Ohio County Map & State Guide
Ohio has 88 counties. Use the labeled map below to find county boundaries and names. This state hub brings together county geography and our published Ohio guides.
State Capital County-level areas Ohio Columbus 88 counties
Ohio County Map
U.S. Census Bureau TIGERweb county boundaries, January 1, 2026 vintage. Colors distinguish areas; they do not represent population. Ohio State Articles
Explore Ohio county boundaries, county seats and 2020 Census population counts, with a labeled map and a full alphabetical county list.
Read the state guide
County Names
Adams County Allen County Ashland County Ashtabula County Athens County Auglaize County Belmont County Brown County Butler County Carroll County Champaign County Clark County Clermont County Clinton County Columbiana County Coshocton County Crawford County Cuyahoga County Darke County Defiance County Delaware County Erie County Fairfield County Fayette County Franklin County Fulton County Gallia County Geauga County Greene County Guernsey County Hamilton County Hancock County Hardin County Harrison County Henry County Highland County Hocking County Holmes County Huron County Jackson County Jefferson County Knox County Lake County Lawrence County Licking County Logan County Lorain County Lucas County Madison County Mahoning County Marion County Medina County Meigs County Mercer County Miami County Monroe County Montgomery County Morgan County Morrow County Muskingum County Noble County Ottawa County Paulding County Perry County Pickaway County Pike County Portage County Preble County Putnam County Richland County Ross County Sandusky County Scioto County Seneca County Shelby County Stark County Summit County Trumbull County Tuscarawas County Union County Van Wert County Vinton County Warren County Washington County Wayne County Williams County Wood County Wyandot County Boundary source: U.S. Census Bureau TIGERweb , January 1, 2026 vintage. This generalized map is for geographic reference. Browse all state maps .
