April 3, 1849
The first town meeting of the new town (La Prairie) was held at the house of Justus P. Wheeler; fifty-six votes were cast. (P18 prints this as the "8d day of April, 1849.")
The evidence
“It received its name from the fact that the whole town is almost entirely an open, unbroken prairie. The name is from the French, signifying " the meadow, or, the pasture." It was organized by act of the Legislature,, approved March 26, 1849, by which act those parts of the towns of Harmony and Turtle, which were then comprised in Township 2 north, of Range 13 east, were set oiFand organized as a separate town. The west half of Section 6 was subsequently set off to the city of Janesville. The first town meeting was held at the house of Justus P. Wheeler, on the 3d day of April, 1849 ; whole number of votes cast at this meeting was fifty-six. The town officers elected were : Justus P.”
1879-history-of-rock-county/13-rock-county-ch07-town-histories.md, PDF p. 509 / book p. 513
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
On the printed page (PDF p. 509 / book p. 513) · open the whole page “It received its name from the fact that the whole town is almost an entirely open and unbroken prairie. The name is from the French, signifying ''The Meadow or the Pasture." It was organized by act of legislature approved March 26, 1849, by which act those parts of the towns of Harmony and Turtle, which were then comprised in township 2, north of range 13 east, were set off and organized as a separate town. The west half of section 6 was subsequently set off to the city of Janesville. The first town meeting was held at the house of Justus P. Wheeler on the 3d day of April, 1849 ; whole number of votes cast at this meeting was fifty-six. The town officers selected were : Justus P.”
1908-brown-rock-county/31-smaller-cities-villages-towns.md, Vol. 2, PDF p. 183 / book p. 689
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 · may repeat 1879-history-of-rock-county, so not counted as independent
On the printed page (Vol. 2, PDF p. 183 / book p. 689) · open the whole page