Johannes married Eva Maria Magdalena Reinhardt on 9 Aug 1784 in Oberotterbach, Pfalz, Bayern. Eva (daughter of Johannes Georg Reinhardt and Maria Eva Vetter) was born on 20 Aug 1761 in Oberotterbach, Pfalz; died on 23 Apr 1803 in Oberotterbach, Pfalz. [Group Sheet] [Family Chart]

1. Katharina Barbara Hasslauer was born on 11 Dec 1784 in Oberotterbach, Pfalz; died on 24 Feb 1823 in Oberotterbach, Pfalz, Bayern.
2. Georg Michael Hasslauer was born on 1 Sep 1786 in Oberotterbach, Pfalz; died on 9 Sep 1841 in Böllenborn, Pfalz, Bayern.
3. Georg Jakob Hasslauer was born on 13 Aug 1788 in Oberotterbach, Pfalz; died on 7 Sep 1789 in Oberotterbach, Pfalz.
4. Georg Jakob Hasslauer was born on 8 Jul 1790 in Oberotterbach, Pfalz.
5. Maria Magdalena Hasslauer was born on 31 Jul 1792 in Oberotterbach, Pfalz; was christened on 31 Jul 1792 in Oberotterbach, Pfalz; died on 3 Feb 1820 in Böllenborn, Pfalz, Bayern.
6. Peter Hasslauer was born in 1797 in Oberotterbach, Pfalz, Bayern; died on 10 Mar 1820 in Oberotterbach, Pfalz, Bayern.

Johannes married Salome Stricker after 1803. Salome was born in 1782 in Oberotterbach, Pfalz, Bayern; died on 10 Apr 1825 in Oberotterbach, Pfalz, Bayern. [Group Sheet] [Family Chart]

1. Michael Hasslauer was born on 25 May 1804 in Oberotterbach, Pfalz, Bayern.
2. Katharina Elisabetha Hasslauer was born on 25 May 1804 in Oberotterbach, Pfalz, Bayern.
3. Maria Agathe Hasslauer was born on 22 Jun 1805 in Oberotterbach, Pfalz, Bayern.
4. Salomea Hasslauer was born on 30 Dec 1806 in Oberotterbach, Pfalz, Bayern; died in in Oberseebach, Wissembourg, Bas-Rhin, Alsace, France.
5. Katharina Barbara Hasslauer was born in 1808 in Oberotterbach, Pfalz, Bayern; was christened on 26 Oct 1808 in Oberotterbach, Pfalz, Bayern.
6. Georg Philipp Hasslauer was born on 13 Dec 1809 in Oberotterbach, Pfalz, Bayern; died on 23 Feb 1810 in Oberotterbach, Pfalz, Bayern.
7. Georg Philipp Hasslauer was born on 17 May 1811 in Oberotterbach, Pfalz, Bayern; died on 9 Jan 1812 in Oberotterbach, Pfalz, Bayern.
8. Maria Theresia Hasslauer was born on 13 Jul 1812 in Oberotterbach, Pfalz, Bayern.
9. Philipp Hasslauer was born on 2 Dec 1813 in Oberotterbach, Pfalz, Bayern; died on 13 Dec 1813 in Oberotterbach, Pfalz, Bayern.
10. Margaretha Hasslauer was born on 22 May 1815 in Oberotterbach, Pfalz, Bayern.
11. Katharina Hasslauer was born on 14 Mar 1817 in Oberotterbach, Pfalz, Bayern.
12. Georg Hasslauer was born on 12 May 1821 in Oberotterbach, Pfalz, Bayern.
13. Johannes Hasslauer was born on 20 Aug 1824 in Oberotterbach, Pfalz, Bayern.

Johannes married Maria Dorothea Nägler on 3 Jul 1753 in Bergzabern, Pfalz, Bayern. Maria was born in 1731 in Teinheim, Pfalz; died on 11 Feb 1787 in Oberotterbach, Pfalz. [Group Sheet] [Family Chart]