Here are a few in the Northern Illinois area. These are mostly local guys from all divisions who come back to play around home.
Midwest Collegiate League - http://www.midwestcollegiateleague.com/league/about/
Chicago Suburban Baseball League - http://www.hometeamsonline.com...=CSBL&s=baseball
Metropolitan Collegiate Summer Baseball League of Illinois - http://www.metrocollegebasebal...EBALL&s=baseball
The CSBL teams can advance to the NABF World Series.