In the 1870 U.S Census for Spring Lake, Ottawa County, Michigan the family of Lewis Barnum was enumerated as follows:
Dwelling #96; Family #105
Barnum, Lewis; 40; M; W; Hotel Keeper; Real property $5,000; Personal property $2,000; b. Connecticut; Male citizen of US of 21 years of age and upwards
Barnum, Frances; 32; F; W; Keeping house; b. Connecticut
Barnum, Brigham; 7; M; W; At school; b. Connecticut; Attended school within the census year
Barnum, Betsy; 2/12; F; W; b. Michigan; b. Apr 1870
Barnum, Samuel; 73; M; W; Painter; Personal property $170; b. Connecticut; Male citizen of US of 21 years of age and upwards