Located on the north side of Oshkosh, near Lake Winnebago is the Winnebago County Fairgrounds. Since 1855, it has hosted the Winnebago County Fair, which celebrated its 150th anniversary in 2005. Year-round events are also held on the grounds. Address: 500 E County Road Y Oshkosh WI USA 54901 Send an Email 1 920 231-6002