Illinois

Illinois is a geopolitical subdivision of the United States of America.

Wesley Crusher transported Will Riker to 1950s Illinois to meet Jazz legend Stan Kenton as a birthday gift. (TNG short story: "Adventures in Jazz and Time")

Real World
A number of Star Trek authors reside in Illinois:
 * Anne E. Clements
 * Dylan Otto Krider
 * Robert J. Mendenhall