<page_title> List of counties in Ohio </page_title> <section_title> List of counties </section_title> <table> <cell> Mercer County <col_header> County </col_header> <col_header> Adams County </col_header> <col_header> Allen County </col_header> <col_header> Ashland County </col_header> <col_header> Ashtabula County </col_header> <col_header> Athens County </col_header> <col_header> Auglaize County </col_header> <col_header> Belmont County </col_header> <col_header> Brown County </col_header> <col_header> Butler County </col_header> <col_header> Carroll County </col_header> <col_header> Champaign County </col_header> <col_header> Clark County </col_header> <col_header> Clermont County </col_header> <col_header> Clinton County </col_header> <col_header> Columbiana County </col_header> <col_header> Coshocton County </col_header> <col_header> Crawford County </col_header> <col_header> Cuyahoga County </col_header> <col_header> Darke County </col_header> <col_header> Defiance County </col_header> <col_header> Delaware County </col_header> <col_header> Erie County </col_header> <col_header> Fairfield County </col_header> <col_header> Fayette County </col_header> <col_header> Franklin County </col_header> <col_header> Fulton County </col_header> <col_header> Gallia County </col_header> <col_header> Geauga County </col_header> <col_header> Greene County </col_header> <col_header> Guernsey County </col_header> <col_header> Hamilton County </col_header> <col_header> Hancock County </col_header> <col_header> Hardin County </col_header> <col_header> Harrison County </col_header> <col_header> Henry County </col_header> <col_header> Highland County </col_header> <col_header> Hocking County </col_header> <col_header> Holmes County </col_header> <col_header> Huron County </col_header> <col_header> Jackson County </col_header> <col_header> Jefferson County </col_header> <col_header> Knox County </col_header> <col_header> Lake County </col_header> <col_header> Lawrence County </col_header> <col_header> Licking County </col_header> <col_header> Logan County </col_header> <col_header> Lorain County </col_header> <col_header> Lucas County </col_header> <col_header> Madison County </col_header> <col_header> Mahoning County </col_header> <col_header> Marion County </col_header> <col_header> Medina County </col_header> <col_header> Meigs County </col_header> </cell> <cell> General Hugh Mercer (1726–1777), a Revolutionary War officer <col_header> Etymology </col_header> <row_header> Mercer County </row_header> </cell> </table>
Mercer County is named after Hugh Mercer, an officer in the Revolutionary War.