Jakob married Magdalena Ulmer on 11 Sep 1849 in Steinfeld, Pfalz, Bayern. Magdalena (daughter of Johannes Ulmer and Franziska Bühn) was born in 1828 in Steinfeld, Pfalz, Bayern. [Group Sheet] [Family Chart]

1. Katharina Kornmann
2. Franz Kornmann
3. Karl Kornmann
4. Elisabetha Kornmann was born in 1855 in Steinfeld, Pfalz, Bayern.
5. Johannes Georg Kornmann
6. Matthäus Kornmann was born on 22 Feb 1857 in Steinfeld, Pfalz, Bayern; was christened on 22 Feb 1857 in Steinfeld, Pfalz, Bayern; died in in Steinfeld, Pfalz, Bayern.