenturyLink | (1) | (15) | (183) | View Plans | ||
| EarthLink | (0) | (0) | (15) | View Plans | ||
| Xtream Internet | (0) | (0) | (3) | View Plans | ||
| Viasat | (0) | (0) | (12) | View Plans | ||
| Aerux Broadband | (0) | (0) | (0) | View Plans | ||
| Thrive Broadband | (0) | (0) | (0) | View Plans | ||
| BAM Broadband | (0) | (0) | (0) | View Plans |
Who is the Cheapest Internet Provider in Castle Rock?
Of the providers in Castle Rock, customers rate AT&T the best for price. Data comes from customers rating their satisfaction with pricing: in Castle Rock where enough of them have reviewed a provider, otherwise across Colorado or the country. This feedback is valuable because it considers price changes and whether the speeds paid for are worth it.
AT&T is rated 1.00 out of 5 for price, which is much lower than the average across all internet providers in the country. CenturyLink is rated second for affordability, with an average price rating of 4.00 out of 5.
The table below shows how customers in Castle Rock, Colorado, and the United States rated the affordability of their internet service.
Rated Affordability in Castle Rock
| ISP / Tech Type | Castle Rock Affordability | Colorado Affordability | National Affordability | For Service | ||
|---|---|---|---|---|---|---|
| CenturyLink | (1) | (15) | (183) | View Plans | ||
| AT&T | (0) | (1) | (1051) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Kellin Communications | (0) | (1) | (1) | View Plans | ||
| Quantum Fiber | (0) | (7) | (52) | View Plans | ||
| Rise Broadband | (0) | (2) | (18) | View Plans | ||
| T-Mobile Home Internet | (0) | (5) | (342) | View Plans | ||
| Verizon | (0) | (5) | (816) | View Plans | ||
| Visionary Broadband | (0) | (1) | (4) | View Plans | ||
| XFINITY | (2) | (114) | (2379) | View Plans | ||
| Xtream Internet | (0) | (0) | (3) | View Plans | ||
| EarthLink | (0) | (0) | (15) | View Plans | ||
| Viasat | (0) | (0) | (12) | View Plans | ||
| Aerux Broadband | (0) | (0) | (0) | View Plans | ||
| Thrive Broadband | (0) | (0) | (0) | View Plans | ||
| BAM Broadband | (0) | (0) | (0) | View Plans |
Customer Reviews for Internet Service Providers in Colorado
Customer Reviews
A Castle Rock, CO Customer
XFINITY Fiber
August 04, 2025 Mary T.
CenturyLink DSL
May 14, 2024 I am currently with Century Link. I think the service is ok. The speed is a little slow and has interruptions frequently. This mainly happens if I am streaming music on my TV or trying to use my printer. I find the price is good compared to other options.
A Castle Rock, CO Customer
XFINITY Cable
February 07, 2023 Support is Ok, but I feel like I know more about how to fix a problem than they do. I also have intermittent drops which is really frustrating and I think it is my modem but they have not really solved anything,. I find the pricing to be pretty good...my speed just got bumped up as well so I really cannot complain.
ISPReports User
Ciello Fiber
November 08, 2026 very bad, very slow. usually ok. No devices but mine. a computer hooked up directly and my phone on wireless.
Troy Kelly
Visionary Broadband Fiber
October 29, 2026 567.8 kbps download speed from lan connection on router . This is fiber optic ? 1220 hills cir pagosa springs Co 81147 is our address and we would like the service you sold us . This download speed is terrible.
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Which ISP Should You Choose in Castle Rock?
The right ISP for you depends upon your needs, but in general we can make the following suggestions:
- The best all-around internet service provider in Castle Rock is XFINITY.
- The fastest internet provider should be Quantum Fiber. Considering speed for the money and reliability in speeds, XFINITY from Comcast may be a better choice based on real-world local customer feedback.
- The most affordable internet provider in Castle Rock is AT&T.
- Viasat, HughesNet, and CenturyLink has the broadest coverage in Castle Rock, available to 98.1% of homes, and is most likely to cover your home. To find out exactly what’s available at your home, please use our address search tool.