In the 1850 US Census for Sunfield, Eaton County, Michigan the family of Lewis Barnum, Sr. was enumerated as follows:
Dwelling #1252; Family #1276
Lewis Barnum, 67, M, Farmer, b. Massachusetts, Person over 20 years of age who cannot read & write
Margaret Barnum, 66, F, b. New York, Person over 20 years of age who cannot read & write
[Note: their children Daniel, Willis and Lewis, Jr. were all living within a few houses of them].