In New Castle there is 1 residential DSL provider covering 74.50% of the city. The average home can get speeds up to 28 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 New Castle, NH.
To see availability maps for all providers including fiber, cable, DSL, and more in New Castle, NH please click below.
New Castle, NH Availability Maps
DSL Internet Service Provider in New Castle
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 New Castle are not shown.
New Castle 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 New Castle is DSL internet available?
DSL Internet Availability Key
DSL is available in 74.50% of New Castle. Areas in green have DSL internet service, where areas in yellow or red may not. The most widely available provider is Fidium. Call one of the companies with service in New Castle above to see who has service at your home.
How fast is DSL internet in New Castle?
The map below shows maximum DSL internet speeds by area in New Castle.
DSL Internet Speed Key
The average New Castle home can get up to 28 Mbps on their DSL internet plan. The fastest DSL download speed in the city is 80 Mbps, which 19.00% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 55.50% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in New Castle.
DSL internet speeds tend to be faster in the south parts of New Castle, and slower in the west areas of the city.
Is DSL the fastest internet I can get in New Castle?
The fastest internet for you may vary based on where in New Castle you live. In general, cable competes most often with DSL in the city.
- Fiber is the fastest internet type for 49.90% of New Castle homes.
- Cable is fastest for 50.10% of the city.
- DSL is fastest for less than 1%.
- Fixed wireless is fastest for less than 1%.
- Satellite internet may be the only option for less than 1% of New Castle homes.
DSL Providers in Depth
Below you'll find which TV and internet providers offer service in New Castle, along with details on where in New Castle and at what speeds.
Fidium Fiber DSL in New Castle, NH
Fidium DSL coverage
About 74.50%, or 745 people, have Fidium DSL internet available to them in the city. The company covers the west, south, north, and northwest New Castle area. Fidium is one of the largest internet service providers internet service providers in the US, with internet service available in much of New Castle.
Fidium Fiber DSL download speeds
Fidium is below average when comparing download speeds to all other internet providers in New Castle. Versus other DSL providers in the area, Fidium DSL is the fastest. There are 2 different maximum speeds throughout New Castle. The fastest plan anyone in New Castle can order from Fidium goes up to 80 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for New Castle customers is up to 28 Mbps.
Show all download speeds
- 25.5% up to 80.0 Mbps
- 74.5% up to 10.0 Mbps
Fidium Fiber DSL upload speeds
In New Castle download speeds tend to be faster than than upload speeds for Fidium DSL. Compared to other ISPs, Fidium is below average where upload speeds are concerned, and the fastest compared to other New Castle DSL providers. Fidium offers 2 different upload speeds across the city, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in New Castle is up to 20 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, Fidium customers can get speeds up to 5.8 Mbps.
Show all upload speeds
- 25.5% up to 20.0 Mbps
- 74.5% up to 1.0 Mbps
New Castle DSL by Area
This information is most helpful to those looking for homes or considering moving to New Castle or any of the areas nearby.
How does DSL internet in New Castle compare to the rest of New Hampshire?
DSL internet speeds in New Castle are much faster versus the average speeds in New Hampshire: 0.00 Mbps in New Hampshire versus 28 Mbps in the city. The state has similar DSL availability compared to the city. Average DSL coverage in New Hampshire is 0.00% versus 74.50% in New Castle.
What zip codes have DSL internet?
DSL internet coverage varies by zip code and neighborhood. Some examples in or around New Castle 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
- Kittery, ME: less DSL coverage, slower speeds
- Kittery Point, ME: less DSL coverage, slower speeds
- Portsmouth, NH: less DSL coverage, slower speeds
- Rye, NH: less DSL coverage, slower speeds
- Eliot, ME: less DSL coverage, slower speeds
- York, ME: less DSL coverage, slower speeds
- West Rye, NH: less DSL coverage, slower speeds
- Rye Beach, NH: more DSL coverage, slower speeds
- Greenland, NH: less DSL coverage, faster speeds
- Newington, NH: less DSL coverage, slower speeds
Cities with Similar Populations
- Wausa, NE: less DSL coverage, slower speeds
- Brownlow, WV: more DSL coverage, faster speeds
- Cades, SC: less DSL coverage, faster speeds
- Campton, GA: more DSL coverage, faster speeds
- Clarkson, NE: more DSL coverage, faster speeds
- Cokesbury, NC: more DSL coverage, faster speeds
- Crabtree, OR: more DSL coverage, faster speeds
- Vulcan, MI: less DSL coverage, slower speeds
- Wakarusa, KS: less DSL coverage, faster speeds
- Amherstdale, WV: more DSL coverage, faster speeds