In 21821 there are 6 residential internet providers covering 100.00% of the zip. The average home can get speeds up to 1,564 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.
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6 Internet Service Providers in 21821
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 21821 are not shown.
21821 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
Availability maps for all providers in 21821
Using the dropdown below, please select a provider. Green indicates nearly all homes have service, red indicates few homes have service, and blank indicates no service.
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Internet service is available in 100.00% of 21821. Using our interactive availability map, you can compare service areas for different providers, we include fiber, cable, DSL, or fixed wireless internet service for all providers who offer it. You will notice that some providers might be listed multiple times for each service. If you find no providers cover the location you're looking at, you can opt for satellite service. The most widely available provider is XFINITY. Now you can call companies in 21821 with more confidence that they might be available.
How fast are internet speeds in 21821?
The map below shows maximum internet speeds by area in 21821.
Internet Speed Key
The average 21821 home can get up to 1,564 Mbps on their internet plan. For most people, the fastest download speed in the zip is 2,000 Mbps, which 46.04% of residents can get. Some homes and apartments do not have access to these speeds. On the slower end, for example, less than 1% of homes can only purchase plans up to 25 Mbps. See the internet provider details below for info about their speed and coverage in 21821.
Internet speeds tend to be faster in the central parts of 21821, and slower in the northeast areas of the zip.
What type of internet should I choose in 21821?
The fastest internet for you may vary based on where in 21821 you live. If speed is your main concern, cable will be the fastest internet in the zip.
- Fiber is the fastest internet type for less than 1% of 21821 homes.
- Cable is fastest for 99.65% 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 21821 homes.
Internet Market Health in 21821
Internet Competition Key
The map shows how competitive the 21821 internet service market is. Areas in green have more alternatives, areas in yellow have a few choices, and areas in red may have only one provider. More competition usually means faster speeds and better prices for you, the customer.
Below are quick facts on internet competition and market health in 21821 based on what connections the average home has availabile:
- Average number of internet service providers to a home: 3.3 (very unhealthy)
- Average types of service (fiber, cable, DSL, etc): 2.0 (very unhealthy)
- Average providers with broadband (25 Mbps+) speeds: 3.3 (unhealthy)
Overall, competition is very unhealthy.
21821 internet customers have the ability to buy internet service from 1 to 4 different providers, depending on where they live. For different types of service, 21821 homes have between 1 and 2 options. The type(s) of service available are fixed wireless and cable, though these may vary depending on the region within the zip.
When it comes to broadband download speeds faster than 25 Mbps, the situation is similar. 21821 internet customers who want faster speeds have between 1 and 4 choices of companies offering speeds up to or over 25 Mbps.
More internet companies with faster speeds means fewer monopolies and better prices for customers. In promoting a free market for internet, 21821 badly needs improvement.
TV & Internet Providers in Depth
Below you'll find which TV and internet providers offer service in 21821, along with details on where in 21821 and at what speeds.
XFINITY from Comcast Cable in 21821, MD
XFINITY cable coverage
About 99.65%, or 844 people, have XFINITY cable internet available to them in the zip. The company covers the entire 21821 area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in most of 21821.
XFINITY from Comcast cable download speeds
XFINITY is the fastest when comparing download speeds to all other internet providers in 21821. Versus other cable providers in the area, XFINITY cable is the fastest. There are 2 different maximum speeds throughout 21821. The fastest plan anyone in 21821 can order from XFINITY goes up to 2,000 Mbps, the slowest package only goes up to 1,200 Mbps, and the zip-wide average maximum speed for 21821 customers is up to 1,570 Mbps.
Show all download speeds
- 46.2% up to 2,000.0 Mbps
- 53.8% up to 1,200.0 Mbps
XFINITY from Comcast cable upload speeds
In 21821 download speeds tend to be faster than than upload speeds for XFINITY cable. Compared to other ISPs, XFINITY is the fastest where upload speeds are concerned, and the fastest compared to other 21821 cable providers. XFINITY offers 2 different upload speeds across the zip, so your internet plan's upload speed may vary by neighborhood . The fastest upload speed available to anyone from this ISP in 21821 is up to 250 Mbps. Some customers have slower plan choices, which only go up to 35 Mbps. On average, XFINITY customers can get speeds up to 134 Mbps.
Show all upload speeds
- 46.2% up to 250.0 Mbps
- 53.8% up to 35.0 Mbps
Bloosurf Fixed Wireless in 21821, MD
Bloosurf fixed wireless coverage
About 100.00%, or 847 people, have Bloosurf fixed wireless internet available to them in the zip. The company covers the entire 21821 area. Bloosurf is a large internet service provider internet service providers in the US, with internet service available in every corner of 21821.
Bloosurf fixed wireless download speeds
Bloosurf is one of the slowest when comparing download speeds to all other internet providers in 21821. Versus other fixed wireless providers in the area, Bloosurf fixed wireless is one of the fastest. There are no different maximum speeds throughout 21821. The fastest plan anyone in 21821 can order from Bloosurf goes up to 25 Mbps, and all 21821 customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
Bloosurf fixed wireless upload speeds
In 21821 download speeds tend to be faster than than upload speeds for Bloosurf fixed wireless. Compared to other ISPs, Bloosurf is one of the slowest where upload speeds are concerned, and one of the fastest compared to other 21821 fixed wireless providers. Bloosurf offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 21821 is up to 3.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 3.0 Mbps
EarthLink Fixed Wireless in 21821, MD
EarthLink fixed wireless coverage
About 65.76%, or 557 people, have EarthLink fixed wireless internet available to them in the zip. The company covers the southwest, northwest, north, and northeast 21821 area. EarthLink is one of the largest internet service providers internet service providers in the US, with internet service available in much of 21821.
EarthLink fixed wireless download speeds
EarthLink is one of the slowest when comparing download speeds to all other internet providers in 21821. Versus other fixed wireless providers in the area, EarthLink fixed wireless is one of the fastest. There are no different maximum speeds throughout 21821. The fastest plan anyone in 21821 can order from EarthLink goes up to 25 Mbps, and all 21821 customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
EarthLink fixed wireless upload speeds
In 21821 download speeds tend to be faster than than upload speeds for EarthLink fixed wireless. Compared to other ISPs, EarthLink is one of the slowest where upload speeds are concerned, and one of the fastest compared to other 21821 fixed wireless providers. EarthLink offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 21821 is up to 3.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 3.0 Mbps
AT&T Fixed Wireless in 21821, MD
AT&T fixed wireless coverage
About 65.76%, or 557 people, have AT&T fixed wireless internet available to them in the zip. The company covers the southwest, northwest, north, and northeast 21821 area. AT&T is one of the largest internet service providers internet service providers in the US, with internet service available in much of 21821.
AT&T fixed wireless download speeds
AT&T is one of the slowest when comparing download speeds to all other internet providers in 21821. Versus other fixed wireless providers in the area, AT&T fixed wireless is one of the fastest. There are no different maximum speeds throughout 21821. The fastest plan anyone in 21821 can order from AT&T goes up to 25 Mbps, and all 21821 customers can get this speed.
Show all download speeds
- 100.0% up to 25.0 Mbps
AT&T fixed wireless upload speeds
In 21821 download speeds tend to be faster than than upload speeds for AT&T fixed wireless. Compared to other ISPs, AT&T is one of the slowest where upload speeds are concerned, and one of the fastest compared to other 21821 fixed wireless providers. AT&T offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 21821 is up to 3.0 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 3.0 Mbps
21821 Internet by Area
This information is most helpful to those looking for homes or considering moving to 21821 or any of the areas nearby.
How does internet in 21821 compare to the rest of Maryland?
Internet speeds in 21821 are slower versus the average speeds in Maryland: 2,041 Mbps in Maryland versus 1,564 Mbps in the zip. The state has similar internet availability compared to the zip. Average internet coverage in Maryland is 98.96% versus 100.00% in 21821.
What zip codes have widespread internet?
Internet coverage varies by zip code and neighborhood. Some examples in or around 21821 are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does internet service 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
- 21840, MD: less internet coverage, slower speeds
- 21627, MD: equal internet coverage, slower speeds
- 21867, MD: equal internet coverage, slower speeds
- 21814, MD: equal internet coverage, slower speeds
- 21672, MD: less internet coverage, slower speeds
- 21675, MD: less internet coverage, slower speeds
- 21871, MD: equal internet coverage, slower speeds
- 21890, MD: equal internet coverage, faster speeds
- 21853, MD: less internet coverage, faster speeds
- 21838, MD: less internet coverage, slower speeds
Zip Codes with Similar Populations
- 12950, NY: less internet coverage, slower speeds
- 84082, UT: less internet coverage, slower speeds
- 21723, MD: equal internet coverage, slower speeds
- 83114, WY: less internet coverage, slower speeds
- 87830, NM: less internet coverage, slower speeds
- 16692, PA: less internet coverage, slower speeds
- 92368, CA: equal internet coverage, slower speeds
- 23413, VA: less internet coverage, slower speeds
- 12970, NY: less internet coverage, slower speeds
- 08511, NJ: equal internet coverage, faster speeds