Jakob Marx, a farmer, his wife Anna, and son Christian (age 2) are recorded on the 1767 census of Nieder-Monjou in Household No. 14. They had settled there on 23 July 1767.
In 1786, widow Anna Maria Marx and her children moved from Nieder-Monjou to Katharinenstadt. They are recorded there on the 1798 census in Household No. Ka112.
The 1767 census records that Jakob Marx came from the German region of Ansbach.
There are no known surviving male lines of this Marx family among the Volga German colonies.
- 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): Ka112, Mv1907.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 188.