Don't know of any map, but I wouldn't trust the address part either. I did it, it said I could get service, so I orderd. Comcast truck shows up next day, hooks all the lines up then gets confused why the cable modem won't authorize or is even seen on the network.
To make a long story short. I'm not in a comcast service area, but they are in the county. Tech didn't even know he was messing with Charter's stuff on the pole.