In 21904 there is 1 residential DSL provider covering 26.39% of the zip. The average home can get speeds up to 10 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 21904, MD.
To see availability maps for all providers including fiber, cable, DSL, and more in 21904, MD please click below.
DSL Internet Service Provider in 21904
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 21904 are not shown.
21904 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 21904 is DSL internet available?
DSL Internet Availability Key
DSL is available in 26.39% of 21904. Areas in green have DSL internet service, where areas in yellow or red may not. The most widely available provider is Armstrong. Call one of the companies with service in 21904 above to see who has service at your home.
How fast is DSL internet in 21904?
The map below shows maximum DSL internet speeds by area in 21904.
DSL Internet Speed Key
The average 21904 home can get up to 10 Mbps on their DSL internet plan. The fastest DSL download speed in the zip is 10 Mbps, which 26.39% of residents can get.
Is DSL the fastest internet I can get in 21904?
The fastest internet for you may vary based on where in 21904 you live. In general, cable competes most often with DSL in the zip.
- Fiber is the fastest internet type for 28.52% of 21904 homes.
- Cable is fastest for 69.62% of the zip.
- 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 21904 homes.
DSL Providers in Depth
Below you'll find which TV and internet providers offer service in 21904, along with details on where in 21904 and at what speeds.
Armstrong DSL in 21904, MD
Armstrong DSL coverage
About 26.39%, or 1,773 people, have Armstrong DSL internet available to them in the zip. The company covers the northeast, north, and northwest 21904 area. Armstrong is a large internet service provider internet service providers in the US, with internet service available in a small portion of 21904.
Armstrong DSL download speeds
Armstrong is the slowest when comparing download speeds to all other internet providers in 21904. Versus other DSL providers in the area, Armstrong DSL is the fastest. There are no different maximum speeds throughout 21904. The fastest plan anyone in 21904 can order from Armstrong goes up to 10 Mbps, and all 21904 customers can get this speed.
Show all download speeds
- 100.0% up to 10.0 Mbps
Armstrong DSL upload speeds
In 21904 download speeds tend to be faster than than upload speeds for Armstrong DSL. Compared to other ISPs, Armstrong is the slowest where upload speeds are concerned, and the fastest compared to other 21904 DSL providers. Armstrong offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 21904 is up to 1.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 1.0 Mbps
21904 DSL by Area
This information is most helpful to those looking for homes or considering moving to 21904 or any of the areas nearby.
How does DSL internet in 21904 compare to the rest of Maryland?
DSL internet speeds in 21904 are much faster versus the average speeds in Maryland: 0.00 Mbps in Maryland versus 10 Mbps in the zip. The state has similar DSL availability compared to the zip. Average DSL coverage in Maryland is 0.00% versus 26.39% in 21904.
What zip codes have DSL internet?
DSL internet coverage varies by zip code and neighborhood. Some examples in or around 21904 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 zip codes?
Below are zip codes nearby and with similar populations. This comparison can be useful if living somewhere with fast internet is important to you.
Nearby Zip Codes
- 21917, MD: more DSL coverage, similar speeds
- 21911, MD: more DSL coverage, similar speeds
- 21918, MD: more DSL coverage, similar speeds
- 21901, MD: less DSL coverage, similar speeds
- 19362, PA: more DSL coverage, faster speeds
- 17563, PA: more DSL coverage, faster speeds
- 19363, PA: less DSL coverage, faster speeds
- 19352, PA: less DSL coverage, similar speeds
- 21903: less DSL coverage, slower speeds
- 21902: less DSL coverage, slower speeds
Zip Codes with Similar Populations
- 04280, ME: more DSL coverage, faster speeds
- 62205, IL: more DSL coverage, faster speeds
- 53520, WI: more DSL coverage, faster speeds
- 54002, WI: less DSL coverage, faster speeds
- 54011, WI: more DSL coverage, similar speeds
- 54801, WI: more DSL coverage, faster speeds
- 56267, MN: more DSL coverage, similar speeds
- 60484, IL: more DSL coverage, faster speeds
- 62088, IL: more DSL coverage, faster speeds
- 51566, IA: more DSL coverage, faster speeds