Punch in a zipcode and radius, and you get the population in that radius!!
For a svc. oriented bidness, can be a good clue as to where to centralize a location.
From fuknYonkers, a 50 mi radius yields 19,000,000 assholes; a 100 mi radius yields 29,000,000 assholes..... wow....
Now, avg income would certainly help, but general knowledge of areas might suffice as well. Like, for me'n'my fitness/rehab gadgets, I could pretty much remove Camden, NJ for field installations..... LOL
The US census site sposedly has a similar thing, and they tell you all about it, except how to load the effing program. Sposedly you can create profiles'n's*it.
Sumpn others might find inneresting, mebbe others have other tips/tricks.