When Johann Wilhelm Yohn was born on 1 January 1773, in Gilbertsville, Douglass Township, Montgomery, Pennsylvania, United States, his father, John Yohn, was 31 and his mother, Anna Maria Betz, was 18. He married Margaret Elizabeth Peggy Hartman about 1796, in Saville Township, Perry, Pennsylvania, United States. They were the parents of at least 3 sons and 6 daughters. He died in 1842, in Saville Township, Perry, Pennsylvania, United States, at the age of 69, and was buried in Eshcol Memorial Cemetery, Saville Township, Perry, Pennsylvania, United States.