Menasha is a city in Calumet and Winnebago Counties in the U.S. state of Wisconsin. The population was 16,331 at the 2000 census. The city is located mostly in the Town of Menasha in Winnebago County; only a small portion is in the Town of Harrison in Calumet County. Doty Island is located partially in Menasha. The city's name comes from the Winnebago word meaning "thorn" or "island". Menasha is home to the Barlow Planetarium and Weis Earth Science Museum, both housed at the University of Wisconsin-Fox Valley.