Anyone have advice on finding areas that are currently without cable/dsl?

Is there any sort of government or other organization which keeps track of this sort of information? We would like to expand, but how do you chose a good location?

We drive around and look for cable on the poles or pedestals in the yards.

You can also usually tell by the concentration of sat dishes and obviously houses who have sat internet usually have no other options.

If you find an area you are thinking about look for the telephone numbers by a reverse address lookup and do a DSL check to see if they qualify…