Johann Heinrich Heldt married 28 February 1741 in Georgenhausen to Anna Eva Wagner. She was born 5 June 1720 in Georgenhausen.
They immigrated to Denmark (Schleswig-Holstein) and settled in the colony of Neubörm. From there, they immigrated to Russia arriving in Dönhof on 2 July 1766. Johann Heinrich is serving as the Beisitzer (vice-mayor) of Dönhof and is recorded there on the 1767 Census in Household No. 2. Son Johann Jakob and his family are recorded in Household No. 25.
- Eichhorn, Alexander, Jacob & Mary Eichhorn. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 (Deiningen, Germany: Drukerei und Verlag Steinmeier GmbH & Co. Kg, 2012): 440.
- Lang, Gerhard. German Colonists of Denmark on the Volga.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Dh019, Dh065.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 341 & 347.