Ancestry.com - Search Tax, Criminal, Land & Wills

Ancestry.com has searchable indexes; database results and some digitized images are available with a fee-based subscription.

FTP Illinois - Federal Township Plats of Illinois (1804-1891)

Searchable database of 3,457 digitized federal township plats for Illinois.

Illinois County Land Ownership Maps and Atlases

Provides information about Illinois County land ownership maps and atlases held by the Illinois State Library.

Illinois Land and Property | Learn | FamilySearch.org

Illinois Public Domain Land Tract Sales

Online searchable database of 550,000 land sales from the 54,740 square miles of the public domain sold within Illinois.

The Bureau of Land Management -- Eastern States, General Land Office

The Official Land Patent Records Site. This site has a searchable database of over two million pre-1908 Federal land title records, including scanned images of those records. The Eastern Public Land States covered in this database are: Alabama, Arkansas, Florida, Illinois, Indiana, Louisiana, Michigan, Minnesota, Mississippi, Missouri, Ohio, Wisconsin.