Duff, William Jr.
Flourished: 1832-1834 Menard County, Illinois
By 1828, Duff lived in a part of Sangamon County, Illinois, that would later become Menard County. He had moved away from the county by 1840.
U.S. Census Office, Fifth Census of the United States (1830), Sangamon County, IL, 195; Election Returns for the New Salem Precinct in Sangamon County, Illinois; Election Returns for the New Salem Precinct in Sangamon County, Illinois; The History of Menard and Mason Counties, Illinois (Chicago: O. L. Baskin, 1879), 372.