- Calhoun County, Illinois, USA Township Map Community Map Illinois & the Civil War The Kingdom of Calhoun (or Calhoun County, Illinois, USA) is a long peninsula between the Mississippi & Illinois Rivers. Much of the Kingdom of Calhoun is virtually an island between two great rivers. The northern border to the mainland is less than 17 miles wide. The only other connections are the lone bridge ...www.outfitters.com/illinois/calhoun