Oshkosh YMCA 20th Ave. Location Location 3303 W. 20th Ave.OshkoshWI54904 Next Event 4th Annual Oshkosh Century - Jun 22 - 7:00 am - 4:00 pm Loading Map.... Oshkosh YMCA 20th Ave. Location3303 W. 20th Ave. - OshkoshEvents 43.994859 -88.616812 Upcoming Events 4th Annual Oshkosh Century - Jun 22 - 7:00 am - 4:00 pm