"Bibliography of McDonough County" by Gordana Rezab

also available online here:

http://www.archive.org/details/westernillinoisr_a101west

Author: Bateman, Newton, 1822-1897; Selby, Paul, 1825-1913; McLean, Alexander, 1833-1907
Title:  Historical encyclopedia of Illinois

Publisher: Chicago : Munsell Pub. Co.

Year: 1907

http://www.archive.org/details/historicalencyc01bate

Author: Clarke, S.J.

Title: The History of McDonough County, Illinois.

Publisher: Springfield, IL: D.W. Lusk, state printer

Year: 1878

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 .

Author: Drury, John, 1898-

Title: American aerial county history series Volume: 7 (MCDONOUGH)

Publisher: Chicago : Loree Co

Year: 1954

http://www.archive.org/details/americanaerialco07drur

Author: Hallwas, John

Title: McDonough County Historic Sites

Publisher: Chicago: Arcadia Publishing

Year: 2002

http://tinyurl.com/6zoat2b

[please note: only first 37 pages of this book are online]

Author: Hicks, Frank G., 1982-
Title:The little road : the story of the Macomb Industry & Littleton Railway Publisher: Macomb, Ill. : Western Illinois University
Year: 2006

http://www.archive.org/details/littleroadstoryo00hick  

Title: History of McDonough County, Illinois, together with sketches of the towns, villages and townships, educational, civil, military and political history; portraits of prominent individuals, and biographies of the representative citizens.

Publisher: Springfield, Ill. : Continental Historical Co.

Year: 1885

 http://www.archive.org/details/historyofmcdonou00spri

Title: Portrait and biographical record of Hancock, McDonough and Henderson counties, Illinois : containing biographical sketches of prominent and representative citizens of the county

Publisher: [Chicago, Ill.] : Lake City Pub. Co

Year: 1894

http://www.archive.org/details/portraitbiographi00chicag

Author: Rezab, Gordana. 

Title: Place Names of McDonough County, Illinois:  Past and Present.  Publisher: Macomb, IL: Western Illinois University,

Year: 2008

http://www.archive.org/details/placenamesofmcdo00reza

Author: Western Illinois Horse Sales Co

Title:  See the good ones attend the auction sale of light harness horses to be held at the fair grounds : Macomb, Ill., Thursday, March 13, 1913

Publisher: Macomb, Ill. : The Company

Year: 1913

http://www.archive.org/details/seegoodonesatten00west

Digital Image Collection (Western Illinois University)

Database of historical images of people, places, events - keyword searchable - many images of McDonough County and surrounding counties

http://collections.carli.illinois.edu/cdm4/index_wiu_digimgc.php?CISOROOT=/wiu_digimgc

Historical Society Newsletters (Western Illinois University)

Database of newsletters of area Historical Societies.

This collection features Historical Society newsletters from the west-central Illinois counties of Hancock (1987-), McDonough (1982-) [including Colchester Area Historical Society (1995-)], Rock Island (1966-), and Schuyler (1969-).

http://collections.carli.illinois.edu/cdm4/index_wiu_hsn.php?CISOROOT=/wiu_hsn

[note McDonough County Historical Society newsletters available online are from 1982-1997 only]

All Sorts of McDonough County Information !

http://mcdonough.illinoisgenweb.org/