The midwest is strange like that. It's not a place where people typically think of regarding illegals aliens, but there are a few towns that are known for having illegal where I live that have somewhere around 25% illegal or so like you mention. Then you go 10 miles down the road to the next town and there's almost no illegals to be seen.
The reverse discrimmination is pretty digusting, but I guess that's what happens when a 2nd class citizen status is created due to the inaction of the federal government. Sounds like a pretty bad situation, illegals come in to town take your job, then their kids get preferential treatment in the schools.