Since her husband died in 1854, Sarah appears as the head of household in the US Census of 1860 and 1870 for Ohio.
In the 1860 US Census for Washington, Morrow County, Ohio the family of Sarah Barnum was enumerated as follows:
Household #725; Family #723
Sarah Barnum, 40; F; W; Housework; Real property $2,200; Personal property $2,000; b. Maine
Olive A. Barnum; 14; F; W; b. Ohio
Loyal L. Barnum, 13; M; W; b. Ohio
Laura A. Barnum; 9; F; W; b. Ohio
Florence F. Barnum; 6; F; W; b. Ohio
In the 1870 US Census for Washington, Morrow County, Ohio the family of Sarah Barnum was enumerated as follows:
Household #99; Family #99
Barnum, Sarah; 50; F; W; Keeping house; Personal property $5,100; b. Maine
Barnum, Olive; 24; F; W; At home; b. Ohio
Barnum, Levi; 23; M; W; Shoemaker; b. Ohio; Male citizen of US 21 years of age and upwards
Barnum, Laura; 19; F; W; b. Ohio; Attended school within the year
Barnum, Florence; 16; F; W; b. Ohio; Attended school within the year
In the 1880 census she was living in Mason City, Cerro Gordo, Iowa with the family of her son Levi Loyal Barnum, Jr.