The town of Union was incorporated (then including what is now Union, Porter, and the north half each of Center and Magnolia).

The evidence

• “This is the most northwestern town in Rock County, and sixteen miles northwest of Janesville. It was incorporated by act of the Legislature, approved February 17, 1842, and at that time included what is now Union, Porter, and the north half each of Center and Magnolia. Its present limits are included in what is known as Township 4, north of Range 10 east.”

  1879-history-of-rock-county/13-rock-county-ch07-town-histories.md, PDF p. 524

  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