Salomon de Jongh was a son of Meijer Hartog de Jongh and Hindelina van Menk. He married Rosetje Schwarz in 1894 in Zutphen. She passed away in 1924 in Nijmegen.
Stadsarchief Amsterdam, archiefkaart Salomon de Jongh
Salomon de Jongh took his own life under pressure of the circumstances.
NIOD, Records Joodse Raad, box 36d, letter dd. 4 December 1942
Salomon de Jongh is also commemorated on Jewish Monument Zaanstreek