State Route 542 is a state highway in western Carroll County, within the eastern side of Ohio. The route runs 15.8 miles (25.4 km) long and connects SR 212 near Sherrodsville to Magnolia at SR 183 by way of Dellroy and Atwood Lake.

Carroll County is a county located in the state of Ohio. As of the 2020 census, the population was 26,721. Its county seat is Carrollton, while its largest village is Minerva. It is named for Charles Carroll of Carrollton, the last surviving signer of the Declaration of Independence. Carroll County is part of the Canton-Massillon, OH Metropolitan Statistical Area, which is also included in the Cleveland-Akron-Canton, OH Combined Statistical Area. It is in the Appalachian Ohio region.