Niles is a city in Trumbull County, Ohio, United States. The city's population was 19,266 at the 2010 census. It is part of the Youngstown-Warren-Boardman, OH-PA Metropolitan Statistical Area.
Located in the nation's former industrial belt, the city's economy focused initially on iron manufacturing but later diversified to include steel and glass production. Niles was adversely affected by the decline of the manufacturing sector throughout the northern United States in the 1970s. Since then, Niles has adapted to become a retail hub for the northern Mahoning Valley, with development centered around the Eastwood Mall complex.
The Mahoning Valley Scrappers of Minor League Baseball play at Eastwood Field in Niles.
Niles was founded in 1806 by James Heaton, who owned one of the first iron-ore processing plants in Ohio. The town originally went by the name of Heaton's Furnace but was later renamed Nilestown, after Hezekiah Niles (editor of the Niles Register, a Baltimore newspaper). In 1843, the name was shortened to Niles.