The Abraham Lincoln Presidential Library and Museum  has some genealogy collections including:

online Obituary Index

online Newspaper Indexes

• Illinois State Journal Index #1 – 1831-1850
• Part 1 – A-Fumwell
• Part 2 – Fund-Nichols
• Part 3 – Nichols-Z
• Illinois State Journal Index #2 – 1851-1860
• Part 1 – A-Moore
• Part 2 – Moore-Z

an Oral History collection for memories of Illinois citizens,

and other collections and print indexes available onsite only.