The Clinton post office was established.

The evidence

• “The first post ofiice established in the town of Clinton was opened at Summerville, on August 12, 1843, William Stewart being at the head of affairs. He remained in office until January 11, 1850, when he was succeeded by Reuben P.”

  1879-history-of-rock-county/16-rock-county-ch10-villages.md, PDF p. 652 / book p. 656

  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

• “The Clinton Postoffice was established August 12, 1843, with Stephen Perley as postmaster. On July 12, 1844, Griswold Weaver succeeded him.”

  1908-brown-rock-county/31-smaller-cities-villages-towns.md, Vol. 2, PDF p. 135 / book p. 644

  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