National Register of Historical Places - Madison County - http://www.historicdistricts.com/IA/Madison/state.html Provides a listing of properties, districts, and landmarks in the county. Includes architectural style and period of significance.
The Political Graveyard: Madison County, Iowa - http://politicalgraveyard.com/geo/IA/MD.html#DIED Database provides political history, cemetery locations, and brief biographies of politicians who died in the county.
Madison County Historical Society - http://www.madisoncountyhistoricalsociety.com/ Purpose is to promote the acquisition, preservation, and display of artifacts of the social, cultural and natural history of the region. Provides a complex of 14 buildings near Winterset. Includes membership details, photos and resource links.
Wikipedia: Madison County, Iowa - http://en.wikipedia.org/wiki/Madison_County,_Iowa Encyclopedia article presents geography, demographics, and links to covered bridges and localities. With photograph and maps.
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