In Portsmouth there is 1 residential DSL provider covering 57.69% of the city. The average home can get speeds up to 25 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 Portsmouth, NH.
To see availability maps for all providers including fiber, cable, DSL, and more in Portsmouth, NH please click below.
Portsmouth, NH Availability Maps
DSL Internet Service Provider in Portsmouth
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 Portsmouth are not shown.
Portsmouth 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 Portsmouth is DSL internet available?
DSL Internet Availability Key
DSL is available in 57.69% of Portsmouth. 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 Portsmouth above to see who has service at your home.
How fast is DSL internet in Portsmouth?
The map below shows maximum DSL internet speeds by area in Portsmouth.
DSL Internet Speed Key
The average Portsmouth home can get up to 25 Mbps on their DSL internet plan. The fastest DSL download speed in the city is 100 Mbps, which 1.31% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, 44.93% of homes can only purchase plans up to 10 Mbps. See the internet provider details below for info about their speed and coverage in Portsmouth.
DSL internet speeds tend to be faster in the south parts of Portsmouth, and slower in the southeast areas of the city.
Is DSL the fastest internet I can get in Portsmouth?
The fastest internet for you may vary based on where in Portsmouth you live. In general, cable competes most often with DSL in the city.
- Fiber is the fastest internet type for 36.52% of Portsmouth homes.
- Cable is fastest for 63.45% 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 Portsmouth homes.
DSL Providers in Depth
Below you'll find which TV and internet providers offer service in Portsmouth, along with details on where in Portsmouth and at what speeds.
Fidium Fiber DSL in Portsmouth, NH
Fidium DSL coverage
About 57.69%, or 13,059 people, have Fidium DSL internet available to them in the city. The company covers the entire Portsmouth area. Fidium is one of the largest internet service providers internet service providers in the US, with internet service available in a majority of Portsmouth.
Fidium Fiber DSL download speeds
Fidium is below average when comparing download speeds to all other internet providers in Portsmouth. Versus other DSL providers in the area, Fidium DSL is the fastest. There are 4 different maximum speeds throughout Portsmouth. The fastest plan anyone in Portsmouth can order from Fidium goes up to 100 Mbps, the slowest package only goes up to 10 Mbps, and the city-wide average maximum speed for Portsmouth customers is up to 25 Mbps.
Show all download speeds
- 2.3% up to 100.0 Mbps
- 16.4% up to 80.0 Mbps
- 3.4% up to 60.0 Mbps
- 77.9% up to 10.0 Mbps
Fidium Fiber DSL upload speeds
In Portsmouth 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 Portsmouth DSL providers. Fidium offers 4 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 Portsmouth is up to 40 Mbps. Some customers have slower plan choices, which only go up to 1.0 Mbps. On average, Fidium customers can get speeds up to 5.3 Mbps.
Show all upload speeds
- 2.3% up to 40.0 Mbps
- 16.4% up to 20.0 Mbps
- 3.4% up to 10.0 Mbps
- 77.9% up to 1.0 Mbps
Portsmouth DSL by Area
This information is most helpful to those looking for homes or considering moving to Portsmouth or any of the areas nearby.
How does DSL internet in Portsmouth compare to the rest of New Hampshire?
DSL internet speeds in Portsmouth are much faster versus the average speeds in New Hampshire: 0.00 Mbps in New Hampshire versus 25 Mbps in the city. The state has similar DSL availability compared to the city. Average DSL coverage in New Hampshire is 0.00% versus 57.69% in Portsmouth.
What zip codes have DSL internet?
DSL internet coverage varies by zip code and neighborhood. Some examples in or around Portsmouth 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
- New Castle, NH: more DSL coverage, faster speeds
- Kittery, ME: less DSL coverage, slower speeds
- Rye, NH: less DSL coverage, slower speeds
- Greenland, NH: more DSL coverage, faster speeds
- Kittery Point, ME: less DSL coverage, faster speeds
- Newington, NH: less DSL coverage, slower speeds
- West Rye, NH: less DSL coverage, slower speeds
- Eliot, ME: more DSL coverage, slower speeds
- Rye Beach, NH: more DSL coverage, slower speeds
- North Hampton, NH: less DSL coverage, slower speeds
Cities with Similar Populations
- Fallon, NV: less DSL coverage, slower speeds
- Fayetteville, TN: more DSL coverage, faster speeds
- Fernley, NV: less DSL coverage, slower speeds
- Forest, VA: less DSL coverage, slower speeds
- South San Jose Hills, CA: less DSL coverage, slower speeds
- Stanwood, WA: more DSL coverage, faster speeds
- Stony Brook, NY: less DSL coverage, slower speeds
- Evans, CO: more DSL coverage, faster speeds
- Sunland, CA: less DSL coverage, faster speeds
- Sunny Isles Beach, FL: more DSL coverage, faster speeds