Mahoning County is a county in the U.S. state of Ohio. As of the 2020 census, the population was 228,614. Its county seat and largest city is Youngstown. The county is named after the Mahoning River and was formed on March 1, 1846; the 83rd county in Ohio. Present-day Mahoning County was part of Trumbull and Columbiana counties until 1846, when the counties were redefined and Mahoning County was established as a new county.
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