Onawa Public Library
Carnegie Grant Information
Town & County
Twelfth Census of the United States — 1900. p. 450.
Onawa is the county seat of Monona County, which was established on January 15, 1851. Monona is of Native American origin. In 1854, the county seat was located in Bloomfield, which was renamed Ashton. In 1858, the county seat was moved to Onawa.
(Source: Pratt, LeRoy G. “The Counties and Courthouses of Iowa.” Mason City, Ia; Klipto Printing & Office Supply Company, 1977, p. 232.)