The birth date of John Agnes is based upon him being 46 in the 1870 federal census for Lenawee County, Michigan. His occupation was carpenter. The family real estate value was $3,000 and the personal estate value was $1,000.
John married Catherine Coller, daughter of Jesse Brace Coller and Sarah Losey. (Catherine Coller was born on 1 May 1826 in New York.)