Clemens Vonnegut Sr. (November 20, 1824 – December 13, 1906) was a German emigrant to the United States and successful businessman. He was the patriarch of the prominent German-American Vonnegut clan (later Schnull-Vonnegut) of Indiana – he was the father and grandfather of architects Bernard Vonnegut I and Kurt Vonnegut Sr., respectively, and great-grandfather of scientist Bernard Vonnegut and author Kurt Vonnegut Jr.
In Indiana he formed Vollmer & Vonnegut retail hardware and sundry merchandise store with a German immigrant named Charles Vollmer (who left for the Wild West in 1852). After 1852, the firm was renamed Vonnegut Hardware Company, and remained under his family's control after his death.
Unfortunately, the house no longer exists.
508 East Market Street, Indianapolis, IN 46204