Johannes married Susanna Maria Katharina Schwarz on 14 Jun 1792 in Annweiler am Trifels, Pfalz, Bayern. Susanna (daughter of Daniel Schwarz) was born in 1771. [Group Sheet] [Family Chart]

1. Susanna Katharina Mühlhäuser was born on 12 May 1793 in Annweiler am Trifels, Pfalz.
2. Johannes Heinrich Mühlhäuser was born on 3 Sep 1795 in Annweiler am Trifels, Pfalz.
3. Anna Maria Mühlhäuser was born on 12 Nov 1797 in Annweiler am Trifels, Pfalz, Bayern.
4. Anna Maria Mühlhäuser was born on 13 Sep 1800 in Annweiler am Trifels, Pfalz, Bayern.
5. Friederika Mühlhäuser was born on 10 Feb 1803 in Annweiler am Trifels, Pfalz.
6. Johannes Christian Mühlhäuser was born on 6 Nov 1805 in Annweiler am Trifels, Pfalz.