Exploring County Land Ownership Maps
Article by Ed Redmond at the Library of Congress Geography and Map Division, based on Richard W. Stephenson’s essay in Land Ownership Maps: A Checklist of Nineteenth Century United States County Maps in the Library of Congress
Illinois
Illinois State Library Location Guide of General Land Office Plat Maps
A guide to locating plat maps.
U.S. Surveyor General’s Records for Illinois — Federal Township Plats (1804-1891)
Scans of 3,457 plats in the collection of the Illinois State Archives that were surveyed by the office of the U.S. Surveyor General and the General Land Office.
United States
Library of Congress quick search for landownership maps
Scanned maps available for viewing and downloading
US General Land Office Records
Search and access more than 5 milling Federal land title records issued between 1788 and the present; provided by the US Bureau of Land Management.
Publishers
Rockford Map Publishers
Illinois publisher with nationwide plat book product list
FHP: Farm and Home Publishers
Publisher based in Iowa with plat book product list focusing on the upper Midwest