If you have a specific question pertaining to

McDonough County history,

send your question, with as many details as possible to

mcdonoughhistoricalsociety@gmail.com

For county historical information see

McDonough County History

A great resource for McDonough County historical information is the Archives and Special Collections Unit of the Malpass Library at Western Illinois University, Macomb, Illinois.

http://www.wiu.edu/library/units/archives/

Another great resource of information is the McDonough County Genealogical Society

http://www.mcdcgs.com/

An excellent resource for information about the early history of the county is

The History of McDonough County by S. J. Clarke.  

Google has digitized this book, and it is fully "searchable". 

  http://tinyurl.com/66woqpd

You can also read this same volume online in a slightly different searchable format at

http://www.archive.org/details/historyofmcdonou01clar .

Sources of Information about McDonough County History (many of them online sources) can be found here: http://mcdonoughhistory.jimdo.com/mcdonough-county-history-sources-of-information/