Mahoning County
Also known as Mahoning County, Ohio, Mahoning County, OH
county in Ohio, United States
Key facts
- Country
- United States
- State
- Ohio
- Founded
- March 1, 1846
- Named after
- A Native American word for salt lick
- Seat
- Youngstown
- Largest city
- Youngstown
- Total
- 425 sq mi (1,100 km )
- Land
- 412 sq mi (1,070 km )
- Water
- 14 sq mi (36 km ) 3.2%
- Estimate 2025
- 224,706
- Density
- 555/sq mi (214/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
Article
Mahoning County is located 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. Mahoning County is part of the Youngstown–Warren, OH Metropolitan Statistical Area.