Johann Samuel Ismann, a locksmith (Schlosser), and his wife Margaretha Magdalena settled in the Volga German colony of Warenburg on 12 May 1767. They are recorded there on the 1767 census in Household No. 67 along with stepsons [surname Bernhardt] (Georg, age 18; August Martin, age 16; Johann Michael, age 13).
The death of Samuel Ismann in 1806 is recorded on the 1811 census of Warenburg in Household No. 87.
The 1767 census records that Johann Samuel Ismann came from the German region of Breslau.
There are no known surviving male lines of this family among the Volga German colonies.
- 1811 Warenburg Census (Household No. 87).
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Wr087.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 332.