1845
W. F. Williston served as Clerk of the Board of Supervisors, and other county officials listed for 1845 include Wm. F. Tompkins, Volney Atwood, H. Williston, B. Lapham, and Isaac Woodle.
The evidence
“Clerk of the Board of Supervisors, G. H. -Williston. 1845 — W. F.”
1879-history-of-rock-county/10-rock-county-ch04-early-maps-courts-railroads.md, PDF p. 368 / book p. 372
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources · may repeat 1856-history-of-rock-county, so not counted as independent
On the printed page (PDF p. 368 / book p. 372) · open the whole page “H. Williston, 1845; Frank Wheeler, 1847;”
1856-history-of-rock-county/03-rock-county.md, PDF p. 46 / book p. 28
Guernsey, Orrin, and Josiah F. Willard, editors. History of Rock County, and Transactions of the Rock County Agricultural Society and Mechanics' Institute. Janesville, Wis.: William M. Doty & Brother, 1856. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871593.
Grade A: Found on a page of one of our sources
On the printed page (PDF p. 46 / book p. 28) · open the whole page