Warren County is a county located in the southwestern part of the U.S. state of Ohio. As of the 2020 census, the population was 242,337. Its county seat is Lebanon and largest city is Mason. The county is one of Ohio's most affluent, with the highest median income of the state's 88 counties. The county was established on May 1, 1803, from Hamilton County; it is named for Dr. Joseph Warren, a hero of the Revolution who sent Paul Revere and the overlooked William Dawes on their famous rides and who died at the Battle of Bunker Hill. Warren County is part of the Cincinnati, OH-KY-IN Metropolitan Statistical Area.

Founded: May 1, 1803
Named for: Dr. Joseph Warren
Seat: Lebanon
Largest city: Mason
Total: 407 sq mi (1,054.13 km²)
Land: 401 sq mi (1,038.59 km²)
Water: 6 sq mi (15.54 km²), 1.5%
Density: auto/sq mi (/km²)
Time zone: Eastern: UTC-5-4
Website: [www.co.warren.oh.us]
Official Website: http://www.co.warren.oh.us
Wikidata description: county in Ohio, United States
Wikidata id: Q489576
Wikidata label: Warren County
Wikidata aliases: Array
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