County # 50
Explore our record of Mahoning County's markers through our notes, map, and photos.
Mahoning County was founded in 1846. It was carved out of parts of Columbiana and Trumbull Counties, and was named for the Native American word for “salt licks”. Canfield was the county seat until a decision by the Supreme Court moved the seat to Youngstown in 1876. In 1803 the Heaton brothers built the first iron blast furnace in Ohio. This began a long and intense period of industrialization.