In the 1850 US Census for Sunfield, Eaton County, Michigan the family of Lewis Barnum, Jr. was enumerated as follows:
Dwelling #1253; Family #1277
Lewis Barnum, Jr., 28, M, Farmer, Real property $1,000, b. New York
Harriett Barnum, 19, F, b. New York
Washington Barnum, 1, M, b. Michigan
[Note: his father and mother were living next door and his older brothers Daniel and Willis nearby].
His birthdate was calculated from the age at time of death given on his death certificate.