http://www.sos.state.il.us/depts/archives/database.html Try The above site for lots of info about Illinois research. It gives you all of the information about obtaining Original Illinois Marriage certificates. If you go to the Illinois Marriage record index you will find all of the people you asked about that were married in Rock Island Cty-- Zachariah Cook/Ellen D. Callahan--3-20-1890 (just enter , under Groom, "Cook, Zachariah") Abraham Cook/Phoebe Holdsworth George Grear/Mariam Cook--1-11-1888 Then you can also contact IRAD at Western Illinois University to see if they have other records. All info on how to do this is at the above URL. Bev in Texas