While searching for the 1940 US Census, I was able to track down a few previous census records I had been missing. Below is the 1920 US Census for Julius Yunghans.
Julius (line 92, second family from the the bottom) was living with wife Minnie (Kirsch) and their two children, Marie and Arthur in the city of Vincennes, Knox county, Indiana.
Julius was employed as a cigar maker, most likely working for his father, Emil Yunghans at the Yunghans Cigar factory. The occupation of daughter Marie is listed as "sales woman" at a five and dime store.
Julius was the eldest son of Julia (Kolb) and Emil Heinrich Junghans/Yunghans and the grandson of Christliebe (Kuehn) and Carl Heinrich Junghans.