Is there a law in Du Page county Illinois Downers Grove Twsp that says a mailbox must be 8 from the edge of the street to the mailbox front?

Answer 1

You are probably referring to U.S. Postal Regulations which govern how far from a street edge and how high a roadside mailbox must be. The box must be placed at least 42 inches high and must be easily reachable from the window/door of the mail delivery vehicle.