Capt. MacDonald House is yet another designated building in Cornwall. It was 
built as a farmhouse in 1867 by Capt. Alexander J. MacDonald who settled there 
after his service in the American Army during the Civil War. He was instrumental in establishing the Roman Catholic Separate School Board in Cornwall and represented the Board for 16 
years. He was also a Major in the military formation in Cornwall to defend 
against the Fenians. The current lot has gone through little change, even trees 
planted by the family in 1867 to celebrate Confederation still stand. MacDonald family members have continually lived in the house since it was built.