1790 Census - Easton Twp., Washington, New York.
1800 Census - Cazanovia, Madison, New York.
Administration of Jonas Ketcham, Madison County, New York.
Madison & Chenango County, New York Land Records.
Bible Records of Surmantha Bennet & Jacob Bennet - Lists birthdates of all thirteen children.
An Isaac Ketcham died 4 Jan 1870 Lansing City, Inghan, Michigan, age 72, born NY.
Anna Ketcham, died Lansing City 21 May 1873, 74y, 6mo, 19d, b. Conn., dau of Jonathan & Phebe Hunt.
First Presbyterian Church, Cazenovia, Madison, N.Y.- Marriage of Deborah Ketcham and Mr. Powers, 1799.
Parents of Jonas may be Benjamin Ketcham and Elizabeth Sprague.