Internet providers in Castaic, CA

Castaic is a census-designated place (an unincorporated community) in California with about 18,479 residents and roughly 6,218 residential locations that internet providers can report on. The table below compares the providers that report service here.

Compare internet providers in Castaic, CA

Share of residential locations in Castaic 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	Spectrum	Fiber, Cable	98%
2	AT&T	Fiber, DSL, Fixed wireless	84%	Check availability
3	T-Mobile Home Internet	Fixed wireless	77%
4	Verizon	Fiber, Fixed wireless	15%	Check availability

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 Castaic

Spectrum reports service to the most residential locations in Castaic, about 98%. 3 providers report coverage of at least half of locations (Spectrum, AT&T, and T-Mobile Home Internet), so the market looks competitive. T-Mobile Home Internet offers fixed wireless home internet, an option if you prefer no cable or fiber installation.

What technologies are available in Castaic?

10%

of locations can get fiber

98%

can get cable

73%

can get DSL

50%

can get fixed wireless

99%+

can get 100+ Mbps

16%

can get gigabit

Fiber is limited in Castaic, reaching about 10% of locations. Plans of 100 Mbps or faster are reported for about 99%+ of locations, while gigabit-class service reaches about 16%. DSL is still reported for about 73% of locations, which can be a fallback where fiber and cable do not reach. Fixed wireless home internet is reported for about 50% of locations.

FCC National Broadband Map, data as of December 31, 2025: share of residential locations in Castaic that providers report they can serve. City-level figures, not your address.

Castaic at a glance

18,479residents

5,816households

$132,153median household income

97%households with broadband

2%have no internet

37median age

About 97% of households in Castaic have a broadband subscription, 4 points above the California average of 92%.

Source: U.S. Census Bureau, American Community Survey 5-year estimates (2023).

Internet providers in places near Castaic

Frequently asked questions

Is fiber internet available in Castaic?

Yes, in part. About 10% of residential locations in Castaic can get fiber, 98% can get cable, and about 16% can get gigabit-class speeds, per FCC data. Availability depends on your exact address.

Which internet provider has the widest coverage in Castaic?

Spectrum reports service to about 98% of residential locations in Castaic, the most of any provider, per FCC data. Availability still depends on your address.

How many internet providers serve Castaic?

4 providers report service to at least 2% of locations in Castaic, and 3 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 Castaic?

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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