La Prairie Grange Hall No. 79, also known as the La Prairie Town Hall, is a historic two-story wooden Grange hall built in 1874 in La Prairie, Rock County, Wisconsin. One of the oldest remaining Grange halls in the U.S., it was listed on the National Register of Historic Places in 1977. Ever since, the local Grange has been a social center in La Prairie, hosting card parties, dancing, church services, educational events, and meetings. In 1960, the town relinquished its ownership interest in the property, but continues to share its use with the Grange, which uses it as its meeting place.