Mattias Gropp, a linen weaver (Leineweber) and his wife Anna are recorded on an appendix to the 1767 census of Nieder-Monjou in Household No. 41.
Mattias Gropp and his family are recorded on the 1798 census of Basel.
His descendants are recorded on the 1834 census of Basel in Household No. 21.
The 1767 census records that Mattias Gropp came from the German village of Geislitz in the Hanau region.
- 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): Bs13.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 213.