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, he married Anna Maria, the sibling of William Hamilton Merritt who was captain in the same battalion and became Ingersoll's business associate after the war. Ingersoll assisted in founding the town of Ingersoll which he named after his father. Alongside his brother James, he constructed a sawmill, gristmill, potash factory, and distillery there, also establishing a general store and serving as postmaster.