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Warren County, Ohio

Warren County, Ohio
Seal of Warren County, Ohio
Seal
Map of Ohio highlighting Warren County
Location in the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location in the U.S.
Founded May 1, 1803
Named for Dr. Joseph Warren
Seat Lebanon
Largest city Mason
Area
 • Total 407 sq mi (1,054 km2)
 • Land 401 sq mi (1,039 km2)
 • Water 6.0 sq mi (16 km2), 1.5%
Population
 • (2010) 212,693
 • Density 530/sq mi (205/km²)
Congressional district 1st
Time zone Eastern: UTC-5/-4
Website www.co.warren.oh.us

Warren County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 212,693. Its county seat is Lebanon. The county was erected on May 1, 1803 from Hamilton County and named for Dr. Joseph Warren, a hero of the Revolution who sent Paul Revere on his ride and who died at the Battle of Bunker Hill.

Warren County is part of the Cincinnati-Middletown, OH-KY-IN Metropolitan Statistical Area. Along with Butler County, Warren County comprises the geographical center of the Cincinnati-Dayton Metropolitan Region, which is home to approximately 3.3 million and is the 14th most populous in the United States. This is the key factor to the county's rapid suburban growth.

According to the U.S. Census Bureau, the county has a total area of 407 square miles (1,050 km2), of which 401 square miles (1,040 km2) is land and 6.0 square miles (16 km2) (1.5%) is water. The county is a rough square with the sides roughly 20 miles (30 km) long.

Warren County was created by the first Ohio General Assembly in the Act of March 24, 1803, which also created Butler and Montgomery Counties. The act defined Warren County as "all that part of the county of Hamilton included within the following bounds, viz.: Beginning at the northeast corner of the county of Clermont, running thence west with the line of said county to the Little Miami; thence up the same with the meanders thereof to the north boundary of the first tier of sections in the second entire range of townships in the Miami Purchase; thence west to the northeast corner of Section No. 7 in the third township of the aforesaid range; thence north to the Great Miami; thence up the same to the middle of the fifth range of townships; thence east to the County line; thence with same south to the place of beginning." Originally this included land now in Clinton County as far east as Wilmington.


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