Hamilton Corner is an unincorporated community in Payette County, Idaho, United States, about 2.6 miles east-southeast of New Plymouth. The community is located at the junction of Idaho State Highway 52 and Idaho State Highway 72. However, the entire length of SH-72 was part of a former routing of U.S. Route 30. In addition, Sand Hollow Road, whic…Hamilton Corner is an unincorporated community in Payette County, Idaho, United States, about 2.6 miles east-southeast of New Plymouth. The community is located at the junction of Idaho State Highway 52 and Idaho State Highway 72. However, the entire length of SH-72 was part of a former routing of U.S. Route 30. In addition, Sand Hollow Road, which runs south from the community, was also part of the former routing of US 30.