In 21756 there are 2 residential Cable providers covering 99.48% of the zip. The average home can get speeds up to 1,729 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 Cable internet providers in 21756, MD.
To see availability maps for all providers including fiber, cable, DSL, and more in 21756, MD please click below.
Cable Internet Service Providers in 21756
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 21756 are not shown.
21756 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 21756 is cable internet available?
Cable Internet Availability Key
Cable is available in 99.48% of 21756. Areas in green have cable internet service, where areas in yellow or red may not. The most widely available provider is XFINITY. Call one of the companies with service in 21756 above to see who has service at your home.
How fast is cable internet in 21756?
The map below shows maximum cable internet speeds by area in 21756.
Cable Internet Speed Key
The average 21756 home can get up to 1,729 Mbps on their cable internet plan. The fastest cable download speed in the zip is 2,000 Mbps, which 61.14% 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 1,200 Mbps. See the internet provider details below for info about their speed and coverage in 21756.
Cable internet speeds tend to be faster in the north parts of 21756, and slower in the southeast areas of the zip.
Is cable the fastest internet I can get in 21756?
The fastest internet for you may vary based on where in 21756 you live. In general, fiber competes most often with cable in the zip.
- Fiber is the fastest internet type for 34.87% of 21756 homes.
- Cable is fastest for 64.61% 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 21756 homes.
Cable Providers in Depth
Below you'll find which TV and internet providers offer service in 21756, along with details on where in 21756 and at what speeds.
XFINITY from Comcast Cable in 21756, MD
XFINITY cable coverage
About 67.57%, or 2,488 people, have XFINITY cable internet available to them in the zip. The company covers the north, west, central, east, northwest, southwest, south, and northeast 21756 area. XFINITY is one of the largest internet service providers internet service providers in the US, with internet service available in much of 21756.
XFINITY from Comcast cable download speeds
XFINITY is above average when comparing download speeds to all other internet providers in 21756. Versus other cable providers in the area, XFINITY cable is the fastest. There are 2 different maximum speeds throughout 21756. The fastest plan anyone in 21756 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 21756 customers is up to 1,924 Mbps.
Show all download speeds
- 90.5% up to 2,000.0 Mbps
- 9.5% up to 1,200.0 Mbps
XFINITY from Comcast cable upload speeds
In 21756 download speeds tend to be faster than than upload speeds for XFINITY cable. Compared to other ISPs, XFINITY is below average where upload speeds are concerned, and the fastest compared to other 21756 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 21756 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 230 Mbps.
Show all upload speeds
- 90.5% up to 250.0 Mbps
- 9.5% up to 35.0 Mbps
Antietam Broadband Cable in 21756, MD
Antietam Broadband cable coverage
About 59.23%, or 2,181 people, have Antietam Broadband cable internet available to them in the zip. The company covers the southeast, west, southwest, east, central, south, north, and northwest 21756 area. Antietam Broadband is a large internet service provider internet service providers in the US, with internet service available in a majority of 21756.
Antietam Broadband cable download speeds
Antietam Broadband is above average when comparing download speeds to all other internet providers in 21756. Versus other cable providers in the area, Antietam Broadband cable is the slowest. There are no different maximum speeds throughout 21756. The fastest plan anyone in 21756 can order from Antietam Broadband goes up to 1,300 Mbps, and all 21756 customers can get this speed.
Show all download speeds
- 100.0% up to 1,300.0 Mbps
Antietam Broadband cable upload speeds
In 21756 download speeds tend to be faster than than upload speeds for Antietam Broadband cable. Compared to other ISPs, Antietam Broadband is below average where upload speeds are concerned, and the slowest compared to other 21756 cable providers. Antietam Broadband offers no different upload speeds across the zip. The fastest upload speed available to anyone from this ISP in 21756 is up to 50 Mbps, which is available to everyone covered.
Show all upload speeds
- 100.0% up to 50.0 Mbps
21756 Cable by Area
This information is most helpful to those looking for homes or considering moving to 21756 or any of the areas nearby.
How does cable internet in 21756 compare to the rest of Maryland?
Cable internet speeds in 21756 are much faster versus the average speeds in Maryland: 0.00 Mbps in Maryland versus 1,729 Mbps in the zip. The state has similar cable availability compared to the zip. Average cable coverage in Maryland is 0.00% versus 99.48% in 21756.
What zip codes have cable internet?
Cable internet coverage varies by zip code and neighborhood. Some examples in or around 21756 are shown below. You can enter any zip code here to see TV and internet providers by zip code.
What does cable 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
- 21782, MD: less cable coverage, slower speeds
- 21779, MD: more cable coverage, slower speeds
- 21713, MD: less cable coverage, slower speeds
- 21718, MD: more cable coverage, faster speeds
- 25443, WV: less cable coverage, slower speeds
- 21733, MD: more cable coverage, slower speeds
- 21746, MD: less cable coverage, slower speeds
- 21781, MD: more cable coverage, slower speeds
- 21769, MD: less cable coverage, faster speeds
- 21773, MD: less cable coverage, faster speeds
Zip Codes with Similar Populations
- 98631, WA: less cable coverage, slower speeds
- 02576, MA: more cable coverage, faster speeds
- 08327, NJ: less cable coverage, slower speeds
- 64070, MO: less cable coverage, slower speeds
- 54738, WI: less cable coverage, slower speeds
- 55604, MN: less cable coverage, slower speeds
- 74653, OK: less cable coverage, slower speeds
- 70341, LA: less cable coverage, slower speeds
- 62018, IL: less cable coverage, slower speeds
- 01929, MA: more cable coverage, faster speeds