The first of a series of indexes to naturalizations in the Circuit Court after 1906 has just been posted. Be sure to also read the "Primary naturalization page" link provided for information on the three courts that performed these duties before 1906, and the three courts that did so after 1906:
NOTE: This is a cooperative project by Jim Moore and the St. Clair County Genealogical Society. Kudos to Jim for all his hard work!
St. Clair County (IL) Rootsweb Page: http://www.rootsweb.ancestry.com/~ilstclai/stclair.htm