1855
Banks organized in 1855: the Janesville City bank and Rock County bank ; Wadsworth, Clark & Co. ; a State Bank, of which a Janesville man was cashier ; W. Smith engaged in banking ; and bodies buried in the old cemetery block were reburied in Oak Hill and Mt. Olivet in 1855–56 .
Rock CountyGrade A · 1 independent source
The evidence
“Badger State, 1853. Janesville City, 1855. Rock County, 1855. Producer's, 1857.”
1908-brown-rock-county/00-front-matter-vol-1.md, Vol. 1, PDF p. 14
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources