The 1910 census (Milan, Spokane County, WA) indicates that David L. HAWORTH was born c1855 in IA (parents born IL), and Clarissa was born c1873 in KS.

The 1860 census enumerates a David L. HAWORTH of the right age in Palmyra, Warren County, IA; parents were Wm. P. HAWORTH (born c1831 in IL) and Mary (born c1831 in IN). Children were George, David L., Elvira, Mary and Sarah, all born in IA.