Denoon, DeNoon or De Noon was a village established by James DeNoon Reymert in 1852, straddling the county line between Waukesha County, Wisconsin, and Racine counties, 15 miles southeast of Waukesha, in range 20 E. of the towns of Muskego and Norway, on the shore of Lake Denoon. It was on the plank road between Milwaukee and Rochester, which Reymert is generally credited with getting built.
In a gazetteer published in 1853, it was described as having a population of about 100, including dwellings, a store, a hotel, a Lutheran church, and "several mechanical shops". It was depopulated as the result of a cholera epidemic in the 1850s.
- "Muskego Township, Muskego Lake, Denoon Lake" (Map). Atlas of Waukesha Co. Wisconsin. Madison: Harrison and Warner. 1873.
- The Diary of Søren Bache, 1839-1847 (translated and edited by C. A. Clausen (Norwegian-American Historical Association. 1951. XV: Page 77) 
- Sons of Norway gather to mark newspaper birth (Milwaukee Sentinel Muskego, Wisconsin. July 29, 1917 
- Hunt, John Warren. Wisconsin Gazetteer: Containing the Names, Location, and Advantages, of the Counties, Cities, Towns, Villages, Post Offices, and Settlements, Together with a Description of the Lakes, Water Courses, Prairies, and Public Localities, in the State of Wisconsin, Alphabetically Arranged Madison: Beriah Brown, printer, 1853; p. 76