Born in Gudbrandsdalen, Norway, Warner emigrated to the United States in 1849 and settled in Dodge County, Wisconsin. In 1855, Warner settled in Ellsworth, Pierce County, Wisconsin. He was in general business and farming. Warner served in the 37th Wisconsin Volunteer Infantry Regiment during the American Civil War. From 1869 to 1877, Warner served as county clerk for Pierce County. He then served as that state's twelfth Secretary of State, serving two terms from January 7, 1878, until January 2, 1882. He was a Republican and served under Governor William E. Smith. From 1883 to 1887, Warner served in the Wisconsin State Senate. He then served as president of the Wisconsin Board of Control until his death. Warner died at his home in Ellsworth, Wisconsin.
- 'Wisconsin Blue Book 1885,' Biographical Sketch of Hans B. Warner, pg. 423-424
- 'Hans Warner Dead,' Wisconsin State Journal, August 18, 1896, pg. 4
- Anderson, William J. (1929). William A. Anderson, ed. The Wisconsin blue book, 1929. Madison, Wisconsin: Democrat Printing Company. p. 144. Retrieved 2008-08-23.
- Barish, Lawrence S. (ed.) (July 2007). "Chapter 8: Statistical Information on Wisconsin". State of Wisconsin Blue Book 2007–2008 (PDF). Madison, Wisconsin: Wisconsin Legislative Reference Bureau. p. 721. ISBN 978-0-9752820-2-1. Retrieved 2008-08-23.
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