what county.warren oh
Warren, OH. Online Offers. Warren is a city in the U.S. state of Ohio and the county seat of Trumbull County. The municipality is located in northeastern Ohio, approximately 14 miles (22 km) northwest of Youngstown and 15 miles (24 km) west of the Pennsylvania state line. The population was 46,832 at the 2000 census, but in 2005, the population was down to 45,796.