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County in Ohio, United States

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.

Warren County was established in 1803. The first non Native American settlers were migrants from New England. During the election of 1860 Abraham Lincoln received 60% of the vote in Warren County, and in 1864 he was reelected with 70% of the vote in the county. From that time on the county was a stronghold of the Republican party, with Ulysses S. Grant going on to carry the county by large margins in both 1868 and 1872.

According to the United States Census Bureau, the county has a total area of 407 square miles (1,054 km2), of which 401 square miles (1,039 km2) is land and 6.0 square miles (16 km2) (1.5%) is water. The county is a rough square with the sides about 20 mile (32 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. Clinton County proved a continuing headache to the legislature. The Ohio Constitution requires that every county have an area of at least four hundred square miles (1,036 km2). Clinton County's boundaries were several times adjusted in an effort to comply with that clause of the constitution. One of them, the Act of January 30, 1815, detached a strip of land from the eastern side to give to Clinton. That would have left Warren under four hundred square miles (1,036 km2), so a portion of Butler County (the part of Franklin Township where Carlisle is now located) was attached to Warren in compensation. The 1815 act was as follows:
Section 1—That all that part of the county of Butler lying and being within the first and second fractional townships in the fifth range, and adjoining the south line of Montgomery County, shall be and the same is hereby attached to and made part of the county of Warren. Section 2—That eleven square miles 28 km2 of the territory of the county of Warren and extending parallel to the said eastern boundary of Warren County, along the whole length of such eastern boundary from north to south, shall be and the same is hereby attached to and made a part of the county of Clinton." Except for the sections formed by the Great and Little Miamis, the sides are all straight lines.

The major rivers of the county are the Great Miami River, which flows through the northwest corner of the county in Franklin Township, and the Little Miami River which zig zags across the county from north to south. There is one sizable lake, the Caesars Creek Reservoir, created by a U. S. Army Corps of Engineers dam on Caesars Creek in the northeast part of the county in Massie Township.

As of the 2010 United States Census, there were 212,693 people, 76,424 households, and 57,621 families residing in the county. The population density was There were 80,750 housing units at an average density of The racial makeup of the county was 90.5% white, 3.9% Asian, 3.3% black or African American, 0.2% American Indian, 0.7% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 2.2% of the population. Of the 76,424 households, 40.1% had children under the age of 18 living with them, 62.6% were married couples living together, 8.8% had a female householder with no husband present, 24.6% were non families, and 20.4% of all households were made up of individuals. The average household size was 2.70 and the average family size was 3.14. The median age was 37.8 years.

Warren County is home to the Mason Business Center, a research and development facility for Procter and Gamble (P&G), whose global headquarters are located in downtown Cincinnati. Originally built in 1995 after three years of construction, P&G recently completed expansion of a new Beauty and Innovation Center in 2019, adding an additional 1,000 jobs for a total of 2,800 employees at the site. Mason is also home to the corporate headquarters of LensCrafters.

Warren County has a 3 member Board of County Commissioners that administer and oversee the various County departments, similar to all but 2 of the 88 Ohio counties. The original county commissioners in 1804 were Robert Benham, Matthias Corwin and William James. The elected commissioners now serve four year terms. Warren County's current elected commissioners are:
County Commissioners: Tom Grossmann (R), Shannon Jones (R), and David Young (R).

Warren County has no native colleges or universities, but was the original site selected for Miami University which instead located in Oxford, Ohio in 1809. National Normal University, a teachers college, was in Lebanon from 1855 until 1917 when it closed. Several colleges offer classes in Warren County at various locations, including Sinclair Community College of Dayton, the University of Cincinnati, and Wilmington College. Sinclair opened a branch in the Mason area in 2007. The University of Cincinnati owns of land at the intersections of I 71 and Wilmington road, but no plans for development on the site have been announced.

Warren County has one public airport, designated as Lebanon Warren County Airport (I68). The runway is a 4502' x 65' paved and lighted north–south runway (01/19), and parallel taxiway. Navigation and communications equipment includes PAPI, AWOS, Pilot Controlled Lighting, and UNICOM. The airport runway, taxiway, and navigation equipment is owned by the county. The county leases a public terminal, but other facilities are privately owned and operated under contract by a Fixed base operator. The airport serves general and business aviation, but has no commercial airlines. There are also two privately owned operating airports in the county; Waynesville airport, also known as Red Stewart Field (40I), and Caesar Creek Gliderport (2OH9), both with grass runways. Operations have ceased at two former private paved runway airports, Brownie's Lebanon Airport (19I), and Lebanon San Mar Gale (OH79).

Warren County does not have passenger train service except for a scenic train that runs between Lebanon and Mason. Freight trains still serve Carlisle, and on a limited basis, Monroe, Mason, and Lebanon. Historically, there have been several trains that ran through the county whose stops became cities and villages. These trains include the Cincinnati, Lebanon and Northern Railway, the Middletown and Cincinnati Railroad, and the Little Miami Railroad whose path is now replaced by the Little Miami Bike Trail. There have been proposals to run commuter trains from Cincinnati to the Kings Island area, but none have ever found sufficient support or funding. There is no public bus transportation based in Warren County, but there is limited service from Cincinnati to Mason and Kings Island. Middletown also runs bus service to eastern portions of Middletown that are in Warren County.

There are no commercially navigable waterways in Warren County, but the Warren County Canal did operate in the 19th century as a branch of the Miami and Erie Canal, bringing freight to Lebanon by canal boat. Recreationally, the Little Miami River can be traveled by canoe or kayak for its length through the county, and motorized boating can be done at Caesar's Creek Lake.

The Journal News circulates in Franklin, Springboro, Lebanon, and Turtlecreek Township. The Dayton Daily News, circulates in the northern part of the county. The Cincinnati Enquirer circulates through most of the county while the Cincinnati Post abandoned all distribution in the county in 2004. Among its weekly papers was The Western Star, the oldest weekly in the state and the oldest newspaper west of the Appalachians published under its original name. It was closed on January 17, 2013. The Star, like the Pulse Journal in Mason and the Star Press in Springboro, was owned by the parent of the Middletown Journal and the Dayton Daily News, Cox Media Group. Other weeklies include the Franklin Chronicle. For a time in the mid 1990s, Lebanon was the home of commercial radio station WMMA FM, begun by Mike and Marilyn McMurray in 1994. The McMurrays sold to what was then known as American Radio Systems License Corp. a Boston based chain of stations which also owned Cincinnati stations WGRR FM and WKRQ (both since sold to various other owners). The new owners moved the station to Hamilton County. In 2010, the only radio station in the county at the time was WLMH FM, a student run station at Little Miami High School in Hamilton Township. It went off the air around 2010, and in 2012, the FCC removed WLMH from their database and cancelled their license as a result of no broadcasts for over a year. Warren County is assigned to the Cincinnati television market, but Dayton television stations treat it as part of their market as well.