Black on reflective yellow with border line; "19 ILLINOIS 75" at top.
"LAND OF LINCOLN" centered at bottom
*Issued in the colors of Peoria-based Caterpillar Inc., in honor of its 50th anniversary.[5][6] *Three-letter prefix program expanded from about 800 combinations in 1974 to 2,851.[7][8]
^Fox, Jams K. (1997). License Plates of the United States: A Pictorial History 1903-To the Present. Jerico, New York: Interstate Directory Publishing Company. ISBN9781886777002.
^Minard, Jeff; Stentiford, Tim (2004). A Moving History, 50 Years Of ALPCA. 100 Years Of License Plates. Paducah, Kentucky: Turner Publishing Company. p. 58. ISBN1-56311-975-7.