Hartford Township is one of the twenty-four townships of Trumbull County, Ohio, United States. The 2020 census found 1,861 people in the township.

Trumbull County is a county in the far northeast portion of the U.S. state of Ohio. As of the 2020 census, the population was 201,977. Its county seat and largest city is Warren, which developed industry along the Mahoning River. Trumbull County is part of the Youngstown–Warren, OH Metropolitan Statistical Area.