When Johannes Dengler was born about 1758, in Seyboldsdorf, Vilsbiburg, Landshut, Bavaria, Germany, his father, Johann Conrad Dengler, was 34 and his mother, Maria Magdalena Gaertner, was 30. He married Eva Christina Eisenmenger on 16 September 1783, in Tulpehocken Township, Berks, Pennsylvania, United States. They were the parents of at least 4 sons and 2 daughters. He died in 1816, in Morgan, Georgia, United States, at the age of 58.