Koshkonong (community), Wisconsin

Lake Koshkonong is a census-designated place (CDP) in the towns of Koshkonong and Sumner, Jefferson County, Wisconsin, United States. The population was 1,239 at the 2020 census. Lake Koshkonong is in the area.

Koshkonong Mounds is an unincorporated community located in the town of Koshkonong, Jefferson County, Wisconsin, United States. It was named for the prehistoric earthwork mounds built by an early indigenous people in the area. They were likely related to the Mississippian culture, which established settlements and constructed mounds from 1000-1500 CE throughout the areas of the Mississippi River and its tributaries. Archeological artifacts found in the settlements show widespread trading from settlements in the Great Lakes to present-day Illinois and the center of Cahokia, to other settlements in the present-day southeastern United States.

The Albert and Mary Shekey House is a historic house at W7526 Koshkonong Mounds Road in the town of Koshkonong, Wisconsin. The house was built in 1885 for Mary Shekey, the daughter of two of Jefferson County's first settlers, and her husband Albert, an engineer for the Chicago & North Western Railway. It provided close access to Lake Koshkonong and the Koshkonong Place hunting lodge; it is unknown if the Shekeys, who were Janesville residents before the house was built, lived in the house full-time or used it as a summer or rental home. The house has a Queen Anne design, a popular style of the late nineteenth century, though its architect and builder are unknown. Its design includes a projecting bay on the east side, an irregular cruciform roof with several hips and gables, ornamental brackets and a frieze board with carved circles below the eaves, and Dutch gables with wooden shingles within the gable ends.The house was added to the State Register of Historic Places in 2014 and to the National Register of Historic Places the following year.

Vinnie Ha Ha is an unincorporated community located in the town of Koshkonong, Jefferson County, Wisconsin, United States.

Lake Koshkonong is a naturally occurring lake that acts as a reservoir in southern Wisconsin. Its size was augmented by the creation of the Indianford Dam in 1932, making it one of the larger lakes in the state. The lake lies along the Rock River, with the river acting as both the primary inflow and the primary outflow for the lake. Lake Koshkonong begins 5.5 mi (8.9 km) downriver from Fort Atkinson, with the large majority of the lake located in southwestern Jefferson County. Small portions of the lake extend into southeastern Dane and northern Rock counties. After the creation of the Indianford Dam, which was built several miles down the Rock River from Lake Koshkonong, the lake has had a surface area measuring 10,460 acres (42.3 km2). It remains very shallow with an average depth of six feet (1.8 meters) and a maximum depth of seven feet (2.1 meters). The dam itself measures 13 feet (4.0 meters) high and with a length of 500 ft (150 m) at its crest. Maximum capacity of the reservoir is 107,000 acre⋅ft (132,000,000 m3). Both dam and reservoir are owned and operated by Rock County.

Blackhawk Island is an unincorporated community located in the towns of Koshkonong and Sumner, Jefferson County, Wisconsin, United States. Its best known longtime resident was the poet, Lorine Niedecker.

Carcajou is an unincorporated community located in the town of Sumner, Jefferson County, Wisconsin, United States.The word carcajou is Canadian French for "wolverine".

Milton House is a historic building located at 18 South Janesville Street in Milton, Wisconsin. It was a stop on the Underground Railroad, a network of people and places that facilitated the movements of escaped slaves. The building has been asserted to be the first grout building built in the United States; although that claim is dubious, the house's grout construction apparently was influential. The AIA Journal called it the "Oldest standing concrete structure of any consequence." It is also known for its hexagonal shape.

The Abram Allen House is a historic house with walls of grout, built about 1853 in Milton, Wisconsin. It was added to the National Register of Historic Places in 1978.

The Town of Milton is located in Rock County, Wisconsin, United States. The population was 3,100 at the 2020 census. The City of Milton is within the town, although it is politically independent. The unincorporated communities of Charlie Bluff, Coopers Shores, Mallwood, and Maple Beach are located in the town. The unincorporated communities of Koshkonong and Newville are also partially in the town.

Milton College was a private college located in Milton, Wisconsin. Founded in 1844 as the Milton Academy, it closed in 1982. Its campus is now part of the Milton Historic District.

Sumner is a town in Jefferson County, Wisconsin, United States. The population was 832 at the 2010 census. The census-designated place of Lake Koshkonong and the unincorporated communities of Busseyville, Carcajou, Glenn Oaks Beach, Koshkonong Manor, and North Shore are located within the town. The community of Blackhawk Island is located partially in the town.