Campbell is a city in eastern Mahoning County, Ohio, United States, along the Mahoning River. The population was 7,852 at the 2020 census. Located directly southeast of Youngstown, it is a suburb of the Youngstown–Warren metropolitan area. Campbell was first called East Youngstown and this designation still appears on real estate deeds between 1902 and 1926, when the city was renamed for local industrialist James Campbell, then chairman of the Youngstown Sheet and Tube Company.