Neenah is a city in Winnebago County, Wisconsin, United States. It is situated on the banks of Lake Winnebago, Little Lake Butte des Mort…Neenah is a city in Winnebago County, Wisconsin, United States. It is situated on the banks of Lake Winnebago, Little Lake Butte des Morts, and the Fox River approximately forty miles southwest of Green Bay. Neenah's population was 27,319 at the 2020 census.