Menasha is a city in Calumet and Winnebago counties in the U.S. state of Wisconsin. The population was 18,268 at the 2020 census. Of this, 15,144 were in Winnebago County, and 2,209 were in Calumet County. The city is located mostly 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".