That part of Janesville in township 3 north, range 14 east, was detached and organized into a separate town.

The evidence

• “February 17, 1842, Township 3 and the north half of Township 2 north, of Ranges 13 and 14 east, and all that part of Townships 3 and 4 north, of Range 12 east, lying east of Rock River, were organized into a separate town by the name of Janesville. On the 21st of March, 1843, that part of the town of Janesville comprised in Township 3 north, of Range 14 east, was detached and organized into a separate town. On the same day.”

  1879-history-of-rock-county/13-rock-county-ch07-town-histories.md, PDF p. 506 / book p. 610

  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

  

• “Organized in 1843, having before that time been a part of Janesville.”

  1856-history-of-rock-county/10-johnstown.md, PDF p. 104 / book p. 86

  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