Thomas Koch, a glazier (Glaser), his wife Anna Belenski, and children (Heinrich, age 4; Angela, age 1) are recorded on the 1767 census of Katharinenstadt in Household No. 59. They had settled there on 27 August 1766.
The 1767 census records that Thomas Koch came from the Dutch village of Arnheim in Holland.
- 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): Ka011, Ka081, Ka109.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): 289.