In Castalia there are 3 residential DSL providers covering 73.12% of the city. The average home can get speeds up to 19 Mbps. Note that we may have a financial relationship with some of the providers below. This does not influence rankings, and helps us provide high-quality detailed information for free.
This page contains all DSL internet providers in Castalia, OH.
To see availability maps for all providers including fiber, cable, DSL, and more in Castalia, OH please click below.
Castalia, OH Availability Maps
DSL Internet Service Providers in Castalia
Data updated 11/14/2025, based on FCC data from 12/31/2024. This is the most current data available as of .
To avoid wasting your time, providers with less than 1% coverage in Castalia are not shown.
Castalia Satellite TV & Internet Providers
DISH Satellite TV
DIRECTV Satellite TV
Not sure whether to choose Dish or DIRECTV? For most people most of the time we recommend DISH. But click here to learn more.
Viasat Satellite Internet
Where in Castalia is DSL internet available?
DSL Internet Availability Key
DSL is available in 73.12% of Castalia. Areas in green have DSL internet service, where areas in yellow or red may not. The most widely available provider is Amplex Internet. Call one of the companies with service in Castalia above to see who has service at your home.
How fast is DSL internet in Castalia?
The map below shows maximum DSL internet speeds by area in Castalia.
DSL Internet Speed Key
The average Castalia home can get up to 19 Mbps on their DSL internet plan. The fastest DSL download speed in the city is 100 Mbps, which 7.57% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 65.55% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in Castalia.
DSL internet speeds tend to be faster in the central parts of Castalia, and slower in the north areas of the city.
Is DSL the fastest internet I can get in Castalia?
The fastest internet for you may vary based on where in Castalia you live. In general, fiber competes most often with DSL in the city.
- Fiber is the fastest internet type for 97.42% of Castalia homes.
- Cable is fastest for 1.06% of the city.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for 1.35%.
- Satellite internet may be the only option for less than 1% of Castalia homes.
DSL Providers in Depth
Below you'll find which TV and internet providers offer service in Castalia, along with details on where in Castalia and at what speeds.
EarthLink DSL in Castalia, OH
EarthLink DSL coverage
About 73.12%, or 2,551 people, have EarthLink DSL internet available to them in the city. The company covers the entire Castalia area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in much of Castalia.
EarthLink DSL download speeds
EarthLink is one of the slowest when comparing download speeds to all other internet providers in Castalia. Versus other DSL providers in the area, EarthLink DSL is one of the slowest. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from EarthLink goes up to 10 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 10.0 Mbps
EarthLink DSL upload speeds
In Castalia download speeds tend to be faster than than upload speeds for EarthLink DSL. Compared to other ISPs, EarthLink is one of the slowest where upload speeds are concerned, and one of the slowest compared to other Castalia DSL providers. EarthLink offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 1.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1.0 Mbps
AT&T DSL in Castalia, OH
AT&T DSL coverage
About 73.12%, or 2,551 people, have AT&T DSL internet available to them in the city. The company covers the entire Castalia area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in much of Castalia.
AT&T DSL download speeds
AT&T is one of the slowest when comparing download speeds to all other internet providers in Castalia. Versus other DSL providers in the area, AT&T DSL is one of the slowest. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from AT&T goes up to 10 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 10.0 Mbps
AT&T DSL upload speeds
In Castalia download speeds tend to be faster than than upload speeds for AT&T DSL. Compared to other ISPs, AT&T is one of the slowest where upload speeds are concerned, and one of the slowest compared to other Castalia DSL providers. AT&T offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 1.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1.0 Mbps
Amplex Internet DSL in Castalia, OH
Amplex Internet DSL coverage
About 7.57%, or 264 people, have Amplex Internet DSL internet available to them in the city. The company covers the central Castalia area. Amplex Internet is a large internet service provider internet service providers in the US, with internet service available in a very small piece of Castalia.
Amplex Internet DSL download speeds
Amplex Internet is below average when comparing download speeds to all other internet providers in Castalia. Versus other DSL providers in the area, Amplex Internet DSL is the fastest. There are no different maximum speeds throughout Castalia. The fastest plan anyone in Castalia can order from Amplex Internet goes up to 100 Mbps, and all Castalia customers can get this speed.
Show all download speeds
- 100.0% up to 100.0 Mbps
Amplex Internet DSL upload speeds
In Castalia download speeds tend to be equal to than upload speeds for Amplex Internet DSL. Compared to other ISPs, Amplex Internet is below average where upload speeds are concerned, and the fastest compared to other Castalia DSL providers. Amplex Internet offers no different upload speeds across the city. The fastest upload speed available to anyone from this ISP in Castalia is up to 100 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 100.0 Mbps
Castalia DSL by Area
This information is most helpful to those looking for homes or considering moving to Castalia or any of the areas nearby.
How does DSL internet in Castalia compare to the rest of Ohio?
DSL internet speeds in Castalia are much faster versus the average speeds in Ohio: 0.00 Mbps in Ohio versus 19 Mbps in the city. The state has similar DSL availability compared to the city. Average DSL coverage in Ohio is 0.00% versus 73.12% in Castalia.
What zip codes have DSL internet?
DSL internet coverage varies by zip code and neighborhood. Some examples in or around Castalia are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does DSL internet look like in other cities?
Below are cities nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Cities
- Venice, OH: less DSL coverage, slower speeds
- Springbrook, OH: less DSL coverage, slower speeds
- Parkertown, OH: less DSL coverage, slower speeds
- Bloomingville, OH: less DSL coverage, slower speeds
- Vickery, OH: less DSL coverage, slower speeds
- Sandusky, OH: more DSL coverage, faster speeds
- North Monroeville, OH: less DSL coverage, slower speeds
- Bellevue, OH: less DSL coverage, faster speeds
- Bogart, OH: less DSL coverage, faster speeds
- Lakeside-Marblehead, OH: less DSL coverage, slower speeds
Cities with Similar Populations
- Providence, KY: more DSL coverage, slower speeds
- Elsie, MI: more DSL coverage, faster speeds
- Newbury, OH: more DSL coverage, faster speeds
- Kiefer, OK: more DSL coverage, faster speeds
- Moreland Hills, OH: more DSL coverage, faster speeds
- West Blocton, AL: more DSL coverage, faster speeds
- Plum Grove, TX: less DSL coverage, faster speeds
- Osakis, MN: more DSL coverage, faster speeds
- Niagara, WI: more DSL coverage, faster speeds
- Mayer, MN: more DSL coverage, faster speeds