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.
Trumbull County is a county in the far northeast portion of the U.S. state of Ohio. As of the 2020 censu.s, 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