[3] The county was created on March 1, 1818, and was named for General George Rogers Clark,[4] a hero of the American Revolution.29.1% of all households were made up of individuals, and 4.0% had someone living alone who was 65 years of age or older.[20] As of the 2010 United States census, there were 138,333 people, 55,244 households, and 36,906 families living in the county.26.00% of all households were made up of individuals, and 11.10% had someone living alone who was 65 years of age or older.[28] That same year, Dayton and Springfield were grouped together as the Dayton-Springfield Metropolitan Statistical Area.The new MSA consisted of four counties – Clark, Greene, Miami, and Montgomery.[29] This arrangement remained unchanged until 2003, when the MSA was split with Springfield's newly defined metropolitan area including only Clark County.In 2012, Mitt Romney won the county, but by only 523 votes out of 64,301 cast for president.[31] County Commissioners - (President) Melanie Flax Wilt (R), Rick Lohnes (R), and Lowell McGlothlin (R) Sheriff - Deb Burchett (R) Recorder - Nancy Pence (R) Treasurer - Pamela Littlejohn (R) Auditor - Hillary Hamilton (R) Prosecuting Attorney - Dan Driscoll (R) Coroner - Susan L. Brown, DO (D) Judicial Municipal Court Clerk of Courts - Sheila Rice (D) Judges - Valerie Wilt (R), Stephen A. Schumaker (R), Daniel Carey (R) Common Pleas Court Clerk of Courts - Melissa Tuttle (R) General Division - Judges Douglas Rastatter (R) and Brian Driscoll (R) Domestic Relations - Judge Thomas Capper (R) Juvenile Court - Judge Katrine M Lancaster (R) Probate - Judge Richard Carey (R) Public school districts include:[33]