Just for some data:
BSU - 50 Indiana kids
IU - 43 Indiana kids
PU - 40 Indiana kids
ND - 8 Indiana kids
I think finding linemen in Indiana is probably a pretty safe bet but if you're not getting your skill positions from Sunshine states where they play football year round, you're likely putting yourself at a disadvantage. The best years in Sycamore history we had QBs from California, for example.
I think taking it a step further, the Wabash Valley isn't a big enough population center to have 16 kids unless there are a lot of walk-ons in that group.