Oshkosh is a city in Winnebago County, Wisconsin, United States, and its county seat. It is located on the western shore of Lake Winnebago, adjacent to the much less populous Town of Oshkosh in the north. The population was 66,816 at the 2020 census, making it the ninth-most populous city in Wisconsin. The Oshkosh metropolitan statistical area, consisting solely of Winnebago County, had 171,730 residents. Oshkosh is included in the greater Fox Cities region of Wisconsin.