Best Internet Providers in Castaic, CA
All 5 providers, ranked by coverage, speed and customer ratings
Find internet availability by address in Castaic, CA
Castaic has 5 internet service providers, they are sorted by coverage, available speed, and customer rating from our unbiased internet provider report. Fiber, Cable, DSL, and Fixed Wireless 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 Castaic.
Ranks compare Castaic with the 1,383 US suburban and regional cities (25,000 to 49,999 people), the tiers of our fastest-cities rankings.
The Best Internet in Castaic, CA at a Glance
Castaic Internet Providers, Ranked by Coverage, Speed and Customer Ratings
Spectrum
Connection
Customer Rating
Fiber
Cable
EarthLink
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
AT&T
Connection
Customer Rating
Fiber
DSL
Fixed Wireless
T-Mobile Home Internet
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 Castaic ratings may vary and are shown below.
Who is the Best Internet Provider in Castaic, CA?
T-Mobile Home Internet is the best internet provider in Castaic based on California customer satisfaction ratings and reviews. Based on our extensive and unbiased survey, T-Mobile Home Internet had the best reviews at the local, state, and national levels versus all available providers in Castaic, making it a solid recommendation among providers with reviews. T-Mobile Home Internet is an option for 71.30% of the city.
Click here to get T-Mobile Home Internet
or call 1-833-601-2935
Which Providers are Available at my Home in Castaic?
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 Castaic
- Spectrum - cable coverage map
- AT&T - fiber coverage map
- EarthLink - fiber coverage map
- Verizon - fixed wireless coverage map
- Spectrum - fiber coverage map
- AT&T - dsl coverage map
- EarthLink - dsl coverage map
- T-Mobile Home Internet - fixed wireless coverage map
- AT&T - fixed wireless coverage map
- EarthLink - fixed wireless coverage map
How Castaic Compares to Places Its Size
Castaic's report card score is in the bottom 4% and its connectivity index is in the top 7%.
| Measure | Castaic | Rank among US suburban and regional cities (25,000 to 49,999 people) | Los Angeles County | California | US | Leader |
|---|---|---|---|---|---|---|
| ISP Report Card inputs: what providers offer here | ||||||
| Fiber availability | 16.6% | bottom 6% | 75.3% | 62.4% | 71.5% | 25 places at 100.0% |
| Average top speed | 1,559 Mbps | bottom 11% | 4,064 Mbps | 3,834 Mbps | 3,486 Mbps | Hixson, TN (25,000 Mbps) |
| Providers at a typical address | 5.4 | bottom 12% | 7.7 | 8 | 7.1 | San Lorenzo, CA (13) |
| Connectivity index inputs: how much households need and use the internet | ||||||
| People per household | 3.2 | top 8% | 3.0 | 3.0 | 2.7 | Kiryas Joel, NY (5.1) |
| Workers who work from home | 15% | top 42% | 17% | 17% | 15% | Venice, CA (47%) |
| Homes with a computer, tablet or phone | 100% | top 1% | 97% | 97% | 96% | Tied with 15 other places at 100% |
| Homes with internet | 97% | top 5% | 93% | 94% | 91% | 13 places at 99% |
| Homes on fiber, cable or DSL | 83% | top 33% | 78% | 79% | 76% | Burke, VA and Colleyville, TX and 3 more (94%) |
| More about the households here | ||||||
| Homes with a desktop or laptop | 92% | top 12% | 82% | 84% | 81% | University Park, TX (99%) |
| Median household income | $140,870 | top 14% | $100,015 | $111,728 | $93,246 | Scarsdale, NY ($244,191) |
| Residents in school (6th grade to college) | 17% | top 22% | 17% | 17% | 16% | Rexburg, ID (71%) |
Fiber reaches 16.6% of homes in Castaic, against 75.3% across Los Angeles County and 62.4% across California. Households in Castaic are larger than the US average (3.2 people against 2.7); 15% of workers work from home (US 15%); and the median household income is $140,870 (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 Castaic
Which Fiber Internet Providers are Available in Castaic?
EarthLink Fiber in Castaic, CA
Availability:
11.7%
Customer Rating:
(6)
Avg. Download Speed
4,918 Mbps
EarthLink offers Fiber service to 11.7% of Castaic homes. Across the city, EarthLink Fiber has speeds up to 4,918 Mbps, with speeds from 1,000 Mpbs up to 5,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for EarthLink Fiber. EarthLink Fiber is rated about the same as other types of internet service available in Castaic from EarthLink in terms of customer satisfaction.
AT&T Fiber in Castaic, CA
Availability:
11.7%
Customer Rating:
(542)
Avg. Download Speed
4,918 Mbps
AT&T offers Fiber service to 11.7% of Castaic homes. Across the city, AT&T Fiber has speeds up to 4,918 Mbps, with speeds from 1,000 Mpbs up to 5,000 Mbps depending on the address. Upload speeds are symmetrical, meaning they are exactly the same as download speeds for AT&T Fiber. AT&T Fiber is rated lower than other types of internet service available in Castaic from AT&T in terms of customer satisfaction.
Spectrum Fiber in Castaic, CA
Availability:
8.6%
Customer Rating:
(207)
Avg. Download Speed
1,000 Mbps
Spectrum offers Fiber service to 8.6% of Castaic homes. Across the city, Spectrum Fiber has speeds up to 1,000 Mbps
Which Fixed Wireless and LTE Internet Providers are Available in Castaic?
T-Mobile Home Internet Fixed Wireless in Castaic, CA
Availability:
71.3%
Customer Rating:
(342)
Avg. Download Speed
25 Mbps
T-Mobile Home Internet offers Fixed Wireless service to 71.3% of Castaic homes. Across the city, T-Mobile Home Internet Fixed Wireless is the only type of service available from the company, with speeds up to 25 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 3.0 Mbps throughout the city.
Verizon Fixed Wireless in Castaic, CA
Availability:
48.7%
Customer Rating:
(362)
Avg. Download Speed
237 Mbps
Verizon offers Fixed Wireless service to 48.7% of Castaic homes. Across the city, Verizon Fixed Wireless is the only type of service available from the company, with speeds up to 237 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 17 Mbps throughout the city.
EarthLink Fixed Wireless in Castaic, CA
Availability:
23.3%
Customer Rating:
(4)
Avg. Download Speed
34 Mbps
EarthLink offers Fixed Wireless service to 23.3% of Castaic homes. Across the city, EarthLink Fixed Wireless has speeds up to 34 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 5.1 Mbps throughout the city.
AT&T Fixed Wireless in Castaic, CA
Availability:
23.3%
Customer Rating:
(205)
Avg. Download Speed
34 Mbps
AT&T offers Fixed Wireless service to 23.3% of Castaic homes. Across the city, AT&T Fixed Wireless has speeds up to 34 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 5.1 Mbps throughout the city.
Which Cable Internet Providers are Available in Castaic?
Spectrum Cable in Castaic, CA
Availability:
74.2%
Customer Rating:
(1739)
Avg. Download Speed
1,000 Mbps
Spectrum offers Cable service to 74.2% of Castaic homes. Across the city, Spectrum Cable has speeds up to 1,000 Mbps
Which DSL Internet Providers are Available in Castaic?
EarthLink DSL in Castaic, CA
Availability:
73.6%
Customer Rating:
(5)
Avg. Download Speed
88 Mbps
EarthLink offers DSL service to 73.6% of Castaic homes. Across the city, EarthLink DSL has speeds up to 88 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 18 Mbps throughout the city. EarthLink DSL is rated higher than other types of internet service available in Castaic from EarthLink in terms of customer satisfaction.
AT&T DSL in Castaic, CA
Availability:
73.6%
Customer Rating:
(304)
Avg. Download Speed
88 Mbps
AT&T offers DSL service to 73.6% of Castaic homes. Across the city, AT&T DSL has speeds up to 88 Mbps, with speeds from 10 Mpbs up to 100 Mbps depending on the address. Upload speeds differ from download speeds, and are as low 1.0 and as high as 20, with an average of 18 Mbps throughout the city. AT&T DSL is rated about the same as other types of internet service available in Castaic from AT&T in terms of customer satisfaction.
Internet in Castaic by Neighborhood and ZIP Code
Castaic has 1 ZIP code with its own page. Each row links to that place’s page.
Neighborhoods in Castaic
| Neighborhood | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|
ZIP codes in Castaic
| ZIP code | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| 91384 | 28,860 | 16.9% | 1,583 Mbps | 5.4 | C | 91/100 |
How Castaic Compares to Nearby Places
The 10 places nearest to Castaic that have their own pages are all within 16 miles. Among them, Granada Hills has the most homes with fiber (84.1%) and Valencia the fewest (20.9%); Castaic has 16.6%.
| Place | People | Homes with fiber | Average top speed | Providers at a typical address | Report card | Connectivity |
|---|---|---|---|---|---|---|
| Castaic (this page) | 28,753 | 16.6% | 1,559 Mbps | 5.4 | C | 90/100 |
| Simi Valley | 129,012 | 73.9% | 3,849 Mbps | 8.1 | B+ | 86/100 |
| Canyon Country | 93,696 | 25.1% | 1,620 Mbps | 6.5 | C+ | 88/100 |
| Santa Clarita | 82,664 | 37.9% | 2,192 Mbps | 6.7 | B- | 93/100 |
| Granada Hills | 49,547 | 84.1% | 5,961 Mbps | 6 | B | 86/100 |
| Chatsworth | 43,632 | 27.2% | 1,445 Mbps | 7.3 | C+ | 84/100 |
| Newhall | 35,614 | 26.0% | 1,198 Mbps | 7 | C+ | 88/100 |
| Valencia | 26,761 | 20.9% | 1,230 Mbps | 6.8 | C+ | 83/100 |
| Stevenson Ranch | 20,529 | 50.6% | 2,135 Mbps | 7.1 | B- | 95/100 |
| Piru | 568 | 0.0% | 955 Mbps | 6.7 | C- | 76/100 |
| Buckhorn | 125 | 0.0% | 813 Mbps | 4.3 | D | 72/100 |
Who is the Fastest Internet Provider in Castaic?
According to unbiased feedback from real internet customers, they reported being happiest with speeds provided by T-Mobile Home Internet. On the other hand, based on data provided by the internet providers to the FCC, Spectrum 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 Castaic
| AT&T | 5,000 |
|---|---|
| EarthLink | 5,000 |
| Spectrum | 1,000 |
| Verizon | 300 |
| Viasat | 100 |
| T-Mobile Home Internet | 100 |
| HughesNet | 25 |
How fast is your internet?
Test your connection here and see it next to the speeds providers advertise in Castaic. It takes about 20 seconds and, on a fast line, can move a few hundred MB of data.
Customer Ratings for Castaic Internet Providers
Based on 404 reviews from California internet customers, T-Mobile Home Internet is the best internet service provider for Castaic residents. T-Mobile Home Internet was rated at an average of 4.11 out of 5 in our report for overall customer satisfaction. Verizon wins for second-place in California, with 3.61 out of 5 stars and 48.7% coverage in Castaic.
At a national level, based on 4173 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 Castaic Internet Providers
The table below shows average customer ratings from customers in Castaic, California, and customers throughout the country.
| ISP / Tech Type | Castaic Overall | California Overall | National Overall | For Service | ||
|---|---|---|---|---|---|---|
| T-Mobile Home Internet |  (0) | (27) | (342) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| HughesNet | (0) | (1) |  (25) | View Plans | ||
| Viasat | (0) | (1) |  (12) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| AT&T |  (1) | (119) | (1051) | View Plans | ||
| Spectrum | (0) | (228) | (1949) | View Plans |
Customer Ratings for Internet Provider Speeds in Castaic
Based on data reported by Castaic ISPs to the FCC, the fastest speeds in the city are available through Spectrum. The company offers speeds up to 1,000 Mbps in Castaic. Therefore, the average customer can get up to 1,000 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 T-Mobile Home Internet. This indicates T-Mobile Home Internet reliably delivers speeds expected by the customer based on the plan they are paying for.
| ISP / Tech Type | Castaic Speed | California Speed | National Speed | For Service | ||
|---|---|---|---|---|---|---|
| T-Mobile Home Internet | (0) | (27) | (342) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| Spectrum | (0) | (228) | (1949) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Viasat | (0) |  (1) | (12) | View Plans | ||
| AT&T | (1) | (119) | (1051) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans |
Who is the Cheapest Internet Provider in Castaic?
Of the providers in Castaic, customers rate T-Mobile Home Internet the best for price. Data comes from customers rating their satisfaction with pricing: in Castaic where enough of them have reviewed a provider, otherwise across California or the country. This feedback is valuable because it considers price changes and whether the speeds paid for are worth it.
T-Mobile Home Internet is rated 4.26 out of 5 for price, which is higher than the average across all internet providers in the country. Verizon is rated second for affordability, with an average price rating of 3.75 out of 5.
The table below shows how customers in Castaic, California, and the United States rated the affordability of their internet service.
Rated Affordability in Castaic
| ISP / Tech Type | Castaic Affordability | California Affordability | National Affordability | For Service | ||
|---|---|---|---|---|---|---|
| T-Mobile Home Internet | (0) |  (27) | (342) | View Plans | ||
| Verizon | (0) | (28) | (816) | View Plans | ||
| HughesNet | (0) | (1) | (25) | View Plans | ||
| Viasat | (0) | (1) | (12) | View Plans | ||
| EarthLink | (0) | (2) | (15) | View Plans | ||
| AT&T | (1) | (119) | (1051) | View Plans | ||
| Spectrum | (0) | (228) | (1949) | View Plans |
Customer Reviews for Internet Service Providers in California
Customer Reviews
Steve
ting Fiber
November 13, 2026 Slow, 1/10th the speed they advertised
Robert
Verizon Fixed Wireless
November 10, 2026 Was cut off with .out notice due to upgrade and was not provided connection to upgrade from the same location (tower). Causing further problems in service and added cost.
ISPReports User
AT&T DSL
November 08, 2026 Lousy
ISPReports User
Fidium
November 08, 2026 Vernice
Frontier Fiber
November 01, 2026 Horrible this is horrible. My internet has been down for two days in a half. Never again
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Which ISP Should You Choose in Castaic?
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 Castaic is T-Mobile Home Internet.
- The fastest internet provider should be Spectrum. Considering speed for the money and reliability in speeds, T-Mobile Home Internet may be a better choice based on real-world local customer feedback.
- The most affordable internet provider in Castaic is T-Mobile Home Internet.
- Viasat, HughesNet, EarthLink, and AT&T has the broadest coverage in Castaic, available to 75.3% 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.