Going to everyone's house seems multiple orders of magnitude more trouble than looking at where a car is most often parked, and seeing if you have anybody in yo

Going to everyone's house seems multiple orders of magnitude more trouble than looking at where a car is most often parked, and seeing if you have anybody in your database that lives, works, or has relatives (or facebook friends) that live at those addresses. I bet you'd get a unique hit 99.99% of the time if you have 10 years of data.