In 1816, he married Anna Maria, the sister of William Hamilton Merritt who was captain in the same unit and became Ingersoll's partner in business after the war. Ingersoll helped found the town of Ingersoll which he named after his father. With his brother James, he built a sawmill, gristmill, potash plant and distillery there, also establishing a general store and serving as postmaster.
In 1816, Ingersoll wed Anna Maria, the sibling of William Hamilton Merritt who was captain in the same military unit and later became his business partner after the war. Ingersoll played a role in establishing the town of Ingersoll, which he named after his father. Alongside his brother James, they built various industrial facilities, including a sawmill, gristmill, potash plant, and distillery, as well as a general store and post office.