As a general rule, it is often hard to find this out. Broadband providers (typically the phone and cable companies) regard that as proprietary information (they don't want their competitors to know their exact service area).
It never hurts to ask the providers where they offer service, and sometimes they will provide a map of their service area without revealing exact percentages of homes served. From this you can often come up with a pretty good estimate.
Looking for broadband
As a general rule, it is often hard to find this out. Broadband providers (typically the phone and cable companies) regard that as proprietary information (they don't want their competitors to know their exact service area).
It never hurts to ask the providers where they offer service, and sometimes they will provide a map of their service area without revealing exact percentages of homes served. From this you can often come up with a pretty good estimate.