Lincoln Heights is an unincorporated area and census-designated place in Richland County, Ohio, United States. It was first listed as a CDP prior to the 2020 census. The CDP is in east-central Richland County, in the center of the east part of Madison Township. It is bordered to the west by the city of Mansfield, to the east by unincorporated Wooster Heights and to the southwest by unincorporated East Mansfield. U.S. Route 42 forms the northwestern edge of the CDP. Route 42 leads northeast 11 miles to Ashland and southwest 2 miles to the center of Mansfield.