Brian, I don't know the internet topology out there. Once upon a time in the 1990s, anyone could pull up a map of the whole internet, all the trunk lines, the backbones and the MAE locations. After 2001, that kind of information started disappearing in the claim of national security.
So unless you can get a reliable map of the trunk lines in your area--that MAY actually be the closest server, the one with the shortest run of highspeed trunk or actual backbone that connects to your location.