In this 2-volume series, acclaimed author William Dollarhide identifies Census Substitutes, as well as State Census Records for the U.S. The substitutes are those name lists derived from tax lists, directories, military lists, land ownership lists, voter registrations, and other compilations of names of residents for an entire state, one or more counties of a state, or one or more towns of a county. Thirty-seven states conducted colonial, territorial, or state censuses that are extant and available for research today. Usually taken between Federal Decennial Census years, these records often contain unique informatiion, and may even shed light on the lives of your ancestors that may have been on-the-move.
The Glenview Public Library owns these books. They are in the Reference room at:
R929.373 DOL GENEALOGY v. 1 and 2 Reference Material Genealogy / Local History
Illinois is in Volume 1, Eastern States, in Chapter 5, The Old Northwest.