Jacob Mainzer was born 1835 in Prussia, Near Mainz, Germany. He married Caroline Gendron.
Children of Jacob Mainzer and Caroline Gendron are:
+Justina Catherine Mainzer, b. 01 Mar 1866, St.Paul, Minnesota, USA, d. 06 Oct 1944, San Fransico, CA, USA, Buried, family plot, Holy Cross Cemetary, St. Paul MN. USA.