An important issue to your poll that seems to be overlooked is that some people may not live where they contracted lyme, some just don't know. I live in Central Florida (not north or south) and may have gotten it here or any of these states I traveled through w/in a reasonalbe amount of time from first "becoming sick" (Georgia, South Carolina, North Carolina, Virginia, Tennessee and Kentucky)
Also, fyi for your additional studies, check out UNF, they were doing some interesting lyme studies. One of the most astounding facts I came across was the extrememly high percentage of LIZARDS that tested lyme positive. It is thought lyme comes from several sources; biting flys, mosquitos, etc. not just ticks.