Ono is an unincorporated community located in the towns of Salem and Union, Pierce County, Wisconsin, United States. Ono is located at the junction of U.S. Route 10 and County Highway CC 3.5 miles (5.6 km) west-northwest of Plum City. Ono is also commonly called Grange Hall because it was the location of the meeting hall for the local chapter of The National Grange of the Order of Patrons of Husbandry.