The region Northeast Ohio, in the US state of Ohio, in its most expansive usage contains six metropolitan statistical areas: Cleveland–Elyria, Akron, Canton–Massillon, Youngstown–Warren, Mansfield, and Weirton–Steubenville along with eight micropolitan statistical areas. Most of the region is considered either part of the Cleveland–Akron–Canton, OH Combined Statistical Area and media market or the Youngstown–Warren, OH–PA Combined Statistical Area and media market. In all, the region is home to: 4,502,460 residents. It is also a part of the Great Lakes megalopolis, containing over 54 million people. Northeast Ohio also includes most of the area known historically as the Connecticut Western Reserve.

Richland County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 124,936. Its county seat is Mansfield. The county was created in 1808 and later organized in 1813. It is named for the fertile soil found there. Richland County is included in the Mansfield, OH Metropolitan Statistical Area as well as the Mansfield-Ashland-Bucyrus, OH Combined Statistical Area. The county is one of the six Metropolitan Statistical Areas that make up Northeast Ohio.