Newton Falls is a city located within Newton Township in Trumbull County, Ohio in the United States. The population was 5,002 at the 2000 census. It is part of the Youngstown-Warren-Boardman, OH-PA Metropolitan Statistical Area. The city is known for its ZIP code, which is 44444, and for its covered bridge, which is the second oldest in the state of Ohio and the only one in Ohio with an integrated covered walkway. The city earned its name from the two sets of falls within the city, each on different branches of the Mahoning River.