Mount Vernon is a city in and the county seat of Posey County, Indiana, United States. Located in the state's far southwestern corner, within of both the southernmost or westernmost points, it is the westernmost city in the state. The southernmost is Rockport, located along the Ohio River about to the southeast. The population was 6,687 at the 2010 census. It is located in Black Township and is part of the Evansville, Indiana, metropolitan area, which had a 2010 population of 358,676. Geography Mount Vernon is located at (37.936766, -87.898780). According to the 2010 census, Mount Vernon has a total area of , of which (or 98.25%) is land and (or 1.75%) is water. Climate The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Mount Vernon has a humid subtropical climate, abbreviated "Cfa" on climate maps. History Mount Vernon is the county seat and largest city in Posey County, named for General Thomas Posey, Governor of the Indiana Territory. He grew up at a plantation adjacent to George Washington's Mount Vernon. He was widely rumored to be Washington's illegitimate son, but this was dismissed by Posey's biographer, John Thornton Posey, a descendant. The first settler in Mount Vernon was Andrew McFaden in 1806, and the settlement was called McFaden's Bluff. It was platted as Mount Vernon in 1816, but continued to be known as McFadden's Bluff for some time. It was named in honor of Washington's Mount Vernon. A post office called Mount Vernon has been in operation since 1818. A number of historic sites have been recognized in Mount Vernon, including the Posey County Courthouse Square, Mount Vernon Downtown Historic District, Welborn Historic District and the William Gonnerman House, all of which have been placed on the National Register of Historic Places. Demographics 2010 census As of the census of 2010, there were 6,687 people, 2,736 households, and 1,819 families residing in the city. The population density was . There were 3,077 housing units at an average density of . The racial makeup of the city was 93.4% White, 2.8% African American, 0.3% Native American, 0.4% Asian, 0.8% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 1.7% of the population. There were 2,736 households, of which 32.0% had children under the age of 18 living