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'shit.
Sumpn others might find inneresting, mebbe others have other tips/tricks.